Chemistry Sem B2

A calorimeter is used to measure the combustion of 14.0 grams of H2 gas under 150. grams of water. The energy measured using the water was 10,432 J. What is the heat lost or gained by the total reaction?

-1.49 kJ/mol

Energy from a reaction was determined to be 11563 J, when burning 15.0 grams of H2. What is the total enthalpy of the reaction?

-1.54 kJ/mole

A 2.50 gram sample of CH4 is burned in a calorimeter. The calorimeter is filled with 100.0 grams of water. The temperature of a calorimeter increases from 20.0°C to 30.0 C. Calculate the energy lost or gained by the reaction in kJ per mole.

-26.8 kJ/mole

A calorimeter is used to measure the combustion of 8.00 grams of H2 gas under 75.0 grams of water. The energy measured using the water was 15,400 J. What is the heat lost or gained by the total reaction?

-3.85 kJ/mol

The initial temperature of water is 30.0 °C, and the final temperature is 25.0 °C. What is the change in temperature of the water.

-5.0 °C

A necklace is found to have 5.43 x 1019 atoms of gold, Au. How many grams of gold are in the necklace?

0.0178 g Au

How many moles of gas are held in a container with a volume of 780.0 mL at a temperature of 90.0 °C, and a pressure of 0.7105 atm?

0.0186 mol

How many moles are in 3.2 x 1022 particles of K2CO3?

0.053 mol

How many moles of gaseous boron trifluoride, BF3, are contained in a 4.3410-L bulb at 788 K if the pressure is 1.22 atm?

0.082 M

How many moles will be needed if a chemist is trying to create 15.5 grams of K2SO4?

0.0890 mol

The reaction between lead (II) nitrate and potassium iodide produces a bright yellow precipitate according to the following reaction: Pb(NO3)2 + 2KI ⟶ 2KNO3 + PbI2 How many moles of PbI2 will be produced if 0.321 moles of KI are entirely used during the reaction?

0.161 mol

You want to make a concentration of 3.00 M KCl and you only have 71.2 g of KCl. How much water do you need to add to make the solution?

0.318 L

Fireworks often contain magnesium due to the bright light produced by burning this soft metal. This happens according to the following reaction: 2Mg + O2 ⟶ 2MgO How many moles of MgO will be produced if a firework that contains 0.456 mol of Mg explodes?

0.456 mol

Convert 22.1 grams of CO2 into moles.

0.500 moles

Convert 28.1 grams of CO2 into moles.

0.639 moles

A balloon that is 100.21 L at 21.0 °C and 0.981 atm is released and just barely clears the top of Mount Crumpet in British Columbia. If the final volume of the balloon is 144.53 L at a temperature of 5.24 °C, what is the pressure in atm experienced by the balloon as it clears Mount Crumpet?

0.664 atm

What concentration will a solution have if 0.286 moles of solid is added to 316 mL of water?

0.905 M

What are the coefficients for the equation below when it is correctly balanced? NaHCO3 + HC2H3O2 ⟶NaC2H3O2 + CO2 + H2O

1, 1, 1, 1, 1

Balance the following equation: C2H4 + O2 --> CO2 + H2O

1, 1, 2, 2

What are the coefficients for the equation below when it is correctly balanced? Ca(OH)2 + HCl ⟶ CaCl2 + H2O

1, 2, 1, 2

Balance the following equation by filling in the blanks. H2SO4 + NaOH ⟶ H2O + Na2SO4

1, 2, 2, 1

How many moles are in 6.24 x 10^32 molecules of methane (CH4)?

1.04 x 10^9 mol

For the following reaction, how many liters of oxygen (O2) gas are produced from the decomposition of 22.1 grams of mercuric oxide (HgO) at STP? 2 HgO (s) ⟶ 2 Hg (l) + O2 (g)

1.14 L

Convert 22.3 grams of CH4 into moles of CH4.

1.39 moles

How many grams are in 0.0430 moles of carbon dioxide, CO2?

1.89 g

How many moles are in 34.4 g of water, H2O?

1.91 mol

A standard lighter operates through the combustion of butane according to the reaction: 2C4H10 + 13O2 ⟶ 8CO2 + 10H2O How many grams of O2 are required to combust 0.534 grams of C4H10?

1.94 g

The decomposition of potassium chlorate (KClO3) is a relatively simple method by which to isolate oxygen gas (O2). How many grams of oxygen gas can be isolated from the decomposition of 2.12 moles of potassium chlorate according to the equation: 2KClO3⟶2KCl + 3O2

102 g

Use the following equation to answer the question: 2NaF + Cl2 ⟶ 2NaCl + F2. If Xander is working in the lab and produce 6.25 moles of fluorine gas, how many moles of sodium chloride was also produced during this reaction?

12.5 mol NaCl

A reaction heats up 50.0 grams of water from 22.0 °C, to 28.0 °C. Water has a specific heat of 4.184. How much energy was released?

1260 J

A jewelry factory has 1.23 moles of excess silver from the creation of a new bracelet. What is the mass of this excess silver?

133 g

4Al + 3O2 ⟶ 2Al2O3 How many moles of aluminum, Al would be needed if Susan is looking to use all of the 13.23 moles of oxygen, O2 available in the oxygen tank in the lab?

17.64 mol Al

A tank holding 72.4 moles of helium gas at 42.0 °C has a pressure of 1.0526 atm. How big is the tank in liters?

1780 L

The reaction between copper and silver nitrate produces beautiful silver flakes and a bright blue copper (II) nitrate solution according to the following reaction: Cu + 2AgNO3 ⟶ 2Ag + Cu(NO3)2 What is the ratio of moles of Cu metal required to moles of Ag produced by this reaction?

1:2

What is the ratio of chlorine gas to sodium chloride according to the following reaction: 2NaF + Cl2 ⟶2NaCl + F2

1:2

Calcium carbonate (CaCO3) is a common ingredient in antacids. It works by neutralizing the hydrochloric acid in your stomach according to the following reaction:CaCO3+ 2HCl ⟶ CaCl2 + H2O + CO2 What is the mole ratio of HCl neutralized to H2O produced?

2 : 1

Balance the following equation ___Mg + ___O2 -->___MgO

2,1,2

How many particles are in 0.00345 moles of CaCl2?

2.08 x 10^21 particles

What is the original concentration of a 0.335 L solution if water was added to the mixture to make 1.34 L of a 0.546 M solution?

2.18 M

How many atoms of silver are in a ring with a mass of 4.5 grams?

2.5 x 10^22 atoms

Zinc metal reacts very quickly with hydrochloric acid to produce zinc chloride and hydrogen gas according to the equation: Zn + 2HCl ⟶ZnCl2 + H2 If 1.25 moles of Zn reacts with 3.00 moles of HCl, what is the theoretical yield of H2 for the reaction?

2.52 g

A sample of oxygen, O2, occupies 32.2 mL at 30 °C and 452 torr. What volume will it occupy at -70 °C and the same pressure?

21.6ml

A 30-cm balloon is held at a constant temperature and pressure, and contains 29.4 moles of gas and occupies 14 L of space. If 17.9 moles of gas are released from the balloon, what will be its new volume in L?

23.0 L

A tank holding 4.00 moles of helium gas at 77.0 °C has a pressure of 4.20 atm. How big is the tank in liters?

27.4 L

In order to convert a temperature from degrees Celsius to degrees Kelvin, one must add _____ to the Celsius temperature.

273

The values chemists use for standard temperature and pressure are 273 degrees Kelvin and 1 atm.

273 1

What is the freezing point of water in degrees Kelvin?

273 Kelvin

A 433 L tank holds helium gas at -48.0 °C with a pressure of 939 torr. How many moles of gas are in the tank?

29.1 mol

What is the correct coefficient for O2 when the following equation is correctly balanced? Al2O3 \longrightarrow⟶ Al + O2

3

Balance the following equation by filling in the blanks. MgBr2 + Fe3P2 ⟶ Mg3P2 + FeBr2

3 MgBr2 + Fe3P2 ⟶ Mg3P2 + 3 FeBr2

How many grams of NaCl must be added to 100. mL of water to make a 0.550 M solution?

3.21 grams

What volume of hydrogen gas at STP may be prepared by the reaction of 7.62 g gallium (Ga) with an excess of hydrochloric acid (HCl)? Use the following reaction to find your answer: 2 Ga (s) + 6 HCl (aq) ⟶ 2 GaCl3 (aq) + 3 H2 (g)

3.67 L

Lithium hydroxide is frequently used to neutralize sulfuric acid according to the equation: 2LiOH + H2SO4 ⟶ 2H2O + Li2SO4. If 5.6 g of LiOH reacts with 10.2 grams of H2SO4, what is the theoretical yield of water in this reaction? (In other words, how much water do you expect to produce?)

3.7 g H2O

The reaction between lead (II) nitrate and potassium iodide produces a bright yellow precipitate according to the following reaction: Pb(NO3)2 + 2KI ⟶ 2KNO3 + PbI2 How many grams of KNO3 will be produced if 0.321 moles of KI are entirely used during the reaction?

32.5 g

How much water needs to be added to 12 mL of a 5.1 M solution to make a 1.3 M solution?

35 mL

How many grams of KClO3 would Mark need if he is looking to isolate 155 grams of O2? 2KClO3 ⟶2KCl + 3O2

396 g

4Al + 3O2 ⟶ 2Al2O3 How many moles of oxygen, O2 would be needed if Luis is looking to produce 2.75 moles of aluminum oxide, Al2O3?

4.13 mol O2

Nitrogen gas is held in container of 3.6 liters at 910 mmHg. If we want to change the pressure to an atmospheric pressure of 760 mmHg, we would need a container with what volume in L?

4.3L

A sample of nitrogen, N2, occupies 45.0 mL at 27 °C and 600 torr. What pressure will it have in torr if cooled to -73 °C while the volume remains constant?

400 torr

A pocket of hydrogen gas near the surface of a dwarf star flashes into existence for a moment, and contains 17530 moles of gas at a pressure of 2832 atm and a volume of 2200. L. What is the temperature of the gas pocket in Kelvin?

4329 K

If 53.5 g of C3H8 are burned in the presence of 15.0 g of oxygen to produce 23.3 g of CO2, how many grams of water will be produced? C3H8 + O2 ⟶ CO2 + H2O

45.2 g

Calcium carbonate (CaCO3) is a common ingredient found in antacids. What is the percentage of oxygen?

48.0 %

What is the correct coefficient for O2 when the following equation is correctly balanced? C3H8 + O2 ⟶ CO2 + H2O

5

What is the pH of a substance that has an [H+] = 1.27 · 10-6 M?

5.9

A cylinder of medical oxygen has a volume of 35.4 L, and contains O2 at a pressure of 151 atm and a temperature of 25.0 °C. What volume in L of O2 does this correspond to at normal body conditions, that is, 1.00 atm and 37.0 °C?

5561 L

A 24.4 L tank holds 56.8 moles of helium gas at 297 K. Calculate the pressure of the tank in atm.

56.7 atm

What is the volume in mL of a sample of ethane at 467 K and 1.1 atm if it occupies 405 mL at 298 K and 1.1 atm?

635ml

The most common form of rust is iron (III) oxide. The formula for rust is Fe2O3. What percent of composition of iron in rust?

69.9%

If the reaction below begins with 5 grams of magnesium and produces 12 g of magnesium oxide, how much oxygen was used in the reaction? ____Mg + ____O2 --> ____MgO

7 g

Fireworks often contain magnesium due to the bright light produced by burning this soft metal. This happens according to the following reaction: 2Mg + O2 ⟶ 2MgO How many grams of O2 will be used if a firework that contains 0.456 mol of Mg explodes?

7.30 g

Convert 7593 J into kJ.

7.593

An unknown mass of water is heated from 24.0 °C to 35.0 °C. Water has a specific heat capacity of 4.184. If 353 J are absorbed by the water during the heating, what is the mass of the water?

7.67 mL of water

A standard lighter operates through the combustion of butane according to the reaction: 2C4H10 + 13O2 ⟶ 8CO2 + 10H2O How many grams of H2O are produced by the combustion of 0.789 mol of C4H10?

71.1 g

What volume of nitric oxide (NO) can be produced from the complete reaction of 54.6 grams of ammonia (NH3) gas at STP? 4 NH3 (g) + 5 O2 (g) ⟶ 4 NO (g) + 6 H2O (g)

71.9 L

The percent of carbon in methane (CH4) is ____

74.9

Lithium hydroxide is frequently used to neutralize sulfuric acid according to the equation: 2LiOH + H2SO4 ⟶ 2H2O + Li2SO4. Marcus runs this reaction with 5.6 g of LiOH and 10.2 grams of H2SO4. What is the percent yield of this reaction if Marcus is able to produce 2.8 g of H2O?

76%

A 0.50-L container is filled with hydrogen gas at STP. Calculate the change in temperature in Kelvin when the container is crushed by the vacuum of space to 0.070 L and 20.0 atm.

764 K

Zinc metal reacts very quickly with hydrochloric acid to produce zinc chloride and hydrogen gas according to the equation: Zn + 2HCl → ZnCl2 + H2 If 1.25 moles of Zn reacts with 3.00 moles of HCl and produces 2.00 g of H2, what is the percent yield for this reaction?

79.4%

The initial temperature of water is 15.0 °C, and the final temperature is 23.0 °C. What is the change in temperature of the water?

8.0 °C

On average, a human being needs approximately 445 grams of O2 in a day. How many molecules of O2 are required to meet this requirement?

8.37 x 10^24 molecules

What is the percent composition of an unknown hydrocarbon that is found to contain 21.7 grams of carbon and 4.85 grams of hydrogen? What is the percent of Carbon?

81.9 %

Iron metal can be isolated by reaction iron (III) oxide and carbon monoxide to produce solid iron and carbon dioxide gas according to the equation : Fe2O3 + 3CO ⟶ 2Fe + 3CO2 When 12.5 grams of Fe2O3 reacts with 12.5 grams of CO, the reaction should produce 8.74 g of Fe. Cassie runs this reaction in her lab and is only able to produce 7.74g of Fe. What is her percent yield?

88.6%

Silicon dioxide reacts with elemental carbon to produce silicon carbide and carbon monoxide gas according to the reaction: SiO2 + 3C ⟶ SiC + 2CO If 2.25 moles of SiO2 react with 7.25 moles of C to produce 81.1 g of SiC in the lab, what is the percent yield for this reaction?

89.9%

A 7583 mL tank holds 9.55 moles of helium gas at 0.9803 atm. Calculate the temperature of the gas in K.

9.48 K

Silicon dioxide reacts with elemental carbon to produce silicon carbide and carbon monoxide gas according to the reaction: SiO2 + 3C ⟶ SiC + 2CO If 2.25 moles of SiO2 react with 7.25 moles of C, what is the theoretical yield of SiC?

90.2 g SiC

Potassium chloride reacts with lead (II) nitrate to form potassium nitrate and lead (II) chloride according to the following equation: 2KCl + Pb(NO3)2 ⟶ 2KNO3 + PbCl2. Camryn runs this reaction with 24.9 g of KCl and 20.4 g of Pb(NO3)2 and produces 11.3 g of KNO3. What is the percent yield of this reaction?

91.1%

If 66.2 Liters of Carbon Monoxide gas react with excess Hydrogen, how many grams of methanol (CH3OH) can be made? CO (g) + 2 H2 (g) ⟶ CH3OH (g)

94.7 g

Which of the statements below are true regarding systems and surroundings?

A system is where the reaction occurs, while the surroundings are everything outside of that reaction

What type of reaction is the following reaction? H2O + NH3 --> OH- + NH4+

Acid/base reaction

What type of reaction is the following reaction? NaCl + AgNO3 --> NaNO3 + AgCl

Acid/base reaction

Balance the following equation by filling in the blanks. Al2O3 + K ⟶ K2O + Al

Al2O3 + 6 K ⟶ 3 K2O + 2 Al

Which of the following statements concerning the nature of emissions from naturally radioactive materials is incorrect?

Alpha particles carry a negative charge.

In the following reaction, which is considered a Bronsted-Lowry base? H2O + F- --> HF + OH- A. H2O B. F- C. HF D. This is not an acid-base reaction

Answer B

Which of the following compounds would be considered an electrolyte? A. C6H12O6 B. NaOH C. CO2 D. AgCl

Answer B

Which of the following molecules can have hydrogen bonding intermolecular force A. H2S B. H3N C. H3P D. HBr

Answer B

Which of the following reactions is a precipitation reaction? A. HCl + NaOH ⟶ H2O + NaCl B. 3CaCl2 + 2(NH4)3PO4 ⟶ Ca3(PO4)2 + 6NH4Cl C. C + O2 ⟶ CO2 D. 2Na + Cl2 ⟶ 2NaCl

Answer B

Which of the following is considered a strong base? A. Mg(OH)2 B. Al(OH)3 C. Sr(OH)2 D. Ni(OH)2

Answer C

Which of the following is the correct chemical formula for chlorous acid? A. HCl B. HClO3 C. HClO2 D. HClO

Answer C

Which of the following scenarios would be an acidic solution? A. [H3O+] < [OH-] B. [H3O+] = [OH-] C. [H3O+] > [OH-] D. [H3O+] is not related to [OH-]

Answer C

Which of the following shows an Arrhenius base? A. NH3 + H+ ⟶ NH4+ B. H2SO4 ⟶ H+ + SO42- C. NaOH ⟶ Na+ + OH- D. HCl ⟶ H+ + Cl-

Answer C

In the following reaction, which one is the conjugate acid of the base? H2O + NH3 --> OH- + NH4+ A. H2O B. NH3 C. OH- D. NH4+

Answer D

What is the correct formula for nitrous acid? A. HN B. H3N C. HNO3 D. HNO2

Answer D

Which of the following substances would be soluble in mineral oil? A. H2O B. HF C. H3N D. H2

Answer D

______ is considered a weak acid because it _______ dissociates in water.

Answer D

Which of the following reactions is a neutralization reaction? A. H2S + 2NaOH ⟶ 2H2O + Na2S B. 6NaCl + Ca3P2 ⟶ 2Na3P + 3CaCl2 C. C + O2 ⟶ CO2 D. 2HCl + Li2S ⟶ 2LiCl + H2S

Answer. A

Which of the following reactions is a REDOX reaction? A. H2S + 2NaOH --> 2H2O + Na2S B. 6NaCl + Ca3P2 --> 2Na3P + 3CaCl2 C. C + O2 --> CO2 D. HCl + NaOH --> NaCl + H2O

Answer. C

Which of these atoms has the most stable nuclei?

Au

In the following REDOX reaction, which atom is being oxidized? 2C2H6 + 7O2 --> 4CO2 + 6H2O

C

Balance the following equation by filling in the blanks. CaCO3 + HCl ⟶ CO2 + H2O + CaCl2

CaCO3 + 2 HCl ⟶ CO2 + H2O + CaCl2

Energy that is located within the bonds of a molecule is classified as __________ energy.

Chemical

What type of energy is the energy found in the bonds of molecules?

Chemical

A hand warmer consists of two layers. The inner layer contains two chemicals separated by a thin plastic coating. The outer layer is thicker, and protects users from exposure to chemicals. What two types of energy are seen if the inner plastic layer is broken, allowing the chemicals to mix and produce heat?

Chemical and Thermal

A hot pack gets hot after the molecules inside the container react. Based only on the information provided, what energy changes are occuring?

Chemical to Thermal

Which type of energy is correctly paired with its description?

Chemical: energy found in the bonds between atoms

How is a supersaturated solution made?

Dissolve more than the maximum amount of solute possible in a given amount of water and then increase the temperature to dissolve and cool.

A reaction's reactants possess 200.0 kJ of energy, and its products possess 250.0 kJ of energy. What type of reaction is this?

Endothermic

An ice cube melts on your hand. This is an example of an ______________ reaction

Endothermic

Which of the following is true for the 1st law of thermodynamics;

Energy can be transferred

A campfire is an example of an _____________ reaction.

Exothermic

A reaction gives an enthalpy (ΔH) value of -1283.0 kJ/mol. This reaction is;

Exothermic

A reaction's reactants possess 400.0 kJ of energy, and its products possess 200.0 kJ of energy. What type of reaction is this?

Exothermic

A thermometer works by directly measuring the amount of heat energy around it.

False

Asphalt has a higher heat capacity than water.

False

Energy can be destroyed

False

From the solubility table, you would write Na2SO4 as Na2SO4 (s).

False

Gas particles are almost always in motion, and stop only when they collide with the walls of their container.

False

Gas pressure is caused by the temperature and size of gas particles.

False

Lithium hydroxide is frequently used to neutralize sulfuric acid according to the equation: 2LiOH + H2SO4 ⟶ 2H2O + Li2SO4. If 5.6 g of LiOH reacts with 10.2 grams of H2SO4, LiOH is the limiting reactant.

False

Temperature measures heat

False

The following equation is balanced: KI + Pb(NO3)2 --> 2KNO3 + PbI2

False

ΔH is measured in J/mole

False

Which of the following statements concerning the penetrating power into matter of various types of radiation is correct?

Gamma radiation penetrates deeper than alpha particles.

Which of the following states of matter increases solubility with decreased agitation?

Gas

Which statement is true according to Kinetic Molecular Theory?

Gas particles transfer energy through collisions.

Which of the following represents the balanced the equation for the following reaction: Hydrochloric acid reacts with lithium hydroxide to produce lithium chloride and water

HCl + LiOH --> LiCl + H2O

What is the name of the following compound? H2S

Hydrosulfuric acid

Iron metal can be isolated by reaction iron (III) oxide and carbon monoxide to produce solid iron and carbon dioxide gas according to the equation : Fe2O3 + 3CO ⟶ 2Fe + 3CO2 If 12.5 grams of Fe2O3 reacts with 12.5 grams of CO, what is the limiting reactant?

If 12.5 grams of Fe2O3 reacts with 12.5 grams of CO, what is the limiting reactant?

If a hot air balloon is filled with 78,000 moles of gas and then that gas is heated from 293 degrees Kelvin to 380 degrees Kelvin with a propane flame, what will happen to the volume of the balloon?

It will Increase

If a can with a volume of 500ml is filled with gas at a temperature of 25° Celcius, and the can is sealed so that the amount of gas in the can cannot change, what will happen to the pressure in the can if you put it in the freezer?

It will decrease

If a football is filled indoors with 4236 mL of air at a temperature of 25° Celsius, what will happen to the volume of the football if you take it outside on a winter day with an ambient air temperature of 2° Celsius?

It will decrease

If the temperature of a gas is decreased while the amount is held constant, what will happen to the volume of the gas?

It will decrease

If the number of moles of a gas is increased while the temperature is held constant, what will happen to its volume?

It will increase

If the volume a gas occupies is decreased while the temperature and amount are held constant, what will happen to the pressure that gas exerts?

It will increase

Energy associated with the movement is classified as ___________ energy.

Kinetic

What type of energy is associated with movement?

Kinetic

Energy associated with movement is also classified as _____________ energy.

Kinetic energy

Mark is conducting a quantitative experiment combusting ethylene (C2H4), a highly flammable hydrocarbon, to produce carbon dioxide and water according to the following reaction: C2H4 + 3O2 --> 2CO2 + 2H2O Mark begins his experiment with 5.0 moles of ethylene which can theoretically produce 180 grams of water. He also has 5.0 moles of oxygen available which can theoretically produce 60. grams of water. At the end of his experiment, he has produced 55 grams of water. Which of the following correctly identifies the limiting reactant and the percent yield for Mark's experiment?

Limiting Reactant = Oxygen; Percent Yield = 92%

What is the name for the compound, Mg(OH)2?

Magnesium hydroxide

Critical mass can be defined as:

Mass required to generate a self-sustaining nuclear reaction.

Your lab partner has finished analyzing data and asks to compare his calculations with yours. While your data was collected together, you determined the empirical formula of your compound to be C2H4O3 and your partner argues that the correct empirical formula is C6H12O9. Is your partner drawing an accurate conclusion from the data you collected?

No because his formula is not in simplest terms

Which of the following is not a characteristic of a nuclear reaction?

Only electrons are involved in the breaking and forming of bonds.

Potassium chloride reacts with lead (II) nitrate to form potassium nitrate and lead (II) chloride according to the following equation: 2KCl + Pb(NO3)2 ⟶ 2KNO3 + PbCl2. What is the limiting reactant if 24.9 g of KCl reacts with 20.4 grams of Pb(NO3)2?

Pb(NO3)2

A rock is perched upon a cliff. It has __________ energy.

Potential

Stored energy is classified as ___________ energy.

Potential

What type of energy is stored energy?

Potential

Stored energy is also classified as _____________ energy.

Potential Energy

A pool player uses the cue stick to strike the cue ball sending it down the pool table. The cue ball gently hits the eight ball, sending it into a nearby pocket. Based only on the information provided, what two forms of energy are present in this example?

Potential and Kinetic

A race car gets slightly bumped by another driver during a NASCAR race. This causes the race car that was bumped to slam into the wall. Based only on the information provided, what two forms of energy are present in this example?

Potential and Kinetic

An Olympic high diver stands on the edge of a diving board before gracefully diving into the water. Based only on the information provided, what two forms of energy are present in this example?

Potential and Kinetic

Which part of a reaction has more energy for an endothermic reaction?

Products

What type of reaction is the following reaction? 2 H2O2 ⟶ 2 H2O + O2

REDOX reaction

Which part of a reaction has more energy for an exothermic reaction?

Reactants

What are the products in a neutralization reaction?

Salt + water

Silicon dioxide reacts with elemental carbon to produce silicon carbide and carbon monoxide gas according to the reaction: SiO2 + 3C --> SiC + 2CO If 2.25 moles of SiO2 react with 7.25 moles of C, what is the limiting reactant?

SiO2

Which of the following states of matter increases solubility with increased temperature?

Solid

When oxygen gas is pumped into water to make a solution, oxygen is the

Solute

Radioactive decay can be defined as

The disintegration of a radioactive nucleus in a sequence of nuclear reactions that ultimately yields a stable isotope.

Radioactive decay can be defined as:

The disintegration of a radioactive nucleus in a sequence of nuclear reactions that ultimately yields a stable isotope.

When a beta particle is emitted from the nucleus, which of the following happens to the mass of the parent element?

The mass remains the same

A cold piece of iron is placed inside of an empty bowl. Boiling water is poured on top of the iron. Which of the following is true about this experiment:

The metal will get warmer because the water will add energy to it.

A piece of zinc is placed over a Bunsen burner until it starts to melt. While still mostly solid, the zinc is dropped into a beaker of cool water. Which of the following is true about this experiment:

The metal will transfer energy to the water, making the water get warmer.

Which of the following does not change when a blue colored solution is diluted?

The moles of solute

When potassium bromide is dissolved in water, which part is attracted to the oxygen in water?

The potassium ion

If a tire with a volume of 860 mL is filled with air at a temperature of 25° Celsius, what will happen to the pressure in the tire if the temperature is doubled?

The pressure is doubled

If the temperature of a gas is decreased by half while the volume and amount are held constant, what will happen to the pressure that gas exerts?

The pressure is halved

If the volume of a gas is decreased by half while the number of moles is also decreased by half, what will happen to the pressure of the gas?

The pressure remains the same

Before a chemical reaction begins, reactants of a chemical equation have 200.0 kJ of energy. After the reaction has completed, the products now have 450.0 kJ of energy. Which of the following is true about this reaction?

The reaction is endothermic, 250.0 kJ of energy were absorbed, the enthalpy value for this reaction is positive.

Before a chemical reaction begins, reactants of a chemical equation have 300.0 kJ of energy. After the reaction has completed, the products now have 550.0 kJ of energy. Which of the following is true about this reaction?

The reaction is endothermic, 250.0 kJ of energy were absorbed, the enthalpy value for this reaction is positive.

Find the statement below that would be true about the following equation; 571.64 + 2H2O ⟶ 2H2 + O2

The reaction is endothermic, The reaction is gaining energy

Before a chemical reaction begins, reactants of a chemical equation have 550.0 kJ of energy. After the reaction has completed, the products now have 300.0 kJ of energy. Which of the following is true about this reaction?

The reaction is exothermic, -250.0 kJ of energy were released, the enthalpy value for this reaction is negative

Find the statement below that would be true about the following equation; CH4 + O2 ⟶ CO2 + H2O + 785 kJ/mol

The reaction is exothermic, The reaction is losing energy

When NaCl dissolves in water, what is attracted to the oxygen in water?

The sodium ion is attracted to the oxygen in water.

If an engine cylinder contains 90 mL of gas at a temperature of 30° Celsius and a pressure of 1 atm. That volume is then compressed to 30 mL. If the pressure remains the same, what will happen to the temperature of the gas in the cylinder?

The temperature will decrease by a factor of three.

If the number of moles of a gas is doubled while the temperature and pressure is held constant, what will happen to its volume?

The volume is doubled

If the temperature of a gas is increased four times while the pressure and number of moles are held constant, what will happen to the volume of that gas?

The volume is quadrupled

What type of energy is heat energy?

Thermal

A cup of hot chocolate becomes cold when it loses its energy after sitting out too long. What type of energy is being described?

Thermal Energy

Which of the following is true regarding the process of determining ΔH using Calorimetry?

To convert J into kJ divide by 1000

Which of the following is false regarding the process of determining ΔH using Calorimetry.

To convert J into kJ multiply by 1000

A rock rolling down a hill involves the transfer of potential energy into kinetic energy.

True

During fission, two new smaller atoms, two or three neutrons, and a lot of energy (mostly as heat) are released.

True

Energy can be transferred from one substance to another?

True

Fission occurs when a neutron strikes the nucleus of a uranium-235 atom, causing the atom to split apart.

True

If the neutrons that were released hit other uranium-235 atoms, these atoms may fission.

True

The distances between gas particles could be considered great when compared to the size of the particles themselves.

True

The equation is balanced: 2Fe + 3Cl2 --> 2FeCl3

True

Within seconds, millions of atoms can be fissioning. This sequence of events is called a nuclear chain reaction.

True

ΔH is measured in kJ/mol

True

Which of the following is not considered an example of a dilution?

Water evaporating from a cup of chicken stock

Iodine-131 undergoes "beta decay". What other particle is produced?

Xe-131

A forensic scientist determines the percent composition of a hydrocarbon to be 65% carbon, 14% hydrogen and 21% oxygen. She also determines the molar mass of the compound to be 148 g/mol. She claims the molecular formula for the compound is C8H21O2. Is this a correct conclusion that can be drawn from the data?

Yes because the molecular mass and the empirical formula established by the data match

The property of water that allows water molecules to stick to other substances is called

adhesion

Which of the following particles would not be able to pass through paper?

alpha particle

A beta particle is essentially:

an electron

A solution has an [H+] = 4.58 · 10-9 M. This solution is

basic

Which of the following types of radiation is composed of particles with a charge and mass identical to that of an electron?

beta particles

Which of the following processes increase the atomic number by 1?

beta-particle production

Nuclear fission _______.

can be controlled in a nuclear reactor

The curved meniscus of water in a graduated cylinder can best be attributed to

capillary action.

A hand warmer gets warm after the molecules inside the container combine. Based only on the information provided, which of the following shows the energy change?

chemical to thermal

According to the first law of thermodynamics, energy cannot be _______ or _______. But it can be ____________.

created, destroyed, transferred

Gas particles have kinetic energy that is ______________ proportional to their Kelvin temperature.

directly

A strong acid or base

dissociates completely in water

If a substance is soluble in water, this means that it ______ in water.

dissolves

Gas molecules exert no attractive or repulsive forces on each other or the container walls; therefore, their collisions are ________________.

elastic

When a substance can conduct electricity in water, it is called a(n) ____.

electrolyte

When an atom is reduced, it

gains electrons.

Which particle is considered dangerous?

gamma particle

Temperature is the intensity of _____________ present in a substance.

heat

What particle is emitted in alpha radiation?

helium nucleus

The attractive forces that keeps water molecules together and creates surface tension are called

hydrogen bonding.

The reason granulated sugar dissolves quicker than a sugar cube is due to granulated sugars

increased surface area

As the temperature of gas molecules is decreased, their kinetic energy, and therefore the pressure exerted by the molecules, _________________.

is decreased

If a solution is considered miscible, then the solute is a liquid and the solvent is a solid .

liquid

When performing a dilution, the concentration of the final solution will always be ____ the original solution.

lower than

The amount of a gas is counted in _____________.

moles

What unit of measure is the key to performing stoichiometric calculations?

moles

What are the units of molarity?

moles/liter

A concentrated solution is a solution where

more solute is dissolved a small amount of solvent

Radioactivity results from the decay of unstable:

nuclei

If a solution has more solute dissolved in the solvent than the solvent can theoretically dissolve, then this solution is said to be

supersaturated

A sample of salt is placed within a Styrofoam cup filled with water. The salt dissolves rapidly. The water inside the cup gets colder, while the cup stays the same temperature. The salt is the _______, while the water is the ___________.

system, surroundings

Nuclear fusion ________.

takes place in the Sun

You light a campfire to cook s'mores. The system for this reaction is ___________, and the surroundings are ___________.

the logs burning on the fire; everything outside of the fire

In a water molecule,

the oxygen end of the molecule is slightly negative and the hydrogen end is slightly positive.

The amount of three-dimensional space a gas occupies is its _______________.

volume

Liquid water is placed into a freezer. Heat transfers from the __________ to the ________, resulting in an ___________ process.

water, freezer, exothermic

What particle can pass through metal but not lead?

γ