Labflow Final Review

This is the process of separating a liquid from a solid (sediment) by gently pouring the liquid from the solid so as not to disturb the solid.

Decantation

A sample of air has 5.55 moles of N2 and 1.74 moles of O2. What is the total volume for the sample of air described, if the pressure is 10.15 atm and the temperature is 325 K?

19.2 L

Determine how many significant figures are in the following number. 4500

2

What is the weight per volume of 50.0 mL NaCl solution that contains 3.73 g NaCl?

7.46 %

The separation of the components of a mixture is based upon the fact that each component has different properties

physical

Write the chemical name for: NaNO3

sodium nitrate

Why can't sodium (Na) and iron (Fe) form an ionic compound?

Sodium and iron both form cations.

gas

Takes the shape of its container Can change volume Low density

Hydrogen bonds are extremely important in biological molecules. One example of a biological/biochemical molecule that uses hydrogen bonding is DNA.

The hydrogen bonds in this molecule occur as H from one region bond with O or N from another.

Pouring an approximate volume of liquid into a buret

beaker

Write the chemical name for: Cu2O

copper(I)oxide

A liquid is carefully poured out, leaving the solid behind in the container.

decantation

Colligative properties are dependent on the amount of a solute, but are not

dependent on the nature of the solute.

A reaction is complete when stoichiometrically

equivalent amounts of the reacting substances are combined.

The pressure and volume are increased. What will happen to the temperature?

increase

The relationship between pressure and volume of a gas is inverse so that as volume decreases, pressure

increases

Solution that involves no net movement of water with the cell

isotonic

The calculated amount of product under ideal conditions

theoretical yield

In the neutralization reaction H2SO4+2KOH−⇀↽−2H2O+K2SO4HX2SOX4+2KOH↽−−⇀2HX2O+KX2SOX4 If there is 909 mL of 0.210 M H2SO4 reacting with 427 mL of a KOH solution with unknown concentration, what is the concentration of KOH?

.894

Identify the set of coefficients that balances the equation___PbCl2 + ___K2CO3 → ___PbCO3 + ___ KCl

1,1,1,2

Use the ideal gas law to solve for the temperature of a gas that's kept at 1.62 atm, 22.4 liters, and contains 1.60 moles. Report the temperature in K.

275 K

Convert the following (to the appropriate number of significant figures): 130 pounds to kilograms

59 kg

How can a solid dissolved in water be separated from the water?

Evaporation

Write the chemical formula for iron (III) sulfide.

Fe2S3

For the following forward chemical equation, identify the acid/base/conjugate acid/conjugate base. HCO3−+H2O−⇀↽−H3O++CO32−HCOX3X−+HX2O↽−−⇀HX3OX++COX3X2−

HCO3-A CO32-CB H30=CA H20-B

When completing the ionization equation of perchloric acid with water, fill in the coefficients and products.

HClO4+H2O⟶ 1ClO4-+1H3O+

Design a Lewis structure for PF3 that satisfies the octet rule for every atom. Which of the following correctly describes what surrounds the phosphorus atom?

Three single bonds and one pair of electrons

For the following concentrations, determine if the solutions are acidic, basic, or neutral and select the best answer from the subsequent choices. a. [H3O+]=0.0115 M b. [OH-]=0.45 M c. [H3O+]=1.25 x 10-10 M

a=acidic; b=basic; c=basic

Classify the following chemical reaction as a combination, decomposition, single-replacement, double-replacement, or combustion reaction: 2NaHCO3 → Na2CO3 + CO2 + H2O

decomposition

Determine the ion that would satisfy the octet rule for fluorine.

f^1-

Solution with greater solute concentration than the solution in the cell

hypertonic

Mixtures are separable into these components by

physical means

What is the total number of valence electrons in the compound: C2H6O

20

Convert 108 Celsius to Fahrenheit.

226.4

Identify the total number of valence electrons in SO32-.

26

How many moles are in 43.0 grams of carbon?

3.58 mol

Use the ideal gas law to solve for the pressure (in atm) that is present in 5.6 moles of gas, at a temperature of 285 Kelvin and a volume of 20.0 liters.

6.6 atm

Convert the following (to the appropriate number of significant figures): 40.75 miles to kilometers

65.58

Each answer below describes the connectivity around a single atom. Which answer violates the octet rule (i.e., which one is not a possible bonding configuration for the central atom)?

One single bond and two double bonds

When a sample is described using the units mole, what is being measured?

The number of molecules in the sample

An _________________ chemical reaction is a chemical reaction in which heat energy is needed for the reaction to occur.

endothermic

Most of the matter people encounter in everyday life consists of

mixtures of different substances

Classify the following chemical reaction as a combination, decomposition, single-replacement, double-replacement, or combustion reaction: Mg + 2HCl → MgCl2 + H2

single replacement

Identify the set of coefficients that balances the equation___CO + ___H2 → ___CH3OH

1,2,1

Identify the set of coefficients that balances the equation___HI → ___H2 + ___I2

2,1,1

Identify the set of coefficients that balances the equation___SO2 + ___O2 → ___SO3

2,1,2

Identify the set of coefficients that balances the equation___ICl5 → ___Cl2 + ___I2

2,5,1

What is the pH of a solution of 1.00 L of water with 0.0384 moles of NaOH in it?

12.6

How do conversion factors affect the number of significant figures in a problem?

Many conversion factors are available to a large number of significant figures or, in the case of exact numbers, infinite significant figures. The number of significant figures the answer is almost always limited by the number of significant figures in the starting values.

Predict the ionic compound that would form when each of these two ions come together: Na and F

NaF

What is necessary for a molecule to be considered polar?

Polar molecules have a net difference in electronegativity over the entire molecule.

Convert the following (to the appropriate number of significant figures): 30 miles per hour to kilometers per minute

.8 km/min

Verify the following chemical equation is balanced. 2Mg + O2 → 2MgO With 0.5 moles of O2, how many moles of Mg would be needed to react? (Write only the number of moles in the blank to answer the question! For example, write 3 not 3 moles.)

1

Identify the set of coefficients that balances the equation___H2O + ___CO → ___CO2 + ___H2

1,1,1,1

Solve for the following using the correct number of significant figures. 8.78 m * 2.5 m = _______ m2

22

Identify the set of coefficients that balances the equation___H2 + ___N2 → ___NH3

3,1,2

Identify two (2) physical properties that a polar compound and a non-polar compound would differ on.

Solubility Melting point

What statements are always true about limiting reactants?

The limiting reactant is completely used up in the reaction. The limiting reactant dictates the amount of product. There will be an excess of other reactants at the end of the reaction.

What is the equivalence point in an acid-base titration experiment?

The point at which the moles of base equals the moles of acid

Write the chemical name for: NiCl2

nickel(II)chloride

a liquid consisting of one substance dissolved in another

solution

What is the molarity of a solution prepared by dissolving 12 g of HCl in enough water to make 742 mL of solution?

.44

What is the osmolarity of a solution containing 0.1 M NaNO3 and 0.2 M NaCl?

.6

What is the density of a substance (g/mL) where 1.524 gallons has a mass of 3,467.0 grams? 1 gallon = 3785.5 mL

.601

Verify the following chemical equation is balanced TiO2 + 3C → Ti + 2CO If you begin with 36 grams of carbon, how many moles of C does that make?

3

Verify the following chemical equation is balanced. 2Mg + O2 → 2MgO With 6 moles of Mg, how many moles of O2 would be needed to react? (Write only the number of moles in the blank to answer the question! For example, write 3 not 3 moles.)

3

What is the correct reading of the volume in the pictured buret? Make sure to report your reading with the appropriate significant figures.

39.95 mL

Antacids neutralize the hydrochloric acid in your stomach. What is the correct neutralization reaction of stomach acid with DiGel (Al(OH)3)(Al(OH)X3) ?

3HCl+Al(OH)3⟶3H2O+AlCl3

Determine how many significant figures are in the following number: 0.06589.

4

Verify the following chemical equation is balanced. 2Mg + O2 → 2MgO With 2 moles of O2, how many moles of MgO will be produced? (Write only the number of moles in the blank to answer the question! For example, write 3 not 3 moles.)

4

Verify the following chemical equation is balanced TiO2 + 3C → Ti + 2CO If you begin with 88.2 kilograms of TiO2, how many kilograms of Ti can you make?

52.9 kg of Ti

A balloon is inflated outside on a cool morning. As the temperature rises, reaching its peak in the afternoon, the volume of the balloon will increase.

As the temperature cools down again in the evening, the volume of the balloon will decrease.

Predict the ionic compound that would form when each of these two ions come together: Ca and P

Ca3P2

For the following forward chemical equation, identify the acid/base/conjugate acid/conjugate base. NH3+HCl−⇀↽−Cl−+NH4+NHX3+HCl↽−−⇀ClX−+NHX4X+

HCL-A NH4-CA Cl--CB NH#-B

Identify whether each substance is an acid or base.

RbOH-B HCLO4-A HNO2-A KOH-B Ba(OH(2-B

If you want to return the two liquids to the same height in the tube, apply a pressure equal to the osmotic pressure to the solution on the

right side of the tube.

a liquid that dissolves another substance

solvent

Identify two covalent compounds that are present in your home.

sugar vegetable oil

What is the osmolarity of a solution containing 0.2 M NaNO3 and 0.3 M sucrose?

.7

Aluminum has a density of 2.70 g/cm3. What is the mass (g) of aluminum foil that has a volume of 48.9 cm3?

132 g

Antacids neutralize the hydrochloric acid in your stomach. What is the correct neutralization reaction of stomach acid with Milk of Magnesia (Mg(OH)2)(Mg(OH)X2) ?

2HCl+Mg(OH)2⟶2H2O+MgCl22HCl+Mg(OH)X2⟶2HX2O+MgClX2

What is the percent-by-mass, %(m/m), concentration of Na2SO4 in a solution made by dissolving 35.2 g of Na2SO4 in enough water to give 96.0 g of total solution?

36.7

Consider the balanced equation for the combustion of benzene, C6H6CX6HX6 . 2C6H6+15O2⟶12CO2+6H2O2CX6HX6+15OX2⟶12COX2+6HX2O What molar ratio will appear when calculating the amount of O2OX2 needed to react with a given amount of C6H6CX6HX6 ?

15 mol O2 2 mol C6H6

When completing the reaction of ammonia with water, fill in the coefficients and products.

1OH-+1NH4+

Which sample would have the most atoms of oxygen present?

2.00 moles of Al2O3

What is the mass (in g) of 7 atoms of helium?

4.65 x 10-23

How do you determine the last digit in any measured number on a non-digital instrument?

Estimate one digit past the smallest precisely known digit or marking.

For the following concentrations, determine if the solutions are acidic, basic, or neutral and select the best answer from the subsequent choices. a. [H3O+]=0.15 M b. [OH-]=0.0045 M c. [OH-]=1.25 x 10-10 M

a=acidic; b=basic; c=acidic

Describe the following as acidic, basic, or neutral: Lemon juice Select one:

acidic

a value used to describe the amount of one substance dissolved in another

concentration

Select the best description of H2SO4.

diprotic acid

How many grams of KOHKOH are needed to neutralize 10.8 mL of 0.15 M HClHCl in stomach acid?

0.091

Verify the following chemical equation is balanced TiO2 + 2C → Ti + 2CO If you begin with 28.6 kilograms of carbon, how many moles of Ti can you make?

1.19 x 103 moles of Ti

Determine the formula mass for C7H16N.

114.24

How many grams of glucose (C6H12O6) are there in 911.47 mL of a 15.63 %(m/v) glucose-water solution?

142.5

Verify the following chemical equation is balanced N2 + 3H2 → 2NH3 If you begin with 14 grams of N2, how many grams of NH3 can you make?

34

A sample of air has 3.55 moles of N2 and 2.50 moles of O2. What is the total pressure for the sample of air described, if the volume is 29.51 L and the temperature is 300 K?

5.06 atm

What is the mass of NaCl in 51.2 mL of a 10.0% w/v solution?

5.12 g

Convert the following (to the appropriate number of significant figures): 2.953 km / 53.9 m = _____________ (the answer has no units)

54.8

Choose the best summary of the octet rule.

Elements are inclined to bond in a manner that gives them eight electrons in their valence shell.

Solution with lower solute concentration than the solution in the cell

Hypotonic

Consider two solutions; one of a weak acid and one of a strong acid. How is it possible that a solution of weak acid can have a lower pH than a solution of strong acid?

The concentration of the weak acid is greater than the concentration of the strong acid.

After assembling a gravity filtration apparatus, begin the separation of a mixture by decanting it into the filter paper. Pour the entire contents of the mixture into the filter paper, stirring the solid in the filter paper if needed to speed up the filtration. After all the liquid has drained through the filter paper, finish by rinsing the solid with solvent.

After a mixture has been poured through filter paper, the solid component remains on top while the liquid flows through. To collect the solid, spread the filter paper on a watch glass and allow the solvent to evaporate.

Which of the following compounds are insoluble in water?

MgCO3 Al2S3 PbBr2

Predict the ionic compound that would form when each of these two ions come together: Mg and Cl

MgCl2

Fill in the steps for an experimental procedure to measure out 3.50 moles of DI water into a 400 mL beaker given any equipment available in your lab drawer. [Hint: You cannot measure out 3.50 moles of water with the electronic balances in our lab. You will need to convert the units of moles into something else that you can measure out accurately. You may need to use the density of water in your calculations.]

Obtain a clean and dry graduated cylinder add 63.1 mL to glassware

Predict what happens when a base (OH-) is added to a buffer solution containing an equal mixture of a weak acid HA and its conjugate base A-. The pH of the solution will increase.

The concentration of the conjugate base A- will increase. The concentration of the weak acid HA will decrease.

Sublimation is a phase change from solid to gas.

The liquid phase is not present in this change.

Identify which balance was used to make each mass reading. 5.43 g 6.539 .90 4.000 1.230

balance with ±0.01 g tolerance A balance with ±0.001 g tolerance A balance with ±0.01 g tolerance A balance with ±0.0001 g tolerance A balance with ±0.001 g tolerance

When blood cells are placed in a 1.50% (m/v) solution of NaCl, this is considered:

hypertonic

Solution with equal solute concentration to the solution in the cell

isotonic

For a beaker containing the reaction below that is at equilibrium, using LeChatelier's principle, predict which way the equilibrium conditions will shift if silver chloride was added to a beaker. AgNO3(aq)+NaCl(aq)⟶AgCl(s)+NaNO3(aq)AgNOX3(aq)+NaCl(aq)⟶AgCl(s)+NaNOX3(aq)

left

2 cups of milk 2 avocados 144 grams of sugar 3 teacups 18 meters 1 ft=12 in

measured exact measured exact measured exact

For a beaker containing the reaction below that is at equilibrium, using LeChatelier's principle, predict which way the equilibrium conditions will shift if the concentration of sodium chloride is increased. AgNO3(aq)+NaCl(aq)⟶AgCl(s)+NaNO3(aq)AgNOX3(aq)+NaCl(aq)⟶AgCl(s)+NaNOX3(aq)

right

You are buying drinks for a party for the upcoming weekend. A gallon of milk is on sale for $2.99. A two-liter bottle of soda is on sale for $0.99 and a bottle of apple juice is on sale for $1.99 for 64 ounces. Which drink is the best value for your party?

soda

For the following chemical equation, which answer best represents the equilibrium constant K? 2A+B__> 2X+Y

([x]2×[y]) ([a]2×[b])

For the following chemical equation, which answer best represents the equilibrium constant K? A+B↽−−⇀X+Y

([x]×[y]) ([a]×[b])

Identify five (5) characteristics of bromine.

red-brown liquid at room temperature strong scent halogen reactive with metals

Convert the following (to the appropriate number of significant figures): 28 miles per hour to kilometers per minute

.75 km/min

Convert 34 m to km.

0.034 km

Solve for the following using the correct number of significant figures. 7.7 g / 108.83 mL = _______ mL

0.071

What is the value of the gas constant, R, in units of L⋅atmmol⋅KL⋅atmmol⋅K ?

0.0821

Convert 228 mg to g.

0.228 g

Calculate the volume of a metal cylinder that has a diameter of 0.95 cm and a height of 1.91 cm.

1.4 cubic centimeters

Solve for the following using the correct number of significant figures. 355.8 g + 0.736 kg = _______g

1092

Select the coefficients necessary to balance the neutralization reaction. Choose a coefficient for every compound.

1H2SO4+HX2SOX4+ 2 KOH⟶KOH⟶2 H2O+HX2O+ 1K2SO4

Determine how many significant figures are in the following number: 6.7 x 103.

2

What is the osmotic pressure (in atm) of a 0.197 L solution containing 0.700 g of CaCl2CaClX2 at 295 K? The molar mass of the solute is 110.98 g/mol and the value of the gas constant, RR , is 0.0821 L-atm/mol-K.

2.33

The temperature of a room is 23.7 °C. What is this temperature expressed in Kelvin (K)?

296.9

Determine how many significant figures are in the following number: 20.0.

3

Determine how many significant figures are in the following number: 8.60 x 104.

3

Consider the balanced reaction of magnesium and oxygen. 2Mg+O2⟶2MgO2Mg+OX2⟶2MgO What mass of MgO can be produced from 1.93 g of Mg and 2.07 g of O2?

3.2 g

Suppose a 12.6 g potato slice is soaked in solution. After it is removed, the mass of the potato is 18.9 g. What is the percent change in mass?

50%

Convert the following (to the appropriate number of significant figures): 13.6 meters to inches

535 inches

Choose the best graduated cylinder to make each measurement in a single use. 36 mL of water 5.75 mL of a sucrose solution 18.5 mL of a NaCl solution

A 50 mL graduated cylinder with markings every 10 mL A 10 mL graduated cylinder with markings every 0.1 mL A 25 mL graduated cylinder with markings every 1 mL

This is the process of separating a solid from a liquid by means of a porous material.

Filtration

Solution that causes water to move out of the cell

Hypertonic

Solution that causes water to move into the cell

Hypotonic

Suppose you are collecting a gas over water at 23 oC and obtain a pressure reading of 780.7 mm Hg.If the vapor pressure of water is 21.1 mm Hg at the collection temperature, what is the pressure of the collected gas?

Pgas=780.7 mm Hg−21.1 mm HgPgas=780.7 mm Hg−21.1 mm Hg

Consider the balanced equation of KIKI reacting with Pb(NO3)2Pb(NOX3)X2 to form a precipitate. 2KI(aq)+Pb(NO3)2(aq)⟶PbI2(s)+2KNO3(aq)2KI(aq)+Pb(NOX3)X2(aq)⟶PbIX2(s)+2KNOX3(aq) What mass of PbI2PbIX2 can be formed by adding 4.00 g of KIKI to a solution of excess Pb(NO3)2Pb(NOX3)X2 ?

Start by finding the moles of KI using its molar mass. moles of KI=4.00 g KI×1 mol KI166.0 g KImoles of KI=4.00 g KI×1 mol KI166.0 g KI Then use the molar ratio between KI and PbI2 to find the moles of PbI2. moles of PbI2=moles of KI×1 mol PbI22 mol KImoles of PbIX2=moles of KI×1 mol PbIX22 mol KI Finally, use the molar mass of PbI2 to find the mass of PbI2. mass of PbI2=moles of PbI2×416.0 g PbI21 mol PbI2mass of PbIX2=moles of PbIX2×416.0 g PbIX21 mol PbIX2

liquid

Takes the shape of its container Maintains a constant volume High density

The H2HX2 produced in a chemical reaction is collected through water in a eudiometer. If the pressure in the eudiometer is 760.0 torr and the vapor pressure of water under the experimental conditions is 23.1 torr, what is the pressure (torr) of the H2HX2 gas?

The total pressure is equal to the pressure of the water vapor plus the pressure of the hydrogen gas. Ptotal=PH2O+PH2Ptotal=PHX2O+PHX2 Subtract the pressure of the water vapor from the total pressure to find the pressure from the H2HX2 . Ptotal−PH2O=PH2Ptotal−PHX2O=PHX2 760.0 torr−23.1 torr760.0 torr−23.1 torr

Why are these answers different for the number of minutes in a month?

There is a discrepancy in the number of days per month.

When describing the uncertainty of a measurement, the term ------ refers to the closeness between a measurement and its accepted value, whereas the term ----- refers to the closeness among a set of measurements.

accuracy, precision

The pressure is kept constant, while the temperature is decreased. What will happen to the volume?

decrease

The volume and temperature remain constant, while some of the gas is let out of the container. What will happen to the pressure?

decrease

A solvent is added to dissolve only one mixture component and then the liquids are separated.

extraction

Containing a stirred reaction mixture

flask

capable of measuring a range of volumes of liquid designed to measure one specific volume of liquid used for applications in which great accuracy is needed

graduates volumetric volumetric

are combinations of two or more substances.

mixtures

Consider the reaction of propane with oxygen. C3H8+5O2⟶3CO2+4H2OCX3HX8+5OX2⟶3COX2+4HX2O How many moles of CO2COX2 molecules are produced when 1.6 moles of O2OX2 molecules react completely?

mol CO2 produced=1.6 mol O2×3 mol CO25 mol O2

Dalton's Law of Partial Pressures states that the total pressure of a gas mixture is equal to the sum of the

partial pressures of all the component gases as long as the gases do not react with each other.

The comparison of the experimental amount of product to the calculated amount

percent yield

The components of a mixture are separated based on their properties

physical

The pressure and the temperature are both decreased by 50%. What will happen to the volume?

stay the same

Whereas pure substances have fixed compositions,

the composition of mixtures can vary

Convert 81.39 dL to mL.

8139 mL

Which set is from the same isoelectric series?

Al3+, Mg2+, Na1+, F1-

Predict whether the following salt is acidic, basic, neutral, or can't tell. NaCN Select one:

acidic

Write the chemical formula for chromium (IV) oxide.

CrO2

According to your textbook, how many of the following are properties of covalent compounds? Can be gas, liquid, or solid at room temperature. Does not conduct electricity. Exist as an extended array of atoms. Involves the sharing of electrons.

three

Solid:

Keeps its shape Maintains a constant volume High density

Each of the substances in the mixture retains its

chemical identity

What is the molarity of the solution prepared by diluting 25.3 mL of 2.10 M AgNO3 to the final volume 98.5 mL? Calculate your final answer to 2 decimal places.

.54

Draw a Lewis structure for CO32-. How many double bonds are present in the structure?

1

Fill in each description with the correct type of intermolecular force.

1. Dipole-dipole forces are an attraction between a positive region of a polar molecule and a negative region of another polar molecule. 2. London forces are attractions between temporary dipoles. 3. Hydrogen bonds are attractions between the -H of one molecule and an electronegative atom on another molecule.

What is the pH of a solution of 1.00 L of water with 0.0387 moles of HNO3 in it?

1.41

What is the price per gallon of the most cost-effective choice?

1.87

What is the pH of a solution of 1.00 L of water with 0.0685 moles of KOH in it?

12.8

What is the volume (cm3) of a sample of aluminum that has a mass of 338 g? (The density of aluminum is 2.70 g/cm3.)

125

How many milliliters of a 0.619 M KOH solution would be needed to provide 5.36 g of KOH to a chemical reaction?

154

Select the coefficients necessary to balance the neutralization reaction. Choose a coefficient for every compound.

2 HCl+1 Ca(OH)2-> 2 H2O + 1 CaCl2

What is the pH of a solution of 1.00 L of water with 0.00506 moles of HCl in it?

2.30

Verify the following chemical equation is balanced N2 + 3H2 → 2NH3 Given 68.5 grams of nitrogen, how many moles of nitrogen are present?

2.44

Solve for the pH of a buffer solution using the Henderson-Hasselbalch equation that is (pg. 309). A 1.0 L solution of 0.32 M HNO2 and 0.20 M NO22- constitutes a buffer solution. The Ka of HNO2 is 6.8 x 10-4. HINT: A is the concentration of the conjugate base and HA is the concentration of the weak acid. Do not forget to convert Ka to pKa.

2.96

Convert 56 Celsius to Kelvin.

329.15

Solve for the following using the correct number of significant figures. 8.30 m * 4.0 m = _______ m2

33

Determine how many significant figures are in the following number: 0.04790.

4

There are 24 hours per day, 60 minutes per hour, 7 days per week, and 4 weeks per month. How many minutes are in a month?

40320

Solve for the following using the correct number of significant figures. 76.44 m - 35.293 m = _________ m

41.15

There are 365 days per year, 24 hours per day, 12 months per year, and 60 minutes per hour. How many minutes are in a month?

43800

Use the ideal gas law to solve for the moles of gas that occupies 25.61 L at 5.13 atm and 27 °C.

5.32

Solve for the following using the correct number of significant figures. 2.668 km / 52.3 m = _______

51.0

Convert the following (to the appropriate number of significant figures): 33.64 miles to kilometers

54.14

Solve for the following using the correct number of significant figures. 14.825 mL + 18.5 mL + 25.37 mL = _________ mL

58.7

Verify the following chemical equation is balanced. 2Mg + O2 → 2MgO With 3 moles of O2, how many moles of Mg would be needed to react? (Write only the number of moles in the blank to answer the question! For example, write 3 not 3 moles.)

6

Solve for the following using the correct number of significant figures. 49.59 g + 15.7 g = _________

65.3

Convert the following (to the appropriate number of significant figures): 19.4 meters to inches

764 inches

Verify the following chemical equation is balanced N2 + 3H2 → 2NH3 If you begin with 280 grams of H2, how many moles of NH3 can you make?

93.3

Which of the following would not be helpful in separation a mixture of sand and salt?

A magnet would not be helpful in separating a mixture of sand and salt.

Consider the balanced equation for the reaction of aluminum with hydrochloric acid. 2Al+6HCl⟶2AlCl3+3H22Al+6HCl⟶2AlClX3+3HX2 Fill in the conversion factors required to calculate the mass of HCl needed to react with 5.00 g of Al. 5.00 g Al×( A )26.9815 g Al×( B )( C )×( D )1 mol HCl=20.3 g HCl5.00 g Al×( A )26.9815 g Al×( B )( C )×( D )1 mol HCl=20.3 g HCl

A-1 mol Al B-6 mol HCl C-2 mol Al D-36.454 g HCl

Identify the ideal value of the van't Hoff factor for aqueous solutions of each solute.

C12H22O11-1 NaCl-2 CaCl2-3 C2H6O-1 Na2SO4-3 NH4Cl-2

What is the correct molecular formula for calcium chloride?

CaCl2

Determine the ion that would satisfy the octet rule for chlorine.

Cl^1-

Using the guidelines from pages 119-123 of your textbook (Section 4.9 and 4.10), how many of the following bonds would be considered polar covalent bonds? Check all that apply. Select one or more:

H bonded to N N bonded to O

The boiling points for H2O (BP=100 °C) and H2S (BP=-60 °C) are drastically different despite oxygen and sulfur being next to each other on the periodic table. Choose the best explanation for this difference.

H2O can hydrogen bond, whereas H2S cannot. This strong intermolecular force makes it more difficult for the H2O molecules to transition from the liquid to the vapor phase.

Identify three ways you could increase the rate of an aspirin tablet dissolving in a glass of water.

Heat the water. Crush the aspirin tablet. Stir the mixture.

Order the three types of intermolecular forces (dipole-dipole, London force, hydrogen bonds) in order from weakest to strongest.

London forces (weakest) Dipole-dipole forces Hydrogen bonds (strongest)

What is the correct molecular formula for magnesium bromide?

MgBr2

For the chemical NH2CO2H, where N is bound to C and the 2 H's (H2N-C), each O is bound to C and the final H is on an O (O-H), create a Lewis structure. Which of the following is a correct description of the O without the H attached?

One double bond and two pairs (four dots) of electrons

What is the equilibrium expression (K= ) for the following reaction? AgNO3(aq)+NaCl(aq)⟶AgCl(s)+NaNO3(aq)AgNOX3(aq)+NaCl(aq)⟶AgCl(s)+NaNOX3(aq) Select one:

[NaNO3] [AgNO3][NaCl]

Predict whether the following salt is acidic, basic, neutral, or can't tell. NH4Br Select one:

acidic

The amount of product experimentally produced

actual yield

What is the correct description of the shape and polarity of H2O?

angled, polar

What is the shape on the center atom for SO2?

angular

Classify the following chemical reaction as a combination, decomposition, single-replacement, double-replacement, or combustion reaction: 2C2H6 + 7O2 → 4CO2 + 6H2O

combustion

An _________________ chemical reaction is a chemical reaction in which heat is produced.

exothermic

A solid is caught on paper or a membrane while the liquid passes through.

filtration

measuring out a volume of liquid

graduated cylinder

What is the correct units for formula mass (also known as molecular mass)?

grams/moles

For the following forward chemical equation, identify the acid/base/conjugate acid/conjugate base. H2SO4+KOH−⇀↽−H2O+KHSO4HX2SOX4+KOH↽−−⇀HX2O+KHSOX4

h20-CA H2SO4-A KOH-B KHSO4-CB

For the following forward chemical equation, identify the acid/base/conjugate acid/conjugate base. HCO3−+H2O−⇀↽−OH−+H2CO3HCOX3X−+HX2O↽−−⇀OHX−+HX2COX3

h20-acid oh-- CB HCO3--B H2CO3-CA

a chemical that is dissolved

solute

A solid mixture is heated. One component transitions directly between solid and gas.

sublimation

Identify the pieces of glassware that are most effective for accurate solution preparation.

volumetric flask volumetric pipet

A neutralization reaction is a reaction between an acid and a base that results in the formation of

water and a salt