chem b
A chemist has dissolved a certain substance in water. The chemist knows that more of the substance could be dissolved into the water before it stops dissolving. Therefore, the current solution is .
unsaturated
How many moles of nitrogen would react with excess hydrogen to produce 520 mL of ammonia?
0.012 mol
Which arrows represent the phase transitions in which heat energy is gained?
1, 2, and 3
Which reaction will occur?
2AgNO3 + Ni mc023-3.jpg Ni(NO3)2 + 2Ag
Which arrow would most likely represent the phase change that involves the same amount of energy as arrow 1?
4
Which arrow would most likely represent the phase change that occurs when silver is poured into a mold and cools to become a solid bar?
5
Which reactants would lead to a spontaneous reaction?
Ag+ and Cu
A 1-L soda bottle contains dissolved carbon dioxide gas. Which bottle would have the highest concentration of dissolved gas?
a
A hiker seals a plastic bag that contains dried fruits before he climbs a mountain. What will most likely happen to the plastic bag as the hiker reaches the top of the mountain?
a
Acid rain can be destructive to both the natural environment and human-made structures. The equation below shows a reaction that occurs that may lead to the formation of acid rain. 3NO2 + H2O mc025-1.jpg 2HNO3 + NO How many moles (precise to the nearest 0.01 mol) of nitric acid are produced from 300.00 mol of nitrogen dioxide?
a
An isotope undergoes radioactive decay by emitting radiation that has a -1 charge. What other characteristic does the radiation have?
a
Consider the balanced equation. 2HCl + Mg mc031-1.jpg MgCl2 + H2 If 40.0 g of HCl react with an excess of magnesium metal, what is the theoretical yield of hydrogen?
a
Consider the equation below. Na+ + Cl- mc013-1.jpg NaCl Which statement best describes the relationship between the substances in the equation?
a
During a redox reaction, the term reduction refers to
a
The chemical equation shows iron(III) phosphate reacting with sodium sulfate. 2FePO4 + 3Na2SO4 mc010-1.jpg Fe2(SO4)3 + 2Na3PO4 What is the theoretical yield of Fe2(SO4)3 if 20.00 g of FePO4 reacts with an excess of Na2SO4?
a
Water is initially present in a state where its molecules are far apart. During a change of state, its molecules slow down. Which change of state has most likely taken place?
a
What did the Curies conclude about radioactivity based on their studies?
a
Which answer defines exothermic reaction?
a
Which correctly defines molar volume of an ideal gas?
a
Which is the SI unit for pressure?
a
Which of the following is an oxidation-reduction reaction?
a
Which process most likely takes place when the kinetic energy of molecules overcomes the intermolecular forces?
a
Which reaction is exothermic?
a
Which refers to the amount of a solute that will dissolve in a given volume of solvent at a given temperature and pressure?
a
Which represents the empirical formula for A3B9?
a
Which sequence represents the relationship between temperature and volume as explained by the kinetic-molecular theory?
a
Which statement best explains water's ability to dissolve covalent compounds?
a
Which statement illustrates the difference between a chemical reaction and a nuclear reaction?
a
Which statement is true about the electrons in each polar bond of a water molecule?
a
Which substance is an example of a colloid?
a
Which substance will most likely ionize when it is dissolved in water?
a
Which two conditions can limit the usefulness of the kinetic-molecular theory in describing gas behavior?
a
Which type of reaction occurs in the following? 2HgO(s) mc014-1.jpg 2Hg(l) + O2(g)
a
Why does a plastic bottle that is sealed at a high altitude change its shape when it is taken to a low altitude?
a
At what temperature is the boiling point of this substance?
at 120°C
An empty plastic bottle is sealed in a cool room and then moved to a very hot room. What can best be stated about the air pressure inside the bottle when the bottle reaches room temperature?
b
Carla makes a small cardboard boat and floats it in a tub of water. When she adds a drop of dish soap behind the boat, the boat moves forward. Which statement best explains what happened?
b
Consider the hydrate below. FeCl3•6H2O Which part of the formula comes first in the name of the compound?
b
How many atm are in 1,520 mmHg?
b
The absolute temperature of a gas is increased four times while maintaining a constant volume. What happens to the pressure of the gas?
b
The balanced chemical equation for the reaction of copper (Cu) and silver nitrate (AgNO3) is shown below. Cu + 2AgNO3 mc001-1.jpg 2Ag + Cu(NO3)2 How many moles of copper must react to form 3.50 mol of Ag?
b
The reaction below shows how silver chloride can be synthesized. AgNO3 + NaCl mc017-1.jpg NaNO3 + AgCl How many moles of silver chloride are produced from 15.0 mol of silver nitrate?
b
What are thermal plasmas?
b
What is produced on the top of a pool of water by the mutual attraction between water molecules?
b
What is the empirical formula for C2H6?
b
What is used up in and stops a chemical reaction?
b
Which is the most important question for deciding if a chemical reaction has occurred?
b
Which molecules would most likely cause a liquid to have the lowest viscosity?
b
Which statement best describes the formation of a solution?
b
Why did Becquerel expose uranium crystals to sunlight in his initial experiment?
b
A chemical reaction in which one element replaces another element in a compound can be categorized as a
c
Consider the equation below. N2 + 3H2 mc011-1.jpg 2NH3 What is the mole ratio of hydrogen to ammonia?
c
Consider the reaction below. 2H2O mc030-1.jpg 2H2 + O2 How many moles of hydrogen are produced when 6.28 mol of oxygen form?
c
Disproportionation is a process in which a substance
c
In a chemical reaction occurring in an open beaker, the reactants have a mass of 10.0 g and contain 1000 J of energy. The products in the beaker contain a mass of 5.0 g and 500 J of energy. Which best explains the difference in energy and mass as reactants are converted to products?
c
The chemical equation below shows the decomposition of nitrogen triiodide (NI3) into nitrogen (N2) and iodine (I2). 2NI3 mc030-1.jpg N2 + 3I2 The molar mass of I2 is 253.80 g/mol, and the molar mass of NI3 is 394.71 g/mol. How many moles of I2 will form 3.58 g of NI3?
c
The chemical formula below shows how salt is produced. HCl + NaOH mc004-1.jpg NaCl + H2O Which substances are the reactants?
c
The mole concept will most likely be used in
c
The osmotic pressure of a solution increases as
c
What happens to energy when Sally kicks a soccer ball?
c
What is the formula equation for the reaction between sulfuric acid and dissolved sodium hydroxide if all products and reactants are in the aqueous or liquid phase?
c
What is the molar mass of Al2(SO4)3?
c
What is the most important reason for using hydrates in fire extinguishers?
c
Which equation represents the combined gas law?
c
Which identifies an oxidation-reduction reaction?
c
Which is a cause of polarity in water molecules?
c
Which is a characteristic of a homogeneous mixture that is a liquid?
c
Which question must be answered to complete the table below?
c
Which solution is the most concentrated?
c
Which state of matter is characterized by ionized particles, no definite shape or volume, and good electrical conductivity?
c
A 13.00 g sample of citric acid reacts with an excess of baking soda as shown in the equation. What is the theoretical yield of carbon dioxide?
d
In the following atomic model, where does the strong nuclear force happen?
d
Substance X has a fixed volume, and the attraction between its particles is strong. Substance Y has widely spread out particles and can be compressed. What can most likely be concluded about these substances?
d
The particles in water have less mobility than the particles in oxygen. Which statement best explains this observation?
d
The presence of which reactant is the best indicator of an oxidation-reduction reaction?
d
What is the simplest whole-number ratio of atoms in a molecule or formula unit called?
d
Which best describes a hydrate?
d
Which best describes the Tyndall effect?
d
Which formula represents a double displacement reaction?
d
Which is the molar mass of BF3?
d
Which is the molar mass of H2O?
d
Which postulate of the kinetic-molecular theory applies to the particles of a liquid?
d
Which statement is correct about the law of conservation of energy?
d
Which diagram represents the phase that occurs after a solid melts?
diagram 1
As gravity makes an object fall down toward the ground, energy becomes kinetic energy.
potential
The incomplete table below shows selected characteristics of gas laws. Which constants would most likely be filled in the first row of the table?
temperature and moles of gas
A container holds 6.4 moles of gas. Hydrogen gas makes up 25% of the total moles in the container. If the total pressure is 1.24 atm. What is the partial pressure of hydrogen?
0.31 atm
How many grams of N2 are required to produce 100.0 L of NH3 at STP?
62.5 g
A beaker contains a solution. A single solute crystal is added to the solution. Immediately, crystals form in the solution. Which term best describes the solution before the crystal was added?
a
A chemical reaction has two elements as reactants. Which type of reaction might occur?
a
A group of students are wandering around a room. When their teacher claps, the students sit down wherever they are. This situation best models the formation of which type of solid?
a
A stock solution is made by dissolving 66.05 g of (NH4)2SO4 in enough water to make 250 mL of solution. A 10.0 mL sample of this solution is then diluted to 50.0 mL. Given that the molar mass of (NH4)2SO4 is 132.1 g/mol, what is the concentration of the new solution?
a
A student placed equal volumes of honey and of water in two, identical, open dishes, and left them at room temperature for 8 hours. She observed that the amount of water decreased, but the amount of honey seemed unchanged. Knowing that honey is a highly concentrated solution of sugar in water, which statement should the student make to explain this phenomenon?
a
Consider the generic chemical equation below. X + Ymc021-1.jpg W + Z Reactant X contains 199.3 J of chemical energy. Reactant Y contains 272.3 J of chemical energy. Product W contains 41.9 J of chemical energy. If the reaction loses 111.6 J of chemical energy as it proceeds, how much chemical energy must product Z contain?
a
Consider the reaction below. mc005-1.jpg Which half reaction correctly describes the reduction that is taking place?
a
During a lesson in physical science about changes of matter, students made ice cream. Among the materials that are required to make ice cream is salt. Which answer choice best explains the role of salt in this activity?
a
During an experiment, Mr. Lehman tells his students to be alert for signs that an endothermic reaction is happening. Which of the following scenarios would his students most likely observe?
a
During an experiment, a student observes the formation of a precipitate. Why does this indicate that a chemical reaction is likely occurring?
a
How can a scientist assess whether a pure niobium (Nb) sample is responsible for contaminating the lab with radioactivity?
a
In the late 1890s, what objection might have been raised about Becquerel's claim that the uranium salt crystals had emitted something that exposed the photographic film?
a
In which process do ionic compounds separate into their oppositely charged constituent ions when they are dissolved in water?
a
Keisha makes a table to compare plasmas and solids. Which labels belong in the cells marked X and Y?
a
Many radioactive atoms that have large masses undergo radioactive decay by releasing a particle that is identical to a helium-4 nucleus. What changes in the original atom are expected as a result of this natural phenomenon?
a
MnO2 (s) + 4H+(aq) + 2Clmc007-1.jpg (aq) mc007-2.jpg Mn2+(aq) + 2H2O(l) + Cl2(g)
a
Propane (C3H8), a fuel that is used in camp stoves, produces carbon dioxide (CO2) and water vapor (H2O) on combustion as follows. Given that the molar mass of H2O is 18.02 g/mol, how many liters of propane are required at STP to produce 75 g of H2O from this reaction?
a
The chemical equation below shows the photosynthesis reaction. 6CO2 + 6H2O mc010-1.jpg C6H12O6 + 6O2 The molar mass of carbon dioxide (CO2) is 44.01 g/mol. The molar mass of water (H2O) is 18.01 g/mol. A reaction uses 528 g of CO2. How many moles of water are used in this reaction?
a
The closeness of particles of gas and their low speeds allow intermolecular forces to become important at certain pressures and temperatures. Which best describes this statement?
a
The repeating subunits that are responsible for the shape of a crystal are known as
a
Which energy change best relates to a boulder that is rolling down the side of a hill?
a
Which equation is a half reaction that describes the reduction that is taking place?
a
Which form of energy is directly related to the measure of the average kinetic energy of the particles in a substance?
a
Which graph correctly shows the effect on the freezing point caused by increasing the molality of a solution ?
a
Which is a characteristic of a nonelectrolyte?
a
Which is a way to express concentration of a solution?
a
Which is the best example of potential energy?
a
Which is the best example of water regulating an organism's body temperature?
a
Which method would increase the solubility of a gas?
a
A baker touches a pie right after taking it out of the oven. Which statement best explains why the pie feels hot?
b
A baseball player hits a ball. Which is the best description of the energy of the ball as it flies over the pitcher's head?
b
A gas cylinder contains 2.0 mol of gas X and 6.0 mol of gas Y at a total pressure of 2.1 atm. What is the partial pressure of gas Y?
b
A sample of hydrated calcium sulfate has a mass of 20.88 g. After it is heated, it has a mass of 16.51 g. What is the percentage by mass of water in the hydrate?
b
A student has a sample of isopropanol (C3H7OH) that has a mass of 78.6 g. The molar mass of isopropanol is 60.1 g/mol. How many moles of isopropanol are contained in this sample?
b
Consider the combustion reaction for acetylene. 2C2H2(l) + 5O2(g) mc001-1.jpg 4CO2(g) + 2H2O(g) If the acetylene tank contains 37.0 mol of C2H2 and the oxygen tank contains 81.0 mol of O2, what is the limiting reactant for this reaction?
b
Consider the redox reaction below. mc009-1.jpg Which half reaction correctly describes the oxidation that is taking place?
b
Consider the unbalanced equation for the oxidation of butene. C4H8 + 6O2 mc022-1.jpg CO2 + H2O For each molecule of C4H8 that reacts, how many molecules of carbon dioxide and water are produced?
b
How many moles of Ba(NO3)2 are there in 0.25 L of a 2.00 M Ba(NO3)2 solution?
b
How would the vapor pressure of a solution that contains 0.5 mol of CaCl2 in 1.0 kg of water compare with the vapor pressure of a solution that contains 1.5 mol of glucose in 1.0 kg of water?
b
If a scientist took a Geiger counter into a laboratory and measured a very high reading, this would indicate that
b
If gas particles start colliding with the walls of their metallic container with increased force, what is their direct effect?
b
If the atmospheric pressure on the top of a mountain is 0.2396 atm, what is the pressure in kilopascal (kPa)?
b
Image A: a roasting marshmallow Image B: melting ice Which statement about the two images is true?
b
In reaction A, each sodium atom gives one electron to a chlorine atom. In reaction B, an isotope of oxygen decays to form an isotope of nitrogen. Which statement best describes the energy that is released per gram by these reactions?
b
Liquids and solids are referred to as "condensed phases" because the attractive forces
b
Mixture A was made by mixing different components together, but it appears to have one phase. Which term best categorizes mixture A?
b
Propane burns in air to produce carbon dioxide and water. What is this type of chemical reaction called?
b
The Haber process can be used to produce ammonia (NH3) from hydrogen gas (H2) and nitrogen gas (N2). The balanced equation for this process is shown below. 3H2 + N2 mc025-1.jpg 2NH3 The molar mass of NH3 is 17.03 g/mol. The molar mass of H2 is 2.0158 g/mol. In a particular reaction, 0.575 g of NH3 forms. What is the mass, in grams, of H2 that must have reacted, to the correct number of significant figures?
b
The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide (MgO). 2Mg + O2 mc019-1.jpg 2MgO Niven wants to calculate the mass of MgO that is produced by the burning of 28.0 g of Mg. What is the first step in Niven's calculation?
b
The chemical equation for the formation of ammonia is unbalanced. 3H2(g) + N2(g) mc020-1.jpg NH3(g) If three molecules of hydrogen react with one molecule of nitrogen, how many molecules of ammonia would be formed?
b
The freezing point of pure chloroform is -63.5°C, and its freezing point depression constant is 4.07°C•kg/mol. If the freezing point of a solution of benzoic acid in chloroform is -70.55°C, what is the molality of this solution?
b
The temperature of a sample of liquid water changes from 50°C to 30°C. Which statement best explains the change that must happen at the molecular level?
b
The web site of the Nobel Prize explains that readers who want to inspect the Curies' notebooks must sign a paper that states that they are aware of the health risks that are involved with handling the notebooks. What health risk is most likely to occur from handling the notebooks?
b
Under which conditions would the solubility of a gas be greatest?
b
Valerie wants to examine the properties of a thick liquid but is finding it difficult to pour the liquid into a beaker. She needs to finish her investigation before the end of class. Which method will allow her to pour the liquid easily?
b
Webb has calculated the percent composition of a compound. How can he check his result?
b
What is the empirical formula for a compound if a sample contains 1.0 g of S and 1.5 g of O?
b
What is the most penetrating kind of radiation product that can be shielded with aluminum foil?
b
Which best explains why water has a high specific heat?
b
Which can have either a positive charge or a negative charge when they are released during radioactive decay?
b
Which indicator most likely suggests that a chemical change is taking place?
b
Which is a characteristic of a decomposition reaction?
b
Which is a characteristic of a solution?
b
Which is a characteristic of a weak electrolyte?
b
Which is an example of a plasma that occurs in nature?
b
Which reactants would lead to a spontaneous reaction?
b
Which statement about electrolytes and nonelectrolytes is not true?
b
Which statement best describes the collisions of gas particles according to the kinetic-molecular theory?
b
Which statement is true of the following reaction? mc011-1.jpg
b
Which type of chemical reaction occurs in C6H12 + 9O2 mc031-1.jpg 6CO2 + 6H2O?
b
Which word equation shows hydrogen reacting with oxygen to form water?
b
Why are liquids well suited for hydraulics?
b
A sample of a hydrate has a mass of 5.026 g. After it is heated, it has a mass of 3.492 g. What is the percentage by mass of water in the hydrate?
c
A solid is stirred into a liquid and dissolves. Which type of mixture forms?
c
A student stirs 2 tablespoons of honey into a glass of water. How will the addition of honey affect the water's colligative properties?
c
A substance is made up of slow-moving particles that have very little space between them. Based on this information, what can most likely be concluded about this substance?
c
Among these processes, which is the slowest chemical reaction?
c
An arrow is fired at a target on a high wall. Which statement correctly describes the change in the energy of the arrow as it moves toward the target?
c
An atom that has 84 protons and 86 neutrons undergoes a reaction. At the end of the reaction, it has 82 protons and 84 neutrons. What happened to the atom?
c
Chandra wants to know how many moles are contained in 150.0 g CCl4 (carbon tetrachloride). What quantity of CCl4 should she use to make this conversion?
c
Consider the equation below. AgNO3(aq) + NaCl(aq) mc007-1.jpg AgCl(s) + NaNO3(aq) Which compound is the precipitate in this chemical reaction?
c
Consider the following equilibrium reaction. mc008-1.jpg The forward reaction is non-spontaneous. What does this indicate about the relative strengths of the reducing and oxidizing agents on each side of the equation?
c
Consider the reaction below. 2Al2O3 mc031-1.jpg 4Al + 3O2 How many moles of oxygen are produced when 26.5 mol of aluminum oxide are decomposed?
c
Equations can be balanced by using the half-reaction method. Which step should be completed immediately after finding the oxidation states of atoms?
c
Given the reaction below, which is the oxidized substance? Mg + Cl2 mc005-1.jpg Mg2+ + 2Clmc005-2.jpg
c
Glycerol boils at a higher temperature than water. What does this indicate about the attractive forces of glycerol?
c
How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen?
c
In a disproportionation reaction, the disproportionate substance
c
In a group assignment, students are required to fill 10 beakers with 0.720 M CaCl2. If the molar mass of CaCl2 is 110.98 g/mol and each beaker must have 250. mL of solution, what mass of CaCl2 would be used?
c
In a school's laboratory, students require 50.0 mL of 2.50 M H2SO4 for an experiment, but the only available stock solution of the acid has a concentration of 18.0 M. What volume of the stock solution would they use to make the required solution?
c
Mercury(II) oxide (HgO) decomposes to form mercury (Hg) and oxygen (O2). The balanced chemical equation is shown below. 2HgO mc020-1.jpg 2Hg + O2 The molar mass of HgO is 216.59 g/mol. The molar mass of O2 is 32.00 g/mol. How many moles of HgO are needed to produce 250.0 g of O2?
c
Review the equation below. 2KClO3 mc012-1.jpg 2KCl + 3O2 How many moles of oxygen are produced when 2 mol of potassium chlorate (KClO3) decompose?
c
Temperature depends on the average kinetic energy of the particles in a sample. How does this help with explaining why a plasma-based light does not have a high temperature?
c
The diagram below shows the temperature dropping from 80°C to 20°C. Molecules that have longer arrows are moving faster. Which statement describes what is happening in this system?
c
The water in a 150-mL flask is poured into a beaker that contains 600 mL of ethyl alcohol. Which substance is the solvent in this mixture?
c
This formula equation is unbalanced. P4(s) + Cl2(g) mc030-1.jpg PCl3(l) Which coefficient should be placed in front of PCl3 to balance this equation?
c
Two different liquids are mixed together. Which observation indicates that an exothermic chemical reaction has taken place?
c
Under which conditions will sugar most likely dissolve fastest in a cup of water?
c
What are the variables in Gay-Lussac's law?
c
What does a strong nuclear force do in an atom?
c
What is the nuclear binding energy of an atom that has a mass defect of 5.0446 mc016-1.jpg 10-29 kg? Use E = mc2. (Remember: The speed of light is approximately 3.00 mc016-2.jpg 108 m/s.)
c
What is the overall reduction potential for the reaction mc025-35.jpg
c
What is the percent yield of ferrous sulfide if the actual yield is 220.0 g and the theoretical yield is 275.6 g?
c
What is the solubility of Na2HAsO4 at 60°C?
c
What is thermal energy?
c
What was Becquerel studying when he discovered radioactivity?
c
When does carbon dioxide absorb the most heat energy?
c
Which answer choice best explains why nuclear reactions release more energy than chemical reactions?
c
Which best describes the oxidizing agent in this reaction? Cl2(aq) + 2Brmc003-1.jpg(aq) mc003-2.jpg 2Clmc003-3.jpg(aq) + Br2(aq)
c
Which best explains why a crystal is incompressible?
c
Which best specifies the function of hydrates in a wound dressing?
c
Which conditions are equal to STP?
c
Which elements did the Curies discover?
c
Which example best shows that the chemistry of water is helpful to plants?
c
Which force is most responsible for binding together an atom's protons and neutrons?
c
Which is an example of the kinetic-molecular theory not holding true for a gas?
c
Which is an important step in the alternate method for balancing equations in redox reactions?
c
Which is true about the dissolving process in water?
c
Which of the following is a nonelectrolyte?
c
Which products are formed when aluminum is added to a silver chloride solution?
c
Which products would form if chlorine gas was bubbled through a solution of sodium bromide?
c
Which refers to a mixture that contains more than one phase in which the characteristics of the particles vary throughout the mixture?
c
Which statement best explains the symbol [NaCl]?
c
Which statement best relates an empirical formula with a molecular formula?
c
Which statement correctly compares chemical reactions with nuclear reactions?
c
Which symbol can be used to indicate the pressure at which a chemical reaction is carried out?
c
Which value gives the number of particles in 1 mol of a substance?
c
While a certain isotope decays, it emits photons. What kind of decay is happening?
c
Decomposition of potassium chlorate (KClO3) produces potassium chloride (KCl) and pure oxygen (O2). The balanced equation for the reaction is as follows. What volume of oxygen gas is released at STP if 10.0 g of potassium chlorate is decomposed? (The molar mass of KClO3 is 122.55 g/mol.)
c`
A chemist has 2.0 mol of methanol (CH3OH). The molar mass of methanol is 32.0 g/mol. What is the mass, in grams, of the sample?
d
A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place over the next few minutes?
d
A lab has 60 mL of a solution of uranium sulfate dissolved in water. Based on the work done by the Curies, how can the amount of radioactivity be reduced?
d
A sample of a compound contains 32.0 g C and 8.0 g H. Its molar mass is 30.0 g/mol. What is the compound's molecular formula?
d
A scientist is measuring the pressure that is exerted by each of the following gases in the atmosphere: carbon dioxide, oxygen, and nitrogen. Which term most likely describes what she is measuring?
d
According to the equation 2Na + 2H2O mc012-1.jpg 2NaOH+H2, what mass of Na is required to yield 22.4 L of H2 at STP? (The atomic mass of Na is 22.99 u.)
d
Consider the balanced equation. N2 + 3H2 mc033-1.jpg 2NH3 What is the percent yield of NH3 if the reaction of 26.3 g of H2 produces 79.0 g of NH3?
d
Consider the chemical equation. CuCl2 + 2NaNO3 mc023-1.jpg Cu(NO3)2 + 2NaCl What is the percent yield of NaCl if 31.0 g of CuCl2 reacts with excess NaNO3 to produce 21.2 g of NaCl?
d
Deuterium is an isotope of hydrogen. The nucleus of a deuterium atom consists of one proton and one neutron. When two deuterium nuclei fuse, helium-3 is formed, and a neutron is emitted. Which equation illustrates this process?
d
Equal amounts of four gases are placed in identical containers at the temperatures that are noted below. Molecules of which gas would exert the greatest collision force?
d
Five gases combined in a gas cylinder have the following partial pressures: 3.00 atm (N2), 1.80 atm (O2), 0.29 atm (Ar), 0.18 atm (He), and 0.10 atm (H). What is the total pressure that is exerted by the gases?
d
Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. What is the formula equation for this reaction?
d
For an experiment, a student needs a compound that has the following properties. • It dissolves in water. • It is an electrolyte. • It is excellent conductor of electricity. Which substance would be the best choice for the experiment?
d
Given that the molar mass of NaNO3 is 85.00 g/mol, what mass of NaNO3 is needed to make 4.50 L of a 1.50 M NaNO3 solution?
d
How are anhydrous compounds often used in various toy products?
d
How are energy and mass connected during the formation of an atom?
d
In a chemical equation, which symbol should be used to indicate that a substance is in solution?
d
Passing an electric current through a sample of water (H2O) can cause the water to decompose into hydrogen gas (H2) and oxygen gas (O2) according to the following equation. 2H2O mc026-1.jpg 2H2 + O2 The molar mass of H2O is 18.01 g/mol. The molar mass of O2 is 32.00 g/mol. What mass of H2O, in grams, must react to produce 50.00 g of O2?
d
The balanced chemical equation for the reaction of hydrogen and oxygen is shown below. 2H2 + O2 mc002-1.jpg 2H2O The number of moles of hydrogen that is needed to produce 0.253 mol of water is
d
The electrolysis of water forms H2 and O2. 2H2O mc017-1.jpg 2H2 + O2 What is the percent yield of O2 if 10.2 g of O2 is produced from the decomposition of 17.0 g of H2O?
d
The empirical formula for a compound is CH2. If n is a whole number, which shows a correct relationship between the molecular formula and the empirical formula?
d
The equation below shows hydrogen reacting with oxygen to produce water. 2H2 + O2 mc028-1.jpg 2H2O If 16 mol of oxygen were reacted with excess hydrogen gas, how many moles of water would be produced?
d
Two different gases are stored in separate closed containers. If both gases have a temperature of 50°C, which statement is true?
d
Water can resist a greater external force than ethanol can. Which statement best describes this difference?
d
What is included in the name of a hydrate to indicate the amount of water present?
d
What is the best description of what Becquerel observed in his experiment?
d
What is the molar volume of a gas at standard temperature and pressure?
d
What is the oxidation number for S in the compound SO3? (Recall that O has an oxidation number of -2.)
d
What is the volume of 2 mol of chlorine gas at STP?
d
What was an important difference between the crystals that Becquerel exposed to sunlight and the crystals that he kept in the drawer?
d
Which application of hydrates relies on the anhydrous compound's ability to absorb water?
d
Which best explains the high surface tension of water?
d
Which best explains the relationship between evaporation and temperature?
d
Which equation describes a reduction?
d
Which half-reaction correctly describes an oxidation?
d
Which is an example of dissociation?
d
Which is the formula mass of (NH4)2SO4?
d
Which low-energy state of condensed matter is characterized by structural rigidity and resistance to changes of shape or volume?
d
Which step will decrease the pressure of a gas inside a closed cubical container?
d
Which term best describes the role of hydrogen gas in the formation of a water molecule?
d
Which type of reaction occurs in the following equation? mc017-1.jpg
d
Two samples of carbon come into contact. Heat will transfer from Sample A to Sample B if the average kinetic energy of Sample A's atoms is the average kinetic energy of Sample B's atoms.
greater than
