Question 1

Which of the following statements describes an exothermic reaction but not an endothermic reaction?

Accepted Answer

A)  Energy is destroyed during the reaction.
B)  Energy is used to form chemical bonds.
C)  Energy is used to break chemical bonds.
D)  Energy is released as heat during the reaction. D

Question 2

How many grams of KCl are dissolved in 2.00 L of a 0.200 M solution of KCl?

Accepted Answer

A)  0) 400 g
B)  14.9 g
C)  29.8 g
D)  400 g C

Question 3

Silver (Ag) has 47 protons in each atom. Based on this information, which of the following also describes an atom of silver

Accepted Answer

A)  It has no neutrons.
B)  It has 47 electrons.
C)  It has 23 neutrons and 24 electrons.
D)  It has a total of 94 neutrons and electrons. B

Question 4

Which of the following statements accurately describes alpha particles in terms of charge and mass?

Accepted Answer

A)  Alpha particles are positively charged and less massive than beta particles.
B)  Alpha particles are negatively charged and less massive than beta particles.
C)  Alpha particles are positively charged and more massive than beta particles.
D)  Alpha particles are negatively charged and more massive than beta particles.

Question 5

Block X and Block Y have the same mass. Both blocks are placed into a container of pure water. Block X ? oats in the water, and Block Y sinks to the bottom of the container. Which of the following statements is an accurate conclusion from this demonstration?

Accepted Answer

A)  Block Y is heavier than Block X.
B)  Block Y is less dense than Block X.
C)  Block Y has a smaller volume than Block X.
D)  Block Y would ?oat if more water were added.

Question 6

Block X and Block Y have the same mass. Both blocks are placed into a container of pure water. Block X ? oats in the water, and Block Y sinks to the bottom of the container. Which of the following statements is an accurate conclusion from this demonstration?

Accepted Answer

A)  Block Y is heavier than Block X.
B)  Block Y is less dense than Block X.
C)  Block Y has a smaller volume than Block X.
D)  Block Y would ?oat if more water were added.

Question 7

A gas enters a compressor where it is converted to a liquid. Which of the following happens to the gas as it becomes a liquid?

Accepted Answer

A)  It loses mass.
B)  It releases heat.
C)  It loses protons.
D)  It releases electricity.

Question 8

Which of the following activities could cause liquid molecules to overcome intermolecular attractive forces and become gas molecules?

Accepted Answer

A)  adding a solute to the liquid
B)  adding a catalyst to the liquid
C)  increasing the temperature of the liquid
D)  increasing the air pressure above the liquid

Question 9

Which of the following lists three states of water in order of increasing entropy?

Accepted Answer

A)  ice, liquid, vapor
B)  liquid, ice, vapor
C)  ice, vapor, liquid
D)  vapor, liquid, ice

Question 10

Which of the following trends in the periodic table should be expected as the atomic number of the halogens increases from fluorine (F) to iodine (I)?

Accepted Answer

A)  Atomic radius decreases.
B)  Electronegativity decreases.
C)  Atomic mass decreases.
D)  Electron number decreases.

Question 11

Based on its position on the periodic table, which of the following elements is a nonmetal?

Accepted Answer

A)  potassium (K) 
B)  vanadium (V) 
C)  nickel (Ni) 
D)  bromine (Br)

Question 12

Concrete is composed of Portland cement, rocks, sand, and water. Which of the following best describes concrete?

Accepted Answer

A)  an element
B)  a compound
C)  a homogenous mixture
D)  a heterogeneous mixture

Question 13

A hiker carries drinking water in a cloth-covered, metal container called a canteen. During the summer, the hiker wets the cloth covering so that the water in the canteen stays cool. Which of the following statements explains why a wet covering keeps the water cool?

Accepted Answer

A)  A wet covering transfers coolness to the water in the canteen.
B)  A wet covering insulates the canteen better than a dry covering.
C)  Evaporation of water from the covering transfers heat away from the canteen.
D)  Condensation of water from the covering transfers heat away from the canteen.

Question 14

The addition of 500 J of energy to a block of iron causes a rise in the average kinetic energy of the atoms in the block. Which of the following instruments can best be used to observe this change?

Accepted Answer

A)  a ruler
B)  a balance
C)  a thermometer
D)  a graduated cylinder

Question 15

A hiker carries drinking water in a cloth-covered, metal container called a canteen. During the summer, the hiker wets the cloth covering so that the water in the canteen stays cool. Which of the following statements explains why a wet covering keeps the water cool?

Accepted Answer

A)  A wet covering transfers coolness to the water in the canteen.
B)  A wet covering insulates the canteen better than a dry covering.
C)  Evaporation of water from the covering transfers heat away from the canteen.
D)  Condensation of water from the covering transfers heat away from the canteen.

Question 16

Formaldehyde in solution is used as a preservative. It has a melting point of -92°C. When the temperature of a sample of formaldehyde rises from -93°C to -91°C, which of the following occurs?

Accepted Answer

A)  The molecules move more freely.
B)  The molecules lose electrical charge.
C)  The molecules break apart into atoms.
D)  The molecules become fixed in a crystal structure.

Question 17

The three main types of nuclear radiation are alpha, beta, and gamma. Which of the following lists these types of radiation from highest penetrating power to lowest penetrating power?

Accepted Answer

A)  alpha, gamma, beta
B)  beta, alpha, gamma
C)  beta, gamma, alpha
D)  gamma, beta, alpha

Question 18

A student made a homogeneous mixture of water and salt. Which of the following statements applies to this homogeneous mixture?

Accepted Answer

A)  This mixture is a solution.
B)  This mixture is a pure substance.
C)  The salt is not evenly distributed throughout this mixture.
D)  The salt chemically combines with the water in this mixture.

Question 19

Which of the following correctly pairs a phase of matter with its description?

Accepted Answer

A)  Solid: Particles have no motion.
B)  Liquid: Particles expand to fill any container in which they are placed.
C)  Gas: Particles have higher amounts of energy than when in the liquid phase.
D)  Liquid: Particles are more strongly attached to one another than when in the solid phase.

Question 20

Which of the following describes the separation of the components of a mixture?

Accepted Answer

A)  Water is broken down into hydrogen and oxygen.
B)  Salt is isolated from seawater through evaporation.
C)  Propane reacts with oxygen to form carbon dioxide and water.
D)  Calcium carbonate decomposes to form calcium oxide and carbon dioxide.

Exam 2: Chemistry

Which of the following statements describes an exothermic reaction but not an endothermic reaction?

How many grams of KCl are dissolved in 2.00 L of a 0.200 M solution of KCl?

Silver (Ag) has 47 protons in each atom. Based on this information, which of the following also describes an atom of silver

Which of the following statements accurately describes alpha particles in terms of charge and mass?

Block X and Block Y have the same mass. Both blocks are placed into a container of pure water. Block X ? oats in the water, and Block Y sinks to the bottom of the container. Which of the following statements is an accurate conclusion from this demonstration?

Block X and Block Y have the same mass. Both blocks are placed into a container of pure water. Block X ? oats in the water, and Block Y sinks to the bottom of the container. Which of the following statements is an accurate conclusion from this demonstration?

A gas enters a compressor where it is converted to a liquid. Which of the following happens to the gas as it becomes a liquid?

Which of the following activities could cause liquid molecules to overcome intermolecular attractive forces and become gas molecules?

Which of the following lists three states of water in order of increasing entropy?

Which of the following trends in the periodic table should be expected as the atomic number of the halogens increases from fluorine (F) to iodine (I) ?

Based on its position on the periodic table, which of the following elements is a nonmetal?

Concrete is composed of Portland cement, rocks, sand, and water. Which of the following best describes concrete?

A hiker carries drinking water in a cloth-covered, metal container called a canteen. During the summer, the hiker wets the cloth covering so that the water in the canteen stays cool. Which of the following statements explains why a wet covering keeps the water cool?

The addition of 500 J of energy to a block of iron causes a rise in the average kinetic energy of the atoms in the block. Which of the following instruments can best be used to observe this change?

A hiker carries drinking water in a cloth-covered, metal container called a canteen. During the summer, the hiker wets the cloth covering so that the water in the canteen stays cool. Which of the following statements explains why a wet covering keeps the water cool?

Formaldehyde in solution is used as a preservative. It has a melting point of -92°C. When the temperature of a sample of formaldehyde rises from -93°C to -91°C, which of the following occurs?

The three main types of nuclear radiation are alpha, beta, and gamma. Which of the following lists these types of radiation from highest penetrating power to lowest penetrating power?

A student made a homogeneous mixture of water and salt. Which of the following statements applies to this homogeneous mixture?

Which of the following correctly pairs a phase of matter with its description?

Which of the following describes the separation of the components of a mixture?