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WorksheetsChemistry Final exam
Total questions: 60
Worksheet time: 3600secs
The mass of a mole of NaCl is the ____.
atomic mass
molar mass
gram atomic mass
molecular mass
What SI unit is used to measure the number of representative particles in a substance?
mole
kilogram
ampere
kelvin
Avogadro's number of representative particles is equal to one ____.
kilogram
mole
kelvin
gram
The molar mass of a gas can be determined from which of the following?
the density of the gas at STP
Its mass and volume at known conditions
Avogadro's number
none of the above
Which of the following elements is a halogen?
oxygen
fluorine
argon
neon
What is the charge of an electron?
variable
positive
negative
neutral
Which of the following is a noble gas?
oxygen
nitrogen
hydrogen
helium
Which of the following elements is an alkali metal?
aluminum
lithium
argon
calcium
What is the charge of a proton?
negative
neutral
positive
variable
Which of the following is a property of noble gases?
metallic luster
low boiling points
high reactivity
high density
What is the molar mass of a substance?
The mass of one molecule in grams
The mass of one mole of the substance in grams
The number of atoms in a mole
The volume occupied by one mole of a gas
The mole allows chemists to:
Count particles by weighing them
Measure temperature changes
Determine the speed of molecules
Predict colors of compounds
What is Avogadro’s number?
1.00 × 10³
3.14 × 10⁶
6.02 × 10²³
9.81 × 10²
The mole is a unit used to measure:
Mass
Volume
Amount of substance
Temperature
Chemical reactions ____.
occur only in living organisms
create and destroy atoms
only occur outside living organisms
produce new substances
Chemical equations ____.
describe chemical reactions
show how to write chemical formulas
give directions for naming chemical compounds
describe only biological changes
Chemical equations must be balanced to satisfy ____.
the law of definite proportions
the law of multiple proportions
the law of conservation of mass
Avogadro's principle
In a combustion reaction, one of the reactants is .
hydrogen
nitrogen
a metal
The products of a combustion reaction do NOT include .
carbon dioxide
carbon monoxide
hydrogen
Which of the following is a characteristic of a combustion reaction?
It involves the exchange of ions between two compounds.
It always produces carbon dioxide and water.
It requires a catalyst to proceed.
It occurs only in the presence of a metal.
What is the role of a catalyst in a chemical reaction?
It changes the products of the reaction.
It lowers the activation energy of the reaction.
It is consumed during the reaction.
It increases the temperature of the reaction.
In a balanced chemical equation, the number of atoms of each element is ____.
greater on the product side
not important
equal on both sides
greater on the reactant side
In this chemical equation, the elements in red are the_______.
Products
Reactants
Subscripts
Coefficients
Which of the following is a characteristic of a decomposition reaction?
It always produces water and carbon dioxide.
It involves the combination of two or more substances.
It requires a catalyst to proceed.
It results in the breakdown of a compound into simpler substances.
What is the role of heat in a chemical reaction?
It increases the rate of the reaction by providing energy.
It acts as a reactant.
It is a product of all chemical reactions.
It is always required for a reaction to occur.
Which of the following statements is true about the law of conservation of mass?
Mass is neither created nor destroyed in a chemical reaction.
Mass is destroyed during a chemical reaction.
Mass is created during a chemical reaction.
Mass is only conserved in physical changes.
Why is a gas easier to compress than a liquid or a solid?
Its volume increases more under pressure than an equal volume of liquid does.
Its volume increases more under pressure than an equal volume of solid does.
The space between gas particles is much less than the space between liquid or solid particles.
The volume of a gas’s particles is small compared to the overall volume of the gas.
Why does the pressure inside a container of gas increase if more gas is added to the container?
There is an increase in the number of collisions between particles and the walls of the container.
There is an increase in the temperature of the gas.
There is a decrease in the volume of the gas.
There is an increase in the force of the collisions between the particles and the walls of the container.
How does the gas propellant move when an aerosol can is used?
from a region of high pressure to a region of lower pressure
from a region of high pressure to a region of equally high pressure
from a region of low pressure to a region of higher pressure
from a region of low pressure to a region of equally low pressure
If the volume of a container of gas is reduced, what will happen to the pressure inside the container?
The pressure will increase.
The pressure will not change.
The pressure will decrease.
The pressure depends on the type of gas.
If a balloon is squeezed, what happens to the pressure of the gas inside the balloon?
It increases.
It stays the same.
It decreases.
The pressure depends on the type of gas in the balloon.
What happens to the temperature of a gas when it is compressed?
The temperature increases.
The temperature does not change.
The temperature decreases.
The temperature becomes unpredictable.
As the temperature of the gas in a balloon decreases, which of the following occurs?
The volume of the balloon increases.
The average kinetic energy of the gas decreases.
The gas pressure inside the balloon increases.
all of the above
What happens to the pressure of a gas inside a container if the temperature of the gas decreases?
The pressure increases.
The pressure does not change.
The pressure decreases.
The pressure cannot be predicted.
Why does air escape from a tire when the tire valve is opened?
The pressure outside the tire is lower than the pressure inside the tire.
The pressure outside the tire is greater than the pressure inside the tire.
The temperature is higher outside the tire than inside the tire.
There are more particles of air outside the tire than inside the tire.
When the Kelvin temperature of an enclosed gas doubles, the particles of the gas ____.
move faster
strike the walls of the container with less force
decrease in average kinetic energy
decrease in volume
The volume of a gas is doubled while the temperature is held constant. How does the gas pressure change?
It is reduced by one half.
It does not change.
It is doubled.
It varies depending on the type of gas.
Boyle's law states that ____.
the volume of a gas varies inversely with pressure
the volume of a gas varies directly with pressure
the temperature of a gas varies inversely with pressure
the temperature of a gas varies directly with pressure
Charles's law states that ____.
the pressure of a gas is inversely proportional to its temperature in kelvins
the volume of a gas is directly proportional to its temperature in kelvins
the pressure of a gas is directly proportional to its temperature in kelvins
the volume of a gas is inversely proportional to its temperature in kelvins
If a balloon is heated, what happens to the volume of the air in the balloon if the pressure is constant?
It increases.
It stays the same.
It decreases.
The change cannot be predicted.
As the temperature of a fixed volume of a gas increases, the pressure will ____.
vary inversely
decrease
not change
increase
What happens when a piston is used to decrease the volume of a contained gas?
Fewer gas particles exert a force on the piston.
The piston's pressure on the gas becomes greater than the pressure exerted by the gas on the piston.
Gas particles become compressed.
Gas particles leak out of the container.
If the volume of a container of air is reduced by one-half, what happens to the partial pressure of oxygen within the container?
It is reduced by one-half.
It does not change.
It is doubled.
It is reduced by one-fourth.
What is the SI unit of pressure?
pascal
mole
candela
newton
Which of the following statements is part of the kinetic theory?
The particles in a gas are relatively far apart.
The particles in a gas move rapidly.
The particles of a gas move independently of each other.
All of the above
Which states of matter can flow?
gases only
gases, liquids, and solids
liquids only
gases and liquids only
What instrument is normally used to measure atmospheric pressure?
barometer
manometer
thermometer
vacuum
What happens to the temperature of a liquid as it evaporates?
It decreases.
The change cannot be determined.
It increases.
It does not change.
How does the atmospheric pressure at altitudes below sea level compare with atmospheric pressure at sea level?
The pressures are the same.
The atmospheric pressure below sea level is lower.
Differences in pressures cannot be determined.
The atmospheric pressure below sea level is higher.
Which of the following statements is NOT true, according to the kinetic theory?
The particles of a gas collide with each other and with other objects.
There is no attraction between particles of a gas.
Only particles of matter in the gaseous state are in constant motion.
All of the statements are true.
Which of the following is an example of a phase?
pressure
temperature
triple point
water vapor
The direct change of a substance from a solid to a gas is called ____.
sublimation
evaporation
condensation
solidification
The temperature at which the motion of particles theoretically ceases is ____.
–273 K
273°C
0°C
0 K
The escape of molecules from the surface of a liquid is known as ____.
evaporation
boiling
sublimation
condensation
Most solids _____
have a disorderly structure
are amorphous
are able to flow
are dense and difficult to compress
When the vapor pressure of a liquid is equal to the atmospheric pressure, the liquid _____
boils vigorously.
begins to boil.
has no observable changes.
evaporates.
With which temperature scale is temperature directly proportional to average kinetic energy?
Kelvin
Fahrenheit
centigrade
Celsius
