unit 2 test review. when an iron nail is ground into powder what happens to it’s mass? it stays...
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Unit 2 Test Review
When an iron nail is ground into powder what happens to it’s mass?
It stays the same
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.
A sample of gas occupies 17 mL at –112o C What volume does the sample occupy at 70o C?
= 36 mL17 mL X 343 K 161 K
What would happen to the pressure with the following change?
The temperature is increased.
Pressure increases
What would happen to the pressure with the following change?
The volume of the container is increased.
Pressure decreases
What would happen to the pressure with the following change?
More of the gas is added to the container.
Pressure increases
What would happen to the pressure with the following change?The average kinetic energy of the gas
in increased.
Pressure increases
What method would you use to determine the average kinetic energy of the molecules of water in a glass.?
measure the water’s temperature
Describe the movement of ideal gases according to the kinetic theory
Motion is constant, random, and rapid
During which intervals on the graph is the average kinetic energy of the molecules in the sample decreasing?
20-kg sample of a substance as it is cooled at a constant rate
A, C and E
How can you be CERTAIN that a chemical change has taken place?
Check the composition of the sample before and after the change.
What distinguishes a substance from a mixture?
Mixtures can be separated physically, while compounds cannot
Standard conditions when working with gases are defined as ____.
0o C and 101.3 kPa
What causes gas pressure in a container such as a helium balloon?
The collisions of fast-moving gas particles on the walls of the container
How are average kinetic energy of the particles and temperature of a substance related?
Kinetic energy is directly proportional to the temperature of the substance
Temperature is a measure of the average kinetic energy of the particles of a substance
Explain equilibrium vapor pressure.
In a closed container the rate of evaporation will equal the rate of condensation
As the temperature of the gas in a balloon decreases, what happens to each of the following?
volume
pressure
kinetic energy
decreases
decreases
decreases
Which state of matter is characterized by having an indefinite shape, but a definite volume?
liquid
Which state of matter is most dense?
solids
Which state of matter have the strongest intermolecular attractions
solids
Which state of matter has the most space between their particles
gas
Which state of matter expands when heated and is easy to compress?
gas
Describe an ideal gas
Small particles with no volumes or intermolecular attractions
Classify the following:.
table salt
air
nitrogen
gold
substance /compound
mixture / homogenous
substance / element
substance / element
Classify the following:.
water
stainless steel
noodle soup
oxygen
substance /compound
mixture / homogenous
mixture / heterogenous
substance / element
Identify the following as a homogeneous mixture or heterogenous mixture?
milk
oil and vinegar
air
vinegar in water
homogenous
heterogenous
homogenous
homogenous
Identify the following as a homogeneous mixture or heterogenous mixture?
salt water
beef stew
sand and water
soil
homogenous
heterogenous
heterogenous
heterogenous
Identify the following as a chemical property or physical property
color
hardness
ability to react
freezing point
physical
physical
chemical
physical
Identify the following as a chemical property or physical property
mass
density
ability to rust
melting point
physical
physical
chemical
physical
Identify the following as a physical or chemical change
corrosion
melting
food rotting
explosion
chemical
physical
chemical
chemical
Identify the following as a physical or chemical change
toasted bread
evaporating sea water
dissolving sugar in water
chemical
physical
physical
Identify the following as a physical or chemical change
gasoline burns
gasoline boils
oxygen is added to gasoline
chemical
physical
physical