Density
What is the formula for density?
Density = mass/volume
What happens to molecules movement when you transfer energy in?
They move faster
The process of changing from a solid to a liquid is...
Melting
Different substances can have different molecular attractions. (True/False)
True
the way molecules in a substance move around relative to each other
Freedom of movement
Find the density.
The mass of an object is 28g and the volume of the object is 4 mL. What is the density?
Marley put a jar with water outside. Hours later, the water had changed into water vapor.
Explain what phase change happened and how.
Molecules were moving around each other, moving away from each other.
Evaporation: liquid to gas
The process of changing from a liquid to a solid is...
Freezing
A gas has high kinetic energy, which means the molecular attraction will be....(high, medium, low)
Low
the energy that an object has because it is moving
Kinetic energy
Find the density.
The mass of an object is 100 g. The volume is 50mL. What is the density?
2 g/mL
If you increase the temperature what happens to molecules?
They move faster
The process of changing from a liquid to a gas is...
Evaporation
You have two substances. One has a strong attraction and one has a weak attraction. Both are liquids right now.
Which would you need to remove less energy to get it to change to a solid?
The one with the strong attraction
a pull between two molecules that is always the same for a substance
Molecular attraction
Find the density.
The mass of an object is 36g. The sides of a cube measure 3cm.
D= m/v
v= 3x3x3
v=12
D= 36/12
D= 3g/cm3
If you decrease the kinetic energy of molecules what happens to the movement?
They move slower
The process of changing from a solid to a gas is...
Sublimation
What happens to the molecular attraction during a phase change when kinetic energy decreases?
The molecular attraction increases.
something you can see with your naked eye
Macroscale
Find the density.
The mass of an object is 56g. The side of the cube is 4 cm.
v= 4 x 4 x4
v= 64
D= m/v
56g/64cm
D= 0.875 g/cm3
Identify the correct states of matter.
Before: molecules move around each other.
After: molecules spread around everywhere
Before: the substance was a liquid
After: the substance was a gas
The process of changing from a gas to a solid is...
Deposition
If you are adding energy to two liquids, one that has a weak attraction and one with a strong attraction, which would change to a gas first?
The one with a weak attraction
a noticeably different form or state of the same substance
Phase
Find the density.
The mass of an object is 72g and the volume is 9 mL.
8g/mL
At first the water was a liquid. After, it was a solid.
The process of changing from a gas to a liquid is...
Condensation
What happens to the molecular attraction during a phase change when kinetic energy increases?
The molecular attraction decreases.
Anything that has mass and takes up space is known as...
Matter