Gas can be compressed (squished into a smaller space) or expanded (spread out into a larger space) because we can change the amount of space between the particles therefore gas can be added and removed from a container that already contains a _____________.

The higher the ________________ the faster the molecules move.

Temperature is a ____________ of the average speed of the molecules.

When a substance is heated, the _____________ that make it up move faster. The faster movement of the molecules results in higher temperatures.

As temperature increases, the volume of the object increases. As temperature decreases, the ___________ of the object decreases.

Different materials have different properties because they are made of different __________________.

Air is a ____________ of different molecules.

Different arrangements of _____________ in molecules results in different properties.

thermometer - an instrument for ____________ temperature; usually measured in Celsius (oC) or Fahrenheit (oF)

temperature - an objective measurement of how hot or cold an object is; it is really measuring the average speed of the particles in an object - the hotter the object the ______________ the particles move.

deposition - when a substance __________ the condensing phase and changes from a gas state right into a solid state; removing energy so a substance goes from a gas to a solid

sublimation - when a substance skips the melting phase and changes from the solid state right into the gaseous state; adding energy so a substance goes from solid to ________

boiling point - a characteristic for a substance (so it doesn’t change if you have one bit or lots of and lots of bits) where the atoms for the liquid substance start to become a gas; once a liquid reaches its boiling point, it stays at the same temperature until it is completely ______________

melt- adding energy so a substance goes from solid to _________

freeze- removing energy so a substance goes from liquid to solid; it doesn’t have to be cold for an object to turn into a ____________

gas - a form of matter that does not have a definite volume or ______________

liquid - the state of matter that has a definite volume but not a definite __________

solid - the state of matter in which the volume and shape of a substance are _______________

change of state - the change of a substance from one state of matter to to another state of matter; the type of object you begin with (like milk) is the same type of object you end with just in another state of _______________

states of matter - the physical forms of ______________; the three we interact with daily are solid, liquid, and gas

Sublimation is when a ______________ changes directly to a ___________________ .

The process by which molecules at the surface of a liquid absorb enough energy to change to the gaseous state is called

A pot of water on the hot stove begins to boil rapidly. A glass lid is placed on the pot and water droplets begin forming on the inside of the lid. What best describes what happened?

What happens to the water molecules when the water at 24C is cooled to 0C and freezes?

You already know that gases take the shape of their container. As more gas is added to a

balloon, the pressure against the sides of the balloon ________________.

You have learned about the particles inside the balloon, but you know that ______ molecules are also moving in the room outside of the balloon.

What happens inside a popcorn kernel is related to the speed of particles, energy, temperature,

and pressure. True or false

In class you observed menthol. Menthol is a white solid with a strong odor. true or false

For humans to smell a material, some of the material has to be in the _______________ state.

Some people call carbon dioxide dry ice because in the solid

state it is very cold and looks like ice. In fact, it is even warmer than ice.

Particles in a gas are always

moving. true or false

As temperature increases, particles

move slower. true or false

As temperature increases, particles

move faster and their energy

increases.

Humans can smell about __________ different odors.

When you hold a tiny bit of menthol, you are holding

_____________ of menthol molecules.

The menthol you smelled in class can be found in the peppermint plant. A peppermint __________ also contains other substances that help to make it smell minty.

What happens to the water molecules when the water at 24C is cooled to 0C and freezes?

A pot of water on the hot stove begins to boil rapidly. A glass lid is placed on the pot and water droplets begin forming on the inside of the lid. What best describes what happened?

The process by which molecules at the surface of a liquid absorb enough energy to change to the gaseous state is called

Sublimation is when a ______________ changes directly to a ___________________ .

Sometimes it is more helpful to use a model with atoms represented by circles that touch.

Sometimes it is more helpful to see a model with letters and lines that connect them.

The ammonia particles in the warm water will reach the indicator paper first.