Vocabulary
The word that describes things that relate to science.
scientific
Can matter change from one state to another?
Yes, ma'am.
Molecules vibrate faster when any kind of ____ is added to them.
energy
When energy is lost, do molecules in matter slow down or speed up?
slow down
Frozen carbon dioxide is called:
dry ice
Give an example of an element.
Gold, mercury, oxygen, carbon, gallium, hydrogen, etc.
What is matter?
The physical part of the universe.
Molecules in matter are constantly moving back and forth. Scientists say the molecules are ____.
vibrating
When energy is lost, do molecules in matter move closer to each other or further apart?
move closer
Can you change solid dry ice to a gas again?
Yes.
What is gallium?
A soft, silvery gray metal that melts in your hand.
All matter is made up of _____.
atoms
An example of a type of energy that can change a solid into a liquid or a gas is:
the sun, an oven, an explosion, heat, etc.
Give an example of energy...
the sun, an oven, an explosion, electricity, etc...
To change frozen carbon dioxide to a gas, you just have to...
put it into a bucket of water.
What is an atom?
They make up all the matter (everything) in our universe. They are the smallest part of every element.
What are the three states of matter?
solid, liquid, or gas
In a solid, molecules vibrate ______ because they are ______.
slowly....packed tight together
If a liquid loses enough energy, what state does it become?
a solid
A compound is...
a combination of two or more different elements (1 hydrogen + 1 hydrogen + 1 oxygen = H20/water)
What is a molecule?
Two or more atoms joined together
gas
When energy is added or lost and the molecules change speed, this causes a ______.
phase change
Describe what happens to molecules when they change from:
1. solid to liquid
2. liquid to gas
3. liquid to solid
1. solid to liquid: molecules get faster and farther apart
2. liquid to gas: molecules get faster and farther apart
3. liquid to solid: molecules get slower and closer
Why would putting solid dry ice into warm water turn it into a gas?
The warm water adds energy to the molecules so they vibrate faster.