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Reactions
Phases of Matter
Atoms & Compounds
Substances
Vocabulary
100

Evidence that a chemical reaction has occurred is...(Name at least 3)

Bubbling, color change, temperature change, new substances formed.

100
The phase of matter in which the particles travel the fastest and the farthest apart.
Gas!
100

Air can be found between the atoms that make up a substance. True or False?

False

100

What is a substance? Give a SPECIFIC example.

Everything. O, H2O, He, NaCl...

100

Starting substances in a chemical reaction are called

reactants

200

What is a chemical reaction?

When starting substances change into new, different substances.

200
The phase of matter in which an object will melt.
Solid!
200

When atoms of 2+ kinds bond, they are called

Compounds

200
What is a particle? Give a SPECIFIC example?
Everything. O, H2O, He, NaCl...
200

New products created by a chemical reaction are called

Products

300

What happens to atoms when a chemical reaction occurs?

They rearrange. (are not created or destroyed)

300
The phase of matter in which an object will sublime.
Solid!
300

When 2+ atoms are held together with a strong bond they are called

molecules
300
What is a single element? Give a SPECIFIC example.
One kind of element in a particle or substance. He, O2, Na...
300

When a chemical reaction is written out, what does a down arrow indicate?

Precipitate

400
True or false: A chemical reaction always occurs when substances combine?
False!
400
What happens to the particles in a solid block of lead as it melts?
The kinetic energy of the particles increases until the bonds are broken and they spread apart.
400
When 2+ atoms are held together with weak bonds they are called
ionic compounds
400

What is a compound? Give a SPECIFIC example.

Two or more elements in a particle or substance. H2O, NaCl...

400

When a chemical reaction is written out, what does an up arrow indicate

Gas was produced

500
Write an example of a chemical reaction using chemical formulas.
H2 + O2 = H2O
500
What happens when a volume of air is heated in a closed balloon?
The air particles move faster, the air particles hit each other more frequently, the air particles get farther apart, the air particles occupy more space.
500

What is found between atoms in a gas?

Nothing

500

Which is a chemical reaction, melting or dissolving?

Neither

500

The energy released into the environment by an exothermic reaction can be in the form of _______ or _______

Light or thermal energy