Chaptar 3 Unit Test Flashcards
1
Q
Pure Substance
A
Constant chemical composition
2
Q
How does a compound form
A
Through chemical bonds
3
Q
Covalent compounds
A
Share electrons
4
Q
Ionic compounds
A
Transfer electrons
5
Q
How are ions formed
A
When atoms lose or gain ions
6
Q
How are atoms held together
A
By covalent bonds and polyatomic ions
7
Q
What’s a pure substance that are made up of 2 or more atoms that are joined together due to a chemical change
A
Compound
8
Q
How do Covalent compounds form
A
When non metals bond together by sharing electrons (Water, hydrogen and oxygen)
9
Q
Exothermic
A
Releases heat sound and light
10
Q
Endothermic
A
Absorbs heat and energy
11
Q
Reactant
A
The substance(s) that go under a reaction
12
Q
Physical change
A
A change in the appearance
Example: Cutting paper in half
13
Q
Chemical change
A
New products are formed
Example: Burning paper
