Science review

Definitions

100

The temperature at which liquid changes to gas

Physical or chemical?

Boiling point

physical

200

The measure of how acidic or basic/alkaline 

Physical or chemical?

pH level chemical

300

The ability to dissolve

Physical or Chemical?

solubility

physical

400

The ability to catch on fire

physical or chemical?

Flammability

chemical

500

The shininess of an object

physical or chemical?

Luster

physical

P and C

100

Burning Wood

Physical or chemical?

chemical

200

All mixtures

Physical or chemical?

Physical 

300

Chopping wood

Physical or chemical?

Physical

400

Grass growing

Physical or chemical?

Physical

500

Oxidation (rust)

Physical or chemical?

Chemical

Reactions

100

What number is neutral in pH level?

7

200

Acid what number to what number?

Base?

0-6: Acid

8-14: Base

7- Neutral 

300

What happens to the temperature during an Exothermic reaction?

Increases

400

Give an example of an Endothermic reaction

Ice pack

500

Explain the difference between an open and closed system

In an open system the energy or matter can escape and in a closed system energy cannot leave.

Chemical equation

100

 In a chemical equation, the reactants are on the _?_ and the products are on the _?_.

reactants-left

products-rigt

200

What does the Law of Conservation of Mass state?

         Mass cannot be created or destroyed in a chemical reaction; it can only change forms.

300

CH₄

C =  ?            H = ?

C=1

H=4

400

2(C2H6)

C =   ?           H = ?

C=4

H=12

500

 What is a chemical formula?

Chemical formula is a formula using chemical symbols and numbers that shows the types and amount of atoms that make up a compound.

Extra

100

What is the difference between a physical change and a chemical change?

A physical change changes the form or appearance of a substance without changing its chemical composition and no new substance is formed), whereas a chemical change results in a chemical reaction that creates one or more entirely new substances.

200

What are indicators of a chemical reaction [try to come up with 3 - 5]?

Color change, Odor change, Rusting, temperature change

300

 What is the only thing you can add to a chemical equation to make it balanced?

Coefficient

400

 C₂H₆  +    O₂   →     CO₂    +    H₂O

How many oxygen atoms are on the reactant side?

2

500

Combustion is a ____ process

a. Exothermic

b. Both

c. Endothermic

d. None

Exothermic