Chemistry Gr8 Unit Test

Question 2

Qualitative vs Quantitative

Answer 2

Qualitative: described and compared using words
Quantitative: can be measured numerically

Question 3

Density calculations

Answer 3

Density = m/v
Mass= dxv
Volume= m/d

Question 4

Chemical versus physical properties

Answer 4

Physical property a characteristic is such as colour density or melting point that you can observe or measure without changing what it’s made of
Chemical property: a trait that describes how a substance reacts or transforms into something

Question 5

Mass, Volume Density Units

Answer 5

Mass= g/kg
Volume= ml/cm3
Density= g/ml OR g/cm3

Question 6

Compare densities; sink or float

Answer 6

Higher density= sink
Lower density= float

Question 7

What can affect density

Answer 7

Mass
Volume
Temperature

Question 8

Finding volume by difference

Answer 8

Step1. Fill a graduated cylinder with water and record volume
Step2: Submerge the object in the water
Step3. Record new volume
Step4: Subtract the initial volume from new volume; object = v2- v1

Question 9

Finding volume of a cube/rectangle

Answer 9

Volume= Length x Width x Height

Question 10

Physical vs Chemical changes

Answer 10

Physical changes: an alteration of a substances form or state, whether that’s cutting melting or freezing

Chemical: a process in which a substance turns into another substance for example, rusting or burning

Question 11

Law of Conservation

Answer 11

• matter cannot be created nor destroyed

ex. if you burn a piece of wood in a closed container, the mass of wood + oxygen before burning is = to the mass of the ash, gases and remaining materials after burning

Question 12

Using Periodic Table to find…

Answer 12

Number of protons= atomic number

Number of neutrons= mass number - atomic number

Number of electrons (ion) = atomic number - change - (atom) = atomic#

Ion change= number of protons - electrons

Question 13

Subatomic Particles

Answer 13

Charges:
Protons= positive
Neutrons= no charge/neutral
Electrons= negative

Question 14

States of Matter

Answer 14

SOILD, LIQUID, GAS

Question 15

Liquid to Solid

Answer 15

Freezing

Question 16

Solid to liquid

Answer 16

Melting

Question 17

Solid to Gas

Answer 17

Sublimation

Question 18

Gas to solid

Answer 18

Deposition

Question 19

Liquid to gas

Answer 19

Evaporation

Question 20

Gas to liquid

Answer 20

Condensation

Question 21

Kinetic Molecular Theory

Answer 21

1. All matter is made of tiny particles.
2. These particles are always in motion. (Solids: particles vibrate in place. Liquids: particles slide past each other. Gases: particles move around quickly and freely.
3. Adding heat/energy makes prodigal more faster.