Matter, Models and Density

Question 1

What is matter made of?

Answer 1

Atoms

Question 2

How are atoms sometimes pictures as?

Answer 2

A small ball

Question 3

What is it called when alpha particles fired at atoms bounce back?

Answer 3

Alpha scattering

Question 4

What is the difference between the mass of the nucleus and the electrons in an atom?

Answer 4

The nucleus contains almost all the mass

Question 5

What can electric charges cause in between atoms?

Answer 5

Forces

Question 6

Some atoms can form groups held together by electric force. What are these groups called?

Answer 6

Molecules

Question 7

What is the density of gases?

Answer 7

Low

Question 8

What is the density of liquids?

Answer 8

Medium

Question 9

What is the density of solids?

Answer 9

High

Question 10

What is density?

Answer 10

Mass per unit volume

Ratio of mass to volume

Question 11

How do you find the density of an irregularly shaped object?

Answer 11

You need to find the volume
- fill a eureka can with water
-weigh the object
- put the object in the eureka can
-measure volume of water displaced
Fill in formula

Question 12

Gas to solid

Answer 12

Deposition

Question 13

Solid to gas

Answer 13

Sublimation

Question 14

Gas to liquid

Answer 14

Condensation

Question 15

Liquid to gas

Answer 15

Evaporating

Question 16

Liquid to solid

Answer 16

Freezing

Question 17

Solid to liquid

Answer 17

Melting

Question 18

If 100g of water is frozen, how many grams of ice will there be and why?

Answer 18

100g

-conservation of mass

Question 19

What is a physical change?

Answer 19

A reversible change

Their original properties can be recovered

Question 20

What is a chemical change?

Answer 20

An irreversible change

Their properties are permanently changed

Question 21

Give an example of a chemical change

Answer 21

Lighting a match
Frying an egg
Baking a cake

Question 22

Give an example of a physical change

Answer 22

Freezing water
Melting chocolate
Mixing flour and sugar