Chem 4 (matter 2)

Question 1

Reactivity is the likelihood of

Answer 1

A substance to undergo a chemical reaction

Question 2

Flammability

Answer 2

Whether a substance will burn when exposed to a flame

Question 3

Combustibility is a measure of

Answer 3

How easily a substance will burn in oxygen

Question 4

If you can identify properties of a substance without changing it. That substance is a _ property

Answer 4

Physical

Question 5

The changes that matter experiences are classified as either _ or _

Answer 5

Physical

Chemical

Question 6

A physical change is any alteration to the _ of a substance (3)

Answer 6

Size

Shape

State

Question 7

State of a substance is (3)

Answer 7

Solid

Liquid

Gas

Question 8

In a physical change, the final changes take place without

Answer 8

Altering the substance’s composition

Question 9

Changes take place without altering molecular composition means

Answer 9

Final substance made of same matter as before the change

Question 10

Example of physical change keeping same molecular structure

Answer 10

Ice melts to water (solid/liquid)

Question 11

A chemical change occurs when matter changes into a _ and has a _

Answer 11

New substance

New chemical property

Question 12

Chemical changes do alter the

Answer 12

Molecular make up of a substance

Question 13

In a chemical change, final substance is not made of

Answer 13

The same matter as before the change

Question 14

Chemical change example _

Answer 14

Log burns into ash and gases

Question 15

You cannot change ash back into

Answer 15

A solid log

Question 16

You can tell if a chemical change has taken place if there is a change in _

Answer 16

Color

Question 17

Change of color example

Answer 17

Apple out of the refrigerator and turns brown

Question 18

You can tell if a chemical reaction has taken place if there is a change in (o)

Answer 18

Odor

Question 19

Change in odor definition

Answer 19

Food rotting

Question 20

Chemical change undergone when there is formation of a

Answer 20

Gas

Question 21

_ shows that gas has formed

Answer 21

Bubbles

Question 22

Example of two substances mixed to create gas

Answer 22

Vinegar and baking soda

Question 23

Precipitate is a _ formed during a chemical reaction

Answer 23

New solid

Question 24

A chemical change has happened when there is a formation of

Answer 24

A solid

Question 25

You can tell that a chemical change has taken place when there is a change in

Answer 25

Energy

Question 26

Change of energy is a chemical reaction that can be in the form of _ that releases energy

Answer 26

Heat and/or light

Question 27

Exothermic is

Answer 27

A physical or chemical reaction that releases heat and energy

Question 28

An example of an exothermic reaction

Answer 28

Making ice cubes

Question 29

Endothermic reaction definition

Answer 29

A physical or chemical reaction that absorbs heat and/or energy to complete its reaction

Question 30

Example of endothermic reaction (2)

Answer 30

Boiling water

melting ice cubes

Question 31

Boiling an egg is a _ change

Answer 31

Chemical change