Chemical Change

Question 1

What type of change is burning wood?

Answer 1

Burning wood is an example of a chemical change. The wood cannot go back to its original form.

Question 2

What type of change is melting chocolate?

Answer 2

Physical Change

Question 3

What is the difference between chemical change and physical change

Answer 3

Chemical change can not be reversed while physical change can.

Question 4

When liam becomes goth, is it physical or chemical change

Answer 4

Physical because liam can go back to being normal

Question 5

How do you known that a chemical change is occurring??

Answer 5

A change in colour, bubbles or fizzing which means a gas is being created or change in temperature.

Question 6

In a chemical reaction do the atoms -rearrange

                                                            - disappear
                                                            - multiply

Answer 6

Rearrange

Question 7

What is a endothermic reaction??

Answer 7

A process or reaction in which systems absorb energy from surroundings. eg) heat light

Question 8

What is a exothermic reaction??

Answer 8

A chemical reaction that releases energy. eg) light and heat

The opposite to endothermic

Question 9

What type of change is snapping a stick?

Answer 9

It is a chemical change because the stick cannot go back to one piece.

Question 10

What type of change is melting ice?

Answer 10

It is a physical change because it can go back to being ice.

Question 11

What type of change is cutting your hair?

Answer 11

It is a physical change because it can grow back.

Question 12

What type of change is burning paper?

Answer 12

It is a chemical change because it can not go back to being paper.

Question 13

What is Li?

Answer 13

Li is a element.

Question 14

What is the state of mercury?

Answer 14

Liquid.

Question 15

What is the state of hydrogen?

Answer 15

Gas.

Question 16

What is the state of gold?

Answer 16

Solid.

Question 17

What state is curium?

Answer 17

Synthetically prepared

Question 18

What is a compound?

Answer 18

A compound is where two elements are joined roger e.g Au and Ag.

Question 19

What change is freezing water?

Answer 19

It is a physical change because it can always go back to being just water.

Question 20

What is a mixture?

Answer 20

A mixture can be lots of different items thrown together.

Question 21

What is an energy change?

Answer 21

An energy change occurs when physical changes occurs e.g ice absorbs energy from the environment to become liquid water.

Question 22

does the mass change if the ice cube melts

Answer 22

Yes because it still has the same amount of atoms.

Question 23

What is a precipitate?

Answer 23

Precipitate is a solid that forms inside a solution.

Question 24

Is rust a chemical or physical change?

Answer 24

Rust is a chemical change because it cannot go back.