Year 8 Chemistry Revision

Question 1

You can speed up a chemical reaction by increasing the temperature.

Accepted Answer

True

Question 2

Magnesium and oxygen react to form magnesium oxide. What is/are the reactant(s)?

Accepted Answer

magnesium and oxygen

Question 3

If an atom with a positive charge (+1) has 12 protons, how many electrons does it have?

Accepted Answer

11

Question 4

Soluble substances are those that...

Accepted Answer

dissolve in water

Question 5

compounds are those that....

Accepted Answer

all of the above

Question 6

Water is composed of which two elements?

Accepted Answer

hydrogen and oxygen

Question 7

silicon is an example of a

Accepted Answer

metalloid

Question 8

Physical changes involve changes in the states of matter.

Accepted Answer

True

Question 9

Which subatomic particle in an atom carries NO CHARGE?

Accepted Answer

neutrons

Question 10

When placed in water, the LEAST REACTIVE element in group 1 of the periodic table is...

Accepted Answer

Lithium

Question 11

The chemical symbol for the element potassium is...

Accepted Answer

K

Question 12

If an atom with 12 protons has a negative charge (-1), how many electrons does it have?

Accepted Answer

13

Question 13

Burning is a chemical reaction.

Accepted Answer

True

Question 14

Magnesium and hydrochloric acid react to form magnesium chloride and hydrogen.

Accepted Answer

This is a single replacement reaction.

Question 15

Chemical changes can be easily reversed.

Accepted Answer

False

Question 16

Carbon dioxide is broken down into carbon and oxygen. What type of chemical reaction is this?

Accepted Answer

Decomposition reaction

Question 17

A mixture is comprised of....

Accepted Answer

2 or more elements and/or compounds NOT chemically bound

Question 18

When two liquids are mixed and a solid is formed, this type of reaction is known as a ....

Accepted Answer

precipitation reaction

Question 19

properties of metals include...

Accepted Answer

melt at high temperatures and are malleable

Question 20

If a neutral atom has 12 protons, how many electrons does it have?

Accepted Answer

12

Question 21

When magnesium and oxygen react they form magnesium oxide. Name this type of chemical reaction.

Accepted Answer

Combination reaction

Question 22

In a chemical reaction, the substances you end up with are called the

Accepted Answer

products

Question 23

What charge do protons have?

Accepted Answer

positive (+)

Question 24

If the compound carbon dioxide (CO2) is made of one carbon atom and two oxygen atoms, then 2CO2

Accepted Answer

is made of 2 carbon atoms and 4 oxygen atoms

Question 25

Carbon can be found in which type of substance?

Accepted Answer

Diamond

Question 26

What is the chemical formula for hydrochloric acid?

Accepted Answer

HCl

Question 27

Which one of the following is an example of a physical change?

Accepted Answer

ice melting to form liquid water

Question 28

when you move from left to right across the periodic table, the number of protons...

Accepted Answer

in each atom INCREASES

Year 8 Chemistry Revision

Questions 28

Year 8 Chemistry Revision

Questions 28