C3 atoms, elements and compounds

Question 1

Element

Answer 1

A substance that contains only one type of atom and cannot be broken down into anything simpler by chemical means

Question 2

Compound

Answer 2

Two or more different elements chemically bonded together

Question 3

Chemical change

Answer 3

When two or more elements combine together to form a new substance

Question 4

How to know when a chemical change has taken place

Answer 4

• One or more new substances are formed
• Energy is taken in or given out
• The change is usually difficult to reverse

Question 5

Physical change

Answer 5

If no new chemical substances are formed and the change is squally easy to reverse

Question 6

Mixture

Answer 6

Contains more than one substance (just mix together and not chemically combined)

Question 7

Solution

Answer 7

Solute + solvent = solution

Question 8

Solvent

Answer 8

A substance which is used to dissolve the solute

Question 9

Solute

Answer 9

A substance that dissolves in the solvent

Question 10

Solubility

Answer 10

The ability to be dissolved

Question 11

Soluble

Answer 11

Capable of being dissolved

Question 12

Insoluble

Answer 12

Incapable of being dissolved

Question 13

Concentration

Answer 13

A concentrated solution is a solution that contains a large amount of solid relative to the amount that could dissolve

Question 14

Nucleon no. (mass no.)

Answer 14

The total number of protons and neutrons in the nucleus of an atom

Question 15

Isotopes

Answer 15

Atoms of the same element which have the same proton number but a different nuclear number

Question 16

Proton no. (atomic no.)

Answer 16

The number of protons in the nucleus of an atom

Question 17

Proton charge

Answer 17

+1

Question 18

Electron charge

Answer 18

-1

Question 19

Neutron charge

Answer 19

0

Question 20

Proton relative mass

Answer 20

1

Question 21

Neutron relative mass

Answer 21

1

Question 22

Electron mass

Answer 22

1/840 or negligible

Question 23

Ionic bonding

Answer 23

Bonding between a metal and a non-metal atom where metal atoms need to lose electrons and non-metal atoms need to gain electrons

Question 24

What happens during ionic bonding?

Answer 24

• The electrons are transferred from the metal to the non-metal atom
• Metal atoms lose electrons to form positive electrons while non-metal atoms gain electrons to form negative ions
• The two ions have opposite charges so they attract one another