Chem for CXC section A

Question 1

what are the 3 states of matter

Answer 1

Solids
Liquids
Gas

Question 2

Arrangement of particles in solids

Answer 2

In a solid, the particles are pack together tightly in a neat and ordered arrangement.

Question 3

Arrangement of particles in liquids

Answer 3

The particles in liquids are arranged in a random way, and are close together, touching many of their neighbors.

Question 4

Arrangement of particles in gases

Answer 4

The particles in gases are widely spaced and randomly arranged.

Question 5

Diffusion

Answer 5

the movement of molecules from a region of higher concentration to a region of lower concentration until evenly distributed.

Question 6

Osmosis

Answer 6

the movement of water molecules from a solution with a high concentration of water molecules to a solution with a lower concentration of water molecules, through a cell’s partially permeable membrane.

Question 7

Relative mass and Charge of protons, neutron and electrons.

Answer 7

Relative mass Charge
Protons- 1 +1
Neutrons- 1 0
Electrons- 1/1840 -1

Question 8

Mass number=

Answer 8

Mass number= no.of protons + no.of neutrons

Question 9

Outer most shell is know as:

Answer 9

Valence Shell

Question 10

Isotopes

Answer 10

Atoms of an element that all have the same number of protons but different numbers of neutrons

Question 11

Periodic table is made up of:

Answer 11

7periods and 18groups

Question 12

What is an element

Answer 12

An element is a substance made up of only 1 type of atom

Question 13

What is a molecule

Answer 13

A particle containing 2 or more non- metal atoms covalently bonded together

Question 14

What is a compound

Answer 14

A pure substance formed when 2 / more different types of elements bond together in a chemical reaction.

Question 15

3 types of bonding

Answer 15

Ionic, Covalent and metallic

Question 16

What is covalent bonding

Answer 16

The sharing of electrons between metal and non metal

Question 17

What is ionic Bonding

Answer 17

bonding between metal and non metal. the transfer of election from metal to non metal

Question 18

What is metallic Bonding

Answer 18

Occurs in metals.

Question 19

What is a mixture

Answer 19

An impure substance formed by the physical combination of 2 / more substances

Question 20

Solution DEF

Answer 20

Mixture solute is completely dissolved

Question 21

Colloid Def

Answer 21

Mixture is partially dissolved

Question 22

suspension Def

Answer 22

Mixture does not dissolve.

Question 23

Separation techniques

Answer 23

Filtration
Evaporation
Crystallisation
Paper Chromatography
Separating Funnell

Question 24

Allotropes

Answer 24

An allotrope is one or more forms of a chemical element that can exist in the same physical state, possessing the same physical state but different physical properties.

Question 25

Types of allotropes

Answer 25

Diamond and graphite

Question 26

Diamond

Question 27

Graphite