Mocks

Question 1

Proton

Answer 1

Relative mass 1

Relative charge +1

Question 2

Neutron

Answer 2

Relative mass 1

Relative charge 0

Question 3

Electron

Answer 3

Relative mass 1
——
1836
Relative charge -1

Question 4

Nucleus

Answer 4

Contains protons and neutrons

Question 5

Isotopes

Answer 5

Same number of protons different number of neutrons

Question 6

Ions

Answer 6

Simple ions form when atoms lose or gain electrons

Question 7

Ionic bonding

Answer 7

Transfer of electrons

Question 8

Ionic compounds

Answer 8

High melting and boiling points due to strong attraction so takes lots of energy to break
Don’t conduct electricity

Question 9

Ionic compound models

Answer 9

2d representations - show the atoms and how they’re connected don’t show shape or size

Dot and cross diagrams- show how compounds/molecules are formed don’t show size or arrangement

3D models - show arrangement but only show outer layer

Question 10

Simple molecular substances

Answer 10

Simple molecular structures
Held together by very strong covalent bonds.
Forces of attraction are weak
Melting and boiling points low but increase as size increases
Don’t conduct electricity

Question 11

Giant covalent structures

Answer 11

Bonded by strong covalent bonds
High melting and boiling points
Don’t conduct electricity
Aren’t soluble
Diamond- carbon atoms each form 4 covalent bonds
Graphite- each carbon atom forms 3 covalent bonds

Question 12

Moles

Answer 12

Mass

Moles x relative formula mass

Question 13

Concentration

Answer 13

Mass

Concentration x volume

Question 14

Group 1, 7, 0

Answer 14

1- alkali metals
Very reactive-increase as u go down
Reaction with water- na+h20->naoh+h2
7- halogens
Reactivity decreases as go down
Test for chlorine using damp blue litmus paper 
0- noble gases

Question 15

Halogen displacement

Answer 15

A more reactive halogen will displace a less reactive one

Question 16

Rate of reaction

Answer 16

R of r = amount used
———————
Time

Question 17

Collision theory

Answer 17

Particles must collide with enough energy in order to collide
more collisions =higher the r of r
Increasing temp,concentration and surface area increases rate

Question 18

Catalyst

Answer 18

Speeds up r of r by decreasing activation energy

Question 19

Ending and exothermic reactions

Answer 19

Exo = hot(rise in temp)
Endo = cool(fall in temp)

Question 20

Greenhouse effect

Answer 20

Earth radiates some of the heat radiation it absorbs as longer wavelength, infared radiation.

Some ir is absorbed by ghg
Some ir reflected back to earth by ghg
Some ir re-emitted back to space
This keeps the earth warm