Chemistry 2021

Question 1

Atom

Answer 1

An atom is the smallest particle which can exist on its own

Question 2

Element

Answer 2

An element consists of only one type of atom and cannot be broken down into anything simpler

Question 3

Compound

Answer 3

A compound consists of two or more elements,chemically bonded together

Question 4

Atomic Number

Answer 4

The number of protons in an atom

Question 5

Atomic Mass

Answer 5

The number of protons+neutrons in an atom

Question 6

Ions

Answer 6

Is a charged paticle

Question 7

Isotopes

Answer 7

Atoms of a particular element with the same number of protons,but different number of neutrons

Question 8

Molecule

Answer 8

Two or more atoms covalently bonded together

Question 9

Diatomic

Answer 9

When a molecule contains two atoms covalently bonded together

Question 10

Van der waals forces

Answer 10

Weak attraction forces between the molecules

Question 11

Allotrope

Answer 11

Is a different structural form,of the same element in the same state

Question 12

Alloy

Answer 12

Mixture of two or more elements,one of which is a metal,resulting in the product having metallic properties

Question 13

Neutrationsion

Answer 13

H+(aq)+OH-(aq)=H20

Question 14

Malleable

Answer 14

beaten into shape

Question 15

Ductile

Answer 15

Drawn into wire

Question 16

Sonority

Answer 16

Produces sound when struck

Question 17

Group one
(5 points)

Answer 17

Alkai Metals

• White solids dissolve into colourless solutions
• Highly flammable and corrisive
• Low density
• Soft,when cut reveal a shiny surface but quick tarnish as it reacts with air.
• More reactive it you descend as the electrons in the outer shell is FURTHER from the positive nucleus ans is shielded by more shells of electrons which make it easier to remove

Question 18

Group zero

Answer 18

• Noble gas
• Colourless and unreactive gases
• As you descend the boiling points increases.

Question 19

What colour is:
Copper(II) oxide
Copper(II) carbonate
Hydrated copper(II) sulfate
In solution copper(II) compounds

Answer 19

• Black
• Green
• Blue
• Blue

Question 20

Relative Atomic Mass(Ar)

Answer 20

The mass of an atom compared to that of carbon-12 isotope,which mass it exactly 12.

Question 21

Acids

Answer 21

• Corrosive

- Contain Hydrogen ions

Question 22

Alkali

Answer 22

• Caustic
• Contains Hydroxide ions
• Soluble

Question 23

Base

Answer 23

Reacts with an acid to form a salt and water

Question 24

Salt

Answer 24

The compund formed when some or all the hydrogen ions of an acid are replaced by metal ions

Question 25

Pure Substance

Answer 25

A single element or compund which is not mixed with any other substance

Question 26

Formulation

Answer 26

A mixture designed as a useful product in carefully measured quanities for the desired properties

Question 27

Filtration

Answer 27

Insoluble solid from a solvent

Question 28

Crystallisation

Answer 28

Soluble solid that had dissolved on a solvent and made a solution

Question 29

Distillation

Answer 29

Mixture of miscible liquids | miscible(Liquids which are able to mix with each-other)

Question 30

Separating Funnel

Answer 30

Mixtures Immisible liquids | Immisible(Liquids not able to mix with each-other)

Question 31

Test for Water

Answer 31

Turns Anhydrous copper sulphate white to blue

Question 32

Test for chlorine

Answer 32

Litmus paper turns red then bleaches

Question 33

Test for Carbon Dioxide

Answer 33

Limewater colourless to milky

Question 34

Test for Hydrogen

Answer 34

Lighten splint,gives a squeaky pop

Question 35

Flame test - Calcium - Lithium - Copper - Potassium - Sodium

Answer 35

- Brick-red - Crimson - Blue/green - Lilac - Orange/yellow