Acids and Alkalis Keywords

Question 1

Acid

Answer 1

A pH lower than 7

Question 2

Corrosive

Answer 2

A substance which reacts with materials to make them dissolve

Question 3

Irritant

Answer 3

Something that reddens/irritates the skin

Question 4

Hydrogen

Answer 4

The atom present in all acids

Question 5

Hydroxide

Answer 5

The atom present in all alkalis

Question 6

Alkali

Answer 6

A soluble base that has a pH higher than 7. Effect: soapy, soluble

Question 7

Indicator

Answer 7

A dye that can change colour when place in environments with different pH values

Question 8

Litmus

Answer 8

An indicator which tells us something is an acid or alkali

Question 9

Neutral

Answer 9

When a substance is neither acidic or alkaline - pH 7.

Question 10

Strong acid (particles)

Answer 10

Lots of hydrogen ions

Question 11

Alkali (particles)

Answer 11

Lots of hydroxide ions

Question 12

Weak acid

Answer 12

Few hydrogen particles

Question 13

Universal indicator

Answer 13

A mixture of dyes which creates a range of colour depending on the strength of acidity or alkalinity being tested.

Question 14

pH number

Answer 14

The scale from 1-14 which shows acidity or alkalinity.

Question 15

Neutralisation

Answer 15

When an acid and alkali/base react to form salt and water and resulting a pH of 7.

Question 16

Titration

Answer 16

A laboratory method allowing accurate volumes of liquids to be measured.

Question 17

Water

Answer 17

A molecule of water containing 2 hydrogen atoms and 1 oxygen atom.

Question 18

Salt

Answer 18

A substance formed when an acid reacts with a base.

Question 19

Equation

Answer 19

A way of summarising a chemical reaction with the reactants on the left of the arrow and the products on the right.

Question 20

Base

Answer 20

Something that neutralises an acid. Most of them are insoluble.

Question 21

Chemical reaction

Answer 21

a process in which one or more substances are changed into others by their atoms being rearranged

Question 22

Salt

Answer 22

The substance formed when and acid reacts with base

Question 23

Reactivity

Answer 23

How reactive a substance is

Question 24

Carbonate

Answer 24

A type of compound containing carbon and oxygen

Question 25

Carbon dioxide

Answer 25

the gas in the air used by plants to make food. It is produced during respiration, by burning fossil fuels or by acids reacting with metal carbonates

Question 26

Limewater

Answer 26

A solution used to test for the presence of carbon dioxide

Question 27

Indigestion

Answer 27

Disruption of the digestion process often resulting in too much acid being produced

Question 28

Heartburn

Answer 28

When acid from the stomach irritates the upper digestive tract

Question 29

Antacid

Answer 29

A substance that neutralises stomach acid

Question 30

Fertiliser

Answer 30

A chemical put on soil to increase soil fertility and allow better growth of crop plants

Question 31

Misconception

Answer 31

A common idea that people share that is inaccurate

Question 32

Fuel

Answer 32

A material that is burnt to release its energy

Question 33

Combustion

Answer 33

The process of burning

Question 34

Fire triangle

Answer 34

A model to show the 3 things needed for a fire - oxygen, fuel, heat

Question 35

Exothermic

Answer 35

A chemical reaction where heat is given out. Exo - exit

Question 36

Endothermic

Answer 36

A chemical reaction where heat energy is taken in. Endo - enter

Question 37

Energy

Answer 37

Something has energy if it has the ability to make something happen when the energy is transferred

Question 38

Sulfur Oxide

Answer 38

It’s produced when sulphur is oxidised during the combustion of some fossil fuels and is one of the main gases that produces acid rain

Question 39

Acid rain

Answer 39

Rainwater that is made acidic by pollutant gases e.g sulphur dioxide and nitrogen oxide

Question 40

Catalyst

Answer 40

Speeds up a chemical reaction without being used up