Acids and Alkalis

Question 1

Acid

Answer 1

A substance that has a pH of lower than 7.

Question 2

Corrosive

Answer 2

A substance which reacts with materials and makes them dissolve.

Question 3

Irritant

Answer 3

Something that reddens the skin

Question 4

Hydrogen

Answer 4

The atom present in all acids

Question 5

Alkali

Answer 5

A soluble base that has a pH higher than 7.

Question 6

Soapy

Answer 6

The effect produced when an alkali is added to water

Question 7

Hydroxide

Answer 7

The particle present in alkalis

Question 8

Indicator

Answer 8

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

Question 9

Litmus

Answer 9

An indicator which tells us if something is an acid or an alkali

Question 10

Neutral

Answer 10

When a substance is neither acidic nor alkaline

Question 11

Strong acid / alkali

Answer 11

Contains a lot of hydrogen ions / particles (acid) or a lot of hydroxide ions / particles (alkali)

Question 12

Weak acid / alkali

Answer 12

Contains only a few hydrogen particles / ions (acid) or a lot of hydroxides particles / ions (alkali)

Question 13

Universal indicator

Answer 13

A mixture of dyes which create 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 or alkali combine resulting in products with pH 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 contains 2 hydrogen atoms and one 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 which neutralises an acid.