Topic 3 - Chemical Changes

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

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Front (Question)

Acids in solution are a source of

Back (Answer)

Hydrogen ions(H+ ions). The higher the concentration of H+ ions, the lower the pH.

Front (Question)

Alkalis in solution are a source of

Back (Answer)

Hydroxide ions(OH- ions). The higher the conc of OH- ions, the higher the pH.

Front (Question)

Neutral, acidic and alkali solution pH

Back (Answer)

Neutral - 7 Acidic - <7 Alkali - >7

Front (Question)

A base is

Back (Answer)

A substance that reacts with an acid to make a salt and water

Front (Question)

Alkalis are

Back (Answer)

Bases that are soluble in water

Front (Question)

Acids and alkali effect on litmus paper

Back (Answer)

In an acid, blue litmus turns red In an alkali, red litmus turns blue

Front (Question)

Acids and alkali effect on methyl orange

Back (Answer)

Turns red in an acid and yellow in an alkali

Front (Question)

Acid and alkali effect on phenolphthalein

Back (Answer)

Colourless in acid, pink in alkalis

Front (Question)

The higher the concnetration of H+ ions in an acid,

Back (Answer)

The stronger the acid and lower the pH

#10

Front (Question)

The higher the concentration of OH- ions in an alkali,

Back (Answer)

The stronger the alkali and higher the pH

#11

Front (Question)

An increase by a factor of 10 to H+ concentration leads to

Back (Answer)

A decrease in pH by 1

#12

Front (Question)

The steps of the neutralisation practical between calcium oxide and dilute hydrochloric acid

Back (Answer)

Measure out a certain amount of hydrochloric acid using a pipette. Measure a fixed mass of calcium oxide Mix them Wait for the calcium oxide to all react, then measure the pH and add more. Repeat until there is an excess

#13

Front (Question)

Dilute means

Back (Answer)

There is a low concentration of a substance in the solution

#14

Front (Question)

Concentrated means

Back (Answer)

There is a high concentration of a substance in a solution

#15

Front (Question)

What makes an acid strong

Back (Answer)

They ionise almost completely in water. A large proprotion of the acid molecules dissociate to release H+ ions. Low pH

#16

Front (Question)

What makes an acid weak

Back (Answer)

The dont fully ionise in solution. A small amount of molecules dissociate into H+ ions. Higher pH.

#17

Front (Question)

The difference between strong and concentrated acids

Back (Answer)

Concentration shows how much acid is in the water but strength shows how many acid molecules ionise in water.

#18

Front (Question)

A reaction between an acid and a base is called

Back (Answer)

A neutralisation reaction

#19

Front (Question)

A salt is

Back (Answer)

An ionic compond

#20

Front (Question)

Acid+Metal oxide ->

Back (Answer)

Salt+Water

#21

Front (Question)

Acid + Metal Hydroxide ->

Back (Answer)

Salt+Water

#22

Front (Question)

Acid + Metal ->

Back (Answer)

Salt+Hydrogen

#23

Front (Question)

Acid+ metal carbonate ->

Back (Answer)

Salt + Water+ Carbon dioxide

#24

Front (Question)

Steps of hydrogen test

Back (Answer)

Put a lighted splint into the test tube. If hydrogen is present there will be a squeaky pop