Structure and Properties of Acids and Bases

The diagram shows the pH values of four solutions.

Which of these solutions are alkaline?

• P only

• P and Q only

• Q, R and S only

• R and S only

The graph shows how the pH of soil in a field changes over time.

At which point was the soil neutral?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-2

Some reactions of a substance, R, are shown in the diagram.

What type of substance is R?

• an acid

• a base

• an element

• a salt

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

• A

• B

• C

• D

Which reaction will result in a decrease in pH?

• adding calcium hydroxide to acid soil

• adding citric acid to sodium hydrogen carbonate solution

• adding sodium chloride to silver nitrate solution

• adding sodium hydroxide to hydrochloric acid

• A

• B

• C

• D

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

An aqueous solution of the organic compound methylamine has a pH greater than 7.

Which statement about methylamine is correct?

• It neutralises an aqueous solution of sodium hydroxide.

• It reacts with copper(II) carbonate to give carbon dioxide.

• It reacts with hydrochloric acid to form a salt.

• It turns blue litmus red.

Which type of reaction always forms a salt and water?

• exothermic

• neutralisation

• oxidation

• polymerisation

An alloy contains copper and zinc.

Some of the zinc has become oxidised to zinc oxide.

What is the result of adding an excess of dilute sulfuric acid to the alloy?

• A blue solution and a white solid remains.

• A colourless solution and a pink / brown solid remains.

• The alloy dissolves completely to give a blue solution.

• The alloy dissolves completely to give a colourless solution.

Tags

NGSS.HS-PS1-2

Which is not a typical property of an acid?

• They react with alkalis producing water.

• They react with all metals producing hydrogen.

• They react with carbonates producing carbon dioxide.

• They turn litmus paper red.