Chemistry 0620 · IGCSE · The characteristic properties of acids and bases

The characteristic properties of acids and bases — practice question

A diagram of tartaric acid is shown.
(a(i))[1]

On the structure, circle one alcohol functional group.

(a(ii))[1]

Work out the formula of tartaric acid to show how many carbon, hydrogen and oxygen atoms it contains.

(a(iii))[2]

Use your Periodic Table to help you complete the table and calculate the relative molecular mass of tartaric acid.

(b(i))[2]

Complete the word equation for the reaction between nitric acid and calcium hydroxide.

(b(ii))[1]

An aqueous solution of calcium hydroxide is alkaline. Identify which of these pH values shows an alkaline solution.

(b(iii))[2]

pH can be measured with a pH meter. Describe one alternative method for finding pH.

(b(iv))[1]

Farmers apply calcium hydroxide (slaked lime) to fields where crops are grown. Explain why.

(c(i))[2]

State the meaning of the term thermal decomposition.

(c(ii))[1]

Complete the energy level diagram for the thermal decomposition of calcium carbonate by adding these words to the diagram: reactant, products.

(c(iii))[1]

Explain, using the energy level diagram, how you know that this reaction is endothermic.

Worked solution & mark scheme

This 14-mark question has a full step-by-step worked solution and mark scheme. One marking point: Encircle one or both alcoholic O-H groups

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