Identifying the Products of Chemical Reactions (OCR GCSE Chemistry A (Gateway))

A student investigates a white solid.

Table 17.1 shows some of the results of the tests that the student does.

Table 17.1

Which ion is shown to be in the white solid by the result of Test 1?

i) Which ion is shown to be in the white solid by the result of Test 2?

[1]

ii) The gas given off in Test 2 is carbon dioxide, CO₂.

What is the expected result with limewater?

[1]

The student reacts some metals with different salt solutions.

Table 17.2 shows her results.

Table 17.2

i) What colour is iron sulfate solution?

[1]

ii) Write down the order of reactivity of the four metals copper, iron, magnesium and zinc.

Use Table 17.2 to help you.

........................................... most reactive ..........................................
..........................................
........................................ least reactive 

[2]

iii) Magnesium reacts with copper sulfate, CuSO₄.

Magnesium sulfate, MgSO₄, and copper are made.

Write the balanced symbol equation for this reaction.

[1]

A student wants to identify the ions contained in a solid, X.

She dissolves the solid in some water and then does some tests on the solution.

Look at the table of her results.

Describe how the student does the flame test in Test 1.

You may draw a labelled diagram to help your answer.

The student thinks that solid X contains only lithium ions, Li⁺, and sulfate ions, SO₄^2-.

Use her results to explain if she is correct.