IGCSE Coordinated Chemistry Workout 7

The metal titanium occurs naturally combined with oxygen.

The table shows the combining powers of the elements in this compound.

What could be the formula of the compound?

• TiO₂

• Ti₂O

• TiO₄

• Ti₄O₂

Which trends in physical properties are correct for the alkali metals down Group 1?

• A

• B

• C

• D

Processes used in the petrochemical industry include

1 cracking.

2 distillation.

For which of these processes is a catalyst used?

• both 1 and 2

• 1 only

• 2 only

• neither 1 nor 2

The reactions of glucose are shown. Which two reactions involve polymerisation?

• P and Q

• P and R

• Q and R

• R and S

An alloy is used for making an aircraft body. Which properties does this alloy need to have?

• A

• B

• C

• D

How is carbon (coke) used in the extraction of iron from iron oxide?

• as an anode

• as a cathode

• as an oxidising agent

• as a reducing agent

Molten lead(II) bromide is electrolysed as shown. An element is deposited on the negative electrode. What is the name of the element and of the electrode?

• bromine at the anode

• bromine at the cathode

• lead at the anode

• lead at the cathode

Ammonia and sulphur dioxide are bubbled into separate samples of water. What are the pH values of the resulting solutions?

• A

• B

• C

• D

Fertilisers are used to supply the essential elements needed for plant growth. Which compound supplies two of these essential elements?

• Ca(H₂PO₄)₂

• Ca(NO₃)₂

• KNO₃

• (NH₄)₂SO₄

A student tests two solutions.

One solution is an aqueous copper salt. The other is an aqueous sodium salt.

How can the colours of the solutions and of flame tests show which solution is which?

• A

• B

• C

• D