In a reaction, the mass lost in 30 seconds was 2 g. What is the average rate of reaction, in g s ⁻¹ , over this time?

The volume of gas collected in 2 minutes was 5 cm³ What was the average rate of reaction in cm³ min⁻¹ over this time?

An atom has 26 protons, 26 electrons and 30 neutrons. The atom has:

Which of the following particles contains a different number of electrons from the others? You may wish to use the data booklet to help you.

What is the charge on the chromium ion in CrCl₃?

Which of the following elements does NOT exist as diatomic molecules?

Which of the following elements forms an ion with a single positive charge and an electron arrangement of 2,8? You may wish to use the data booklet to help you.

An alkaline solution contains

A student made some statements about the effect of adding water to an acidic solution. Identify the correct statement.

Which of the following compounds is a base?

In which of the following compounds do the ions have the same electron arrangement? You may wish to use the data booklet to help you.

Tennessine is a newly discovered element with a predicted electron arrangement of 2,8,18,32,32,18,7. In which Group is this element found?

Which term can be used to describe the shape of a phosphorus trifluoride (PF₃) molecule?

Limewater can be made by dissolving calcium hydroxide in water. Which of the following terms correctly describes calcium hydroxide?

AgNO₃(aq) + KCl(aq) ---) AgCl(s) + KNO₃(aq)

0·25 moles of a gas has a mass of 7 g. Identify the correct formula for the gas.

What is the charge on the zinc ion in the compound zinc phosphate Zn₃(PO₄)₂?

An acidic solution contains

Which of the following oxides, when shaken with water, would give an alkaline solution?

Which of the following compounds is NOT a salt?

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