AS CHEMISTRY P1 REVISION

Use of the Data Booklet is relevant to this question.

When 3.00g of an anhydrous nitrate of a Group II metal is decomposed, 1.53g of gas is produced. What is the nitrate compound?

• beryllium nitrate

• calcium nitrate

• magnesium nitrate

• strontium nitrate

Use of the Data Booklet is relevant to this question.

1.15 g of a metallic element reacts with 300 cm³ of oxygen at 298K and 1 atm pressure, to form an oxide which contains O^2– ions.

What could be the identity of the metal?

• calcium

• magnesium

• potassium

• sodium

Ammonium sulfate in the soil is slowly oxidised by air, producing sulfuric acid, nitric acid and water as the only products.

How many moles of oxygen gas are needed for the complete oxidation of one mole of ammonium sulfate?

• 1

• 2

• 3

• 4

Which oxide does not react with cold dilute sodium hydroxide to produce a salt?

• Al₂O₃

• P₄O₁₀

• SO₂

• SiO₂

Which energy change corresponds to the enthalpy change of atomisation of hydrogen at 298K?

• the bond energy of a H–H bond

• half the bond energy of a H–H bond

• minus half the bond energy of a H–H bond

• minus the bond energy of a H–H bond

Which statement explains the observation that magnesium hydroxide dissolves in aqueous ammonium chloride, but not in aqueous sodium chloride?

• The ionic radius of the NH₄⁺ ion is similar to that of Mg²⁺ but not that of Na⁺.

• NH₄Cl dissociates less fully than NaCl.

• The Na⁺ and Mg²⁺ ions have the same number of electrons.

• The NH₄⁺ ion can donate a proton.

Use of the Data Booklet is relevant to this question.

Which element is likely to have electronegativity similar to that of aluminium?

• barium

• beryllium

• magnesium

• strontium

0.200 mol of a hydrocarbon undergo complete combustion to give 35.2g of carbon dioxide and 14.4g of water as the only products.

What is the molecular formula of the hydrocarbon?

• C₂H₄

• C₂H₆

• C₄H₄

• C₄H₈

The oxide and chloride of an element X are separately mixed with water. The two resulting solutions have the same effect on litmus.

What is element X?

• sodium

• magnesium

• aluminium

• phosphorus

Which element is expected to show the greatest tendency to form some covalent compounds?

• aluminium

• calcium

• magnesium

• sodium