grade 10 A

During a reaction, the following changes take place.

1 The temperature rises.

2 A gas is given off.

Which apparatus is required to measure the rate of this reaction?

• balance and burette

• balance and gas syringe

• gas syringe and burette

• gas syringe and stopclock

Which statement about bonding is not correct?

• Carbon can form four single covalent bonds.

• Chlorine atoms react to gain a noble gas electronic structure.

• Covalent bonding involves losing and gaining electrons.

• Hydrogen molecules have the formula H2.

The diagram shows apparatus for plating a spoon with silver.

Which statement is not correct?

• Silver would stick to the spoon because it is a very reactive metal.

• The electrolyte would be a silver salt dissolved in water.

• The metal electrode would be made from silver.

• The spoon would be connected to the negative terminal of the power supply.

When copper is heated in air a black coating forms on the copper.

What happens to the copper in this reaction?

• The copper catches fire

• The copper decomposes.

• The copper gains oxygen

• The copper loses oxygen

Which two processes are involved in the preparation of magnesium sulfate from dilute sulfuric

acid and an excess of magnesium oxide?

• neutralisation and filtration

• neutralisation and oxidation

• thermal decomposition and filtration

• thermal decomposition and oxidation

Which statement about aqueous sodium hydroxide is correct?

• When it is added to a solution containing sulfate ions, a white precipitate is formed.

• When it is added to a solution of copper(II) ions, a blue precipitate is formed which dissolves

  in excess to give deep blue solution.

• When it is added to a solution of iron(II) ions, a green precipitate is formed which does not

  dissolve in excess.

• When it is added to ammonium chloride, a gas is produced which turns blue litmus red.

Which pair of elements will react together most violently?

• chlorine and lithium

• chlorine and potassium

• iodine and lithium

• iodine and potassium

Which is not a characteristic property of transition metals?

• act as catalysts

• form coloured compounds

• high melting point

• low density

Metal X lies between zinc and iron in the reactivity series.

Which statements about metal X are correct?

1 It reacts with steam to produce hydrogen gas.

2 It does not react with steam but will produce hydrogen with dilute acid.

3 The metal can be obtained from its oxide by heating strongly with charcoal.

4 The metal oxide cannot be reduced using carbon.

• 1 and 3

• 1 and 4

• 2 and 3

• 2 and 4

The table describes three types of water.

Which statement is correct?

• Only Q and R are suitable for drinking, while P could be used for irrigation.

• Only Q and R are suitable for drinking, while P is unsuitable for any purpose.

• Only Q is suitable for drinking. R could be used for washing cars and P for irrigation.

• P, Q and R are suitable for irrigation and washing cars, but are not suitable for drinking.