Grade 10 E

The reaction between solution P and solution Q is exothermic.

A student is told to test this statement by mixing equal volumes of the two solutions and measuring the temperature change.

Which two pieces of apparatus should the student use?

• balance and clock

• balance and thermometer

• pipette and clock

• pipette and thermometer

A coin is dissolved in an acid. Chromatography is used to test the solution formed. The diagram

shows the chromatogram obtained

What is the coin made from?

• a metal element

• a non-metal element

• a mixture of metals

• a mixture of non-metals

What do the nuclei in hydrogen molecules contain?

• A electrons and neutrons

• electrons and protons

• neutrons only

• protons only

The diagram shows the structure of hydrogen peroxide.

What is the total number of electrons used for bonding in this molecule?

• 3

• 4

• 6

• 8

Why does the powdering of calcium carbonate increase the speed of its reaction with an acid?

• A It increases the mass of calcium carbonate.

• It increases the surface area of the calcium carbonate.

• The powder becomes more concentrated.

• The powder floats on top of the acid.

Which process does not involve either oxidation or reduction?

• A burning methane in the air

• extracting iron from hematite

• heating copper(II) oxide with carbon

• reacting sodium carbonate with dilute hydrochloric acid

An excess of acid in the stomach causes indigestion that can be cured by an anti-indigestion tablet.

What should the tablet contain to decrease the acidity?

• an acidic substance

• an alkaline substance

• a neutral substance

• Universal Indicator

Pure zinc sulphate can be prepared by adding an excess of either zinc carbonate or an excess of zinc hydroxide to dilute sulphuric acid.

In which form are these zinc compounds used?

• 
• 
• 
• 

Which aqueous ion causes a yellow precipitate to form when acidified aqueous lead(II) nitrate is

added to it?

• chloride

• iodide

• nitrate

• sulphate

Which information about an element can be used to predict its chemical properties?

• colour of its compounds

• density

• melting point

• position in the Periodic Table