Theory

CH15 - AIR AND WATER

An iron nail is placed in a closed test-tube, containing gas L. The nail rusts.What is gas L...

2009 Summer

Theory

CH15 - AIR AND WATER

Which statements are correct?1. Carbon monoxide is responsible for the production of ‘acid rain’.2. Oxides of nitrogen are present in car exhausts...

2009 Summer

Theory

CH15 - AIR AND WATER

The diagram shows stages in the purification of water. Which stage uses chlorine?

2009 Summer

Theory

CH15 - AIR AND WATER

An inert atmosphere is needed in a lamp to lengthen the useful life of the metal filament. Why is argon, rather than helium, used for this purpose? ...

2009 Summer

Theory

CH15 - AIR AND WATER

The diagram shows stages in the purification of water.Which stage uses chlorine?

2009 Summer

Theory

CH15 - AIR AND WATER

Which statements are correct?1. Carbon monoxide is responsible for the production of 'acid rain'.2. Oxides of nitrogen are present in car exhausts.3. ...

2009 Summer

Theory

CH15 - AIR AND WATER

An iron nail is placed in a closed test-tube, containing gas L. The nail rusts.What is gas L?A carbon dioxideB hydrogenC nitrogenD oxygen

2009 Summer

Theory

CH15 - AIR AND WATER

A newspaper article claims that carbon dioxide is formed as follows.1. during respiration2. when calcium carbonate reacts with hydrochloric acid3. whe...

2009 Winter

Theory

CH15 - AIR AND WATER

Which iron nail rusts? [Image_1: Four nails in test tubes labeled A (zinc coated nail), B (painted nail), C (nail in damp cloth), D (nail covered in ...

2009 Winter

Theory

CH15 - AIR AND WATER

A new planet has been discovered and its atmosphere has been analysed.[Image_1: A diagram showing a planet and its atmosphere is labeled]The table sho...

2009 Winter

Theory

CH1 - STATES OF MATTER

Which diagram shows the process of diffusion?[Image_1: A, B, C, D diagrams with different atoms]

2012 Summer

Theory

CH2 - SEPARATING SUBSTANCES

Which method is most suitable to obtain zinc carbonate from a suspension of zinc carbonate in water?A) crystallisationB) distillationC) evaporationD) ...

2012 Summer

Theory

CH10 - THE SPEED OF A REACTION

A student investigates how the concentration of an acid affects the speed of reaction with a 0.5 g mass of magnesium at 30°C.The student has a beaker...

2012 Summer

Theory

CH3 - ATOMS AND ELEMENTS

An element Y has the proton number 18.The next element in the Periodic Table is an element Z.Which statement is correct?A. Element Z has one more elec...

2012 Summer

Theory

CH3 - ATOMS AND ELEMENTS

Which atom has twice as many neutrons as protons?A: $^1_1\text{H}$B: $^2_1\text{H}$C: $^3_1\text{H}$D: $^4_2\text{He}$

2012 Summer

Theory

CH4 - ATOMS COMBINING

Which is a simple covalent molecule?[Table_1]

2012 Summer

Theory

CH4 - ATOMS COMBINING

The electronic structures of atoms P and Q are shown.P and Q react to form an ionic compound.What is the formula of this compound?A. PQ2B. P2QC. P2Q6D...

2012 Summer

Theory

CH4 - ATOMS COMBINING

The diagrams show the structures of two forms, P and Q, of a solid element.What are suitable uses of P and Q, based on their structures?[Table_1]| |...

2012 Summer

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

The equation for the reaction between magnesium and dilute sulfuric acid is shown.$$\text{Mg } + \text{ H}_2\text{SO}_4 \rightarrow \text{MgSO}_4 + \t...

2012 Summer

Theory

CH1 - STATES OF MATTER

Winston Churchill, a British Prime Minister, had his false teeth electroplated with gold. The teeth were coated with a thin layer of carbon and were t...

2012 Summer