Theory

CH11 - ACIDS AND BASES

Aqueous sodium hydroxide is added to a solution of a salt. A blue precipitate is formed which does not dissolve in excess.Aluminium foil is added to t...

2009 Summer

Theory

CH11 - ACIDS AND BASES

The graph shows how the pH of soil in a field changed over time.At which point was the soil neutral?

2009 Summer

Theory

CH11 - ACIDS AND BASES

An element E is burned in air. A white solid oxide is formed.The oxide is tested with damp red litmus paper. The paper turns blue.What is element E?A ...

2009 Summer

Theory

CH11 - ACIDS AND BASES

Some reactions of a substance, R, are shown in the diagram. What type of substance is R? A. an acid B. a base C. an element D. a salt

2009 Summer

Theory

CH11 - ACIDS AND BASES

Substance K reacts with sodium carbonate to form a gas.The gas turns limewater cloudy.What is substance K and which process takes place in the reactio...

2009 Summer

Theory

CH11 - ACIDS AND BASES

Some reactions of a substance, R, are shown in the diagram. What type of substance is R? A an acid B a base C an element D a salt

2009 Summer

Theory

CH11 - ACIDS AND BASES

An element E is burned in air. A white solid oxide is formed. The oxide is tested with damp red litmus paper. The paper turns blue. What is element E?...

2009 Summer

Theory

CH11 - ACIDS AND BASES

The graph shows how the pH of soil in a field changed over time.At which point was the soil neutral?[Graph displaying pH changes over time with points...

2009 Summer

Theory

CH11 - ACIDS AND BASES

Aqueous sodium hydroxide is added to a solution of a salt. A blue precipitate is formed which does not dissolve in excess.Aluminium foil is added to t...

2009 Summer

Theory

CH11 - ACIDS AND BASES

Substance K reacts with sodium carbonate to form a gas.The gas turns limewater cloudy.What is substance K and which process takes place in the reactio...

2009 Summer

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