Theory

CH9 - ENERGY CHANGES AND REVERSIBLE REACTIONS

The diagram shows some properties that substances may have.To which labelled part of the diagram does $^{235}U$ belong?

2009 Summer

Theory

CH9 - ENERGY CHANGES AND REVERSIBLE REACTIONS

Which diagram shows a process in which an endothermic change is taking place?

2009 Summer

Theory

CH9 - ENERGY CHANGES AND REVERSIBLE REACTIONS

The equation shows a reaction that is reversed by changing the conditions.forward reaction$\text{CuSO}_4 . 5\text{H}_2\text{O} \rightarrow \text{CuSO}...

2009 Summer

Theory

CH9 - ENERGY CHANGES AND REVERSIBLE REACTIONS

Which diagram shows a process in which an endothermic change is taking place?

2009 Summer

Theory

CH9 - ENERGY CHANGES AND REVERSIBLE REACTIONS

The diagram shows some properties that substances may have. To which labelled part of the diagram does $^{235}U$ belong?[Image_1: Venn diagram with la...

2009 Summer

Theory

CH9 - ENERGY CHANGES AND REVERSIBLE REACTIONS

The equation shows a reaction that is reversed by changing the conditions. forward reaction $\text{CuSO}_4.5\text{H}_2\text{O} \rightarrow \text{CuS...

2009 Summer

Theory

CH9 - ENERGY CHANGES AND REVERSIBLE REACTIONS

Ammonia is manufactured by the Haber process. $$\text{N}_2(g) + 3\text{H}_2(g) \rightleftharpoons 2\text{NH}_3(g)$$ the forward reaction is exothermi...

2009 Summer

Theory

CH9 - ENERGY CHANGES AND REVERSIBLE REACTIONS

Hydrogen reacts with the halogens to form hydrogen halides.(a) Bond energy is the amount of energy, in kJ, that must be supplied (endothermic) to brea...

2009 Summer

Theory

CH9 - ENERGY CHANGES AND REVERSIBLE REACTIONS

Substance X requires oxygen in order to produce energy.It does not form carbon dioxide as a result of this energy production.What is substance X?A. hy...

2009 Winter

Theory

CH9 - ENERGY CHANGES AND REVERSIBLE REACTIONS

When an acid is added to an alkali the temperature rises.Which words describe this reaction?A decomposition and endothermicB decomposition and exother...

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