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

The diagram shows how the molecules in the exhaust gases diffuse into the air.Which statement describes what happens to these molecules next?A. The mo...

2009 Summer

Theory

CH2 - SEPARATING SUBSTANCES

A student takes 2 g samples of calcium carbonate and adds them to 20 cm$^3$ samples of dilute hydrochloric acid at different temperatures. She measure...

2009 Summer

Theory

CH2 - SEPARATING SUBSTANCES

The diagram shows the paper chromatograms of four substances, W, X, Y and Z. Which two substances are pure?A W and X B W and Y C X and Y D X and Z

2009 Summer

Theory

CH3 - ATOMS AND ELEMENTS

An element S has the proton number 18. The next element in the Periodic Table is an element T. Which statement is correct?A Element T has one more ele...

2009 Summer

Theory

CH3 - ATOMS AND ELEMENTS

Which numbers are added together to give the nucleon number of an ion?A number of electrons + number of neutronsB number of electrons + number of prot...

2009 Summer

Theory

CH3 - ATOMS AND ELEMENTS

The electronic configuration of an ion is 2.8.8.What could this ion be?[Table_1]

2009 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]

2009 Summer

Theory

CH4 - ATOMS COMBINING

Element V forms an acidic, covalent oxide. Which row in the table shows how many electrons there could be in the outer shell of an atom of V? [Table...

2009 Summer

Theory

CH4 - ATOMS COMBINING

When sodium chloride is formed from its elements, each chlorine atom ......1...... one ......2....... Which words correctly complete gaps 1 and 2? [...

2009 Summer

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

Nitrogen and hydrogen react together to form ammonia.$N_2 + 3H_2 \rightarrow 2NH_3$When completely converted, 7 tonnes of nitrogen gives 8.5 tonnes of...

2009 Summer