Theory

CH10 - THE SPEED OF A REACTION

Which does not increase the speed of a reaction? A adding a catalyst B increasing the concentration of one of the reactants C increasing the particle ...

2009 Summer

Theory

CH10 - THE SPEED OF A REACTION

Which does not increase the speed of a reaction?A. adding a catalystB. increasing the concentration of one of the reactantsC. increasing the particle ...

2009 Summer

Theory

CH10 - THE SPEED OF A REACTION

Which change does not increase the speed of reaction between zinc and hydrochloric acid?A. adding a catalystB. decreasing the temperatureC. decreasing...

2009 Winter

Theory

CH10 - THE SPEED OF A REACTION

Which change does not increase the speed of reaction between zinc and hydrochloric acid?A. adding a catalystB. decreasing the temperatureC. decreasing...

2009 Winter

Theory

CH10 - THE SPEED OF A REACTION

A student investigates the rate of reaction between marble chips and hydrochloric acid.The loss in mass of the reaction flask is measured.The graph sh...

2010 Summer

Theory

CH10 - THE SPEED OF A REACTION

A student investigates the rate of reaction between marble chips and hydrochloric acid. The loss in mass of the reaction flask is measured. The graph ...

2010 Summer

Theory

CH10 - THE SPEED OF A REACTION

A student investigates the rate of reaction between marble chips and hydrochloric acid.The loss in mass of the reaction flask is measured.The graph sh...

2010 Summer

Theory

CH10 - THE SPEED OF A REACTION

A diagram of the apparatus which could be used to investigate the rate of reaction between magnesium and an excess of an acid is drawn below.(a) The m...

2010 Summer

Theory

CH10 - THE SPEED OF A REACTION

The hydrolysis of complex carbohydrates to simple sugars is catalysed by enzymes called carbohydrases and also by dilute acids.(a) (i) They are both c...

2010 Summer

Theory

CH10 - THE SPEED OF A REACTION

Thallium is a metal in Group III. It has oxidation states of +1 and +3.(a) Give the formula for the following thallium compounds. (i) thallium(I) sulf...

2010 Summer

Theory

CH1 - STATES OF MATTER

The diagram shows the result of dropping a purple crystal into water.Which processes take place in this experiment?[Table_1]| | chemical reac...

2014 Summer

Theory

CH2 - SEPARATING SUBSTANCES

The four pieces of apparatus shown below are used in chemical experiments.Which statement about the apparatus is correct?A. The burette measures the v...

2014 Summer

Theory

CH2 - SEPARATING SUBSTANCES

Alcohol and water are completely miscible. This means when mixed together they form only one liquid layer.Which method is used to separate alcohol fro...

2014 Summer

Theory

CH3 - ATOMS AND ELEMENTS

The diagram shows the structure of an atom of element X. What is X?A. boronB. carbonC. sodiumD. sulfur

2014 Summer

Theory

CH3 - ATOMS AND ELEMENTS

The diagrams show four particles. Which two diagrams show atoms that are isotopes of each other?A 1 and 2B 1 and 3C 2 and 3D 2 and 4

2014 Summer

Theory

CH4 - ATOMS COMBINING

The 'lead' in a pencil is made of a mixture of graphite and clay. When the percentage of graphite is increased, the pencil slides across the paper mor...

2014 Summer

Theory

CH4 - ATOMS COMBINING

Element X is in Group I of the Periodic Table. X reacts with element Y to form an ionic compound.Which equation shows the process that takes place whe...

2014 Summer

Theory

CH4 - ATOMS COMBINING

Solid F is an element.Solid G is a compound.Neither solid conducts electricity but G conducts electricity when dissolved in water.These properties sug...

2014 Summer

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

A compound contains one atom of calcium, two atoms of hydrogen and two atoms of oxygen.What is the correct chemical formula of the compound?A CaO_2H_2...

2014 Summer

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

In athletics, banned drugs such as nandrolone have been taken illegally to improve performance. Nandrolone has the molecular formula $C_{18}H_{26}O_{2...

2014 Summer