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 changes that occur when a substance changes state are shown below.Which process, W, X, Y or Z, is occurring in the following four situations?1. Bu...

2015 Summer

Theory

CH1 - STATES OF MATTER

A student uses the apparatus shown in the diagram below to measure the volume of carbon dioxide gas made when different masses of marble chips are add...

2015 Summer

Theory

CH3 - ATOMS AND ELEMENTS

Atoms contain electrons, neutrons and protons. What is the definition of nucleon number? A the number of neutrons in the nucleus of an atom B the numb...

2015 Summer

Theory

CH3 - ATOMS AND ELEMENTS

The diagram shows the atomic structure of an element X. What is X?A. aluminiumB. berylliumC. boronD. fluorine

2015 Summer

Theory

CH3 - ATOMS AND ELEMENTS

Which statements comparing the properties of electrons, neutrons and protons are correct?[Table_1]Table:| | neutrons and protons are both heavier th...

2015 Summer

Theory

CH4 - ATOMS COMBINING

Rescuers are drilling through fallen rock in order to rescue some men trapped in a cave. The drill needs lubricating from time to time.The following s...

2015 Summer

Theory

CH4 - ATOMS COMBINING

In which compounds are pairs of electrons shared between atoms?1. methane2. lead bromide3. sodium chlorideA. 1 onlyB. 2 onlyC. 1 and 3D. 1, 2 and 3

2015 Summer

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

What is the relative formula mass, $M_r$, of $CaCO_3$?A. 50B. 68C. 100D. 204

2015 Summer

Theory

CH1 - STATES OF MATTER

Copper and hydrogen can each be formed by electrolysis. At which electrodes are these elements formed? [Table_1]

2015 Summer

Theory

CH1 - STATES OF MATTER

The diagram shows a failed attempt to copper-plate a pan.Which action will plate the pan with copper?A. cooling the copper sulfate solution in an ice ...

2015 Summer