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

CH1 - STATES OF MATTER

Molten lead(II) bromide is electrolysed as shown. Which ions are discharged at each electrode?[Table_1]Positive electrode | Negative electrodeA: Pb+ |...

2009 Summer

Theory

CH1 - STATES OF MATTER

Which of these elements could be formed at the anode when a molten salt is electrolysed?A. copperB. iodineC. lithiumD. strontium

2009 Summer

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. T...

2009 Summer

Theory

CH1 - STATES OF MATTER

Which of these elements could be formed at the anode when a molten salt is electrolysed?A copperB iodineC lithiumD strontium

2009 Summer

Theory

CH1 - STATES OF MATTER

Molten lead(II) bromide is electrolysed as shown. [Image_1: Diagram of an electrolytic cell with molten lead(II) bromide] Which ions are discharged a...

2009 Summer

Theory

CH1 - STATES OF MATTER

The results of experiments on electrolysis using inert electrodes are given in the table.Complete the table; the first line has been completed as an e...

2009 Summer

Theory

CH1 - STATES OF MATTER

Some grass is crushed and mixed with the solvent, propanone. The colour pigments are extracted to give a deep green solution.(a) (i) Draw a labelled d...

2009 Summer

Theory

CH1 - STATES OF MATTER

The results of experiments on electrolysis using inert electrodes are given in the table. Complete the table; the first line has been completed as an ...

2009 Summer

Theory

CH1 - STATES OF MATTER

The following is a list of the electron distributions of atoms of unknown elements.[Table_1: element - electron distribution](a) Choose an element fro...

2009 Summer

Theory

CH1 - STATES OF MATTER

The diagram shows a cup of tea. Which row describes the water particles in the air above the cup compared with the water particles in the cup?[Table_1...

2010 Summer

Theory

CH2 - SEPARATING SUBSTANCES

A fruit drink coloured orange contains a dissolved mixture of red and yellow colouring agents. One of these colouring agents is suspected of being ill...

2010 Summer

Theory

CH1 - STATES OF MATTER

A student carries out an experiment to find how fast 3 cm pieces of magnesium ribbon dissolve in 10 cm³ samples of sulfuric acid at different tempera...

2010 Summer

Theory

CH4 - ATOMS COMBINING

Which row shows the change that takes place when element X gains the new particle shown?[Table_1]Table 1| | particle gained | change || --- ...

2010 Summer

Theory

CH3 - ATOMS AND ELEMENTS

The diagram shows an atom.key𝑒 electronnucleus containing nine particlesWhat is the proton number and neutron number of the atom?[Table_1]| | ...

2010 Summer

Theory

CH3 - ATOMS AND ELEMENTS

The symbols of two atoms may be written as shown.$$^{52}_{23}\text{X} \quad {}^{52}_{24}\text{Y}$$Which statement about these atoms is correct?A. They...

2010 Summer

Theory

CH14 - MAKING USE OF METALS

Which name is given to mixtures of metals?A. alloysB. compoundsC. oresD. salts

2010 Summer

Theory

CH4 - ATOMS COMBINING

Element X has six electrons in its outer shell.How could the element react?A by gaining two electrons to form a positive ionB by losing six electrons ...

2010 Summer

Theory

CH4 - ATOMS COMBINING

In which compounds are pairs of electrons shared between atoms?1. sodium chloride2. methane3. lead bromideA 1 only B 2 only C 1 and 3 D 1, 2 and 3

2010 Summer

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

Hydrogen and chlorine react as shown.What is the equation for this reaction?A. $2H + 2Cl \rightarrow 2HCl$B. $2H + 2Cl \rightarrow H_2Cl_2$C. $H_2 + C...

2010 Summer