Theory

CH15 - AIR AND WATER

An iron nail is placed in a closed test-tube, containing gas L. The nail rusts.What is gas L...

2009 Summer

Theory

CH15 - AIR AND WATER

Which statements are correct?1. Carbon monoxide is responsible for the production of ‘acid rain’.2. Oxides of nitrogen are present in car exhausts...

2009 Summer

Theory

CH15 - AIR AND WATER

The diagram shows stages in the purification of water. Which stage uses chlorine?

2009 Summer

Theory

CH15 - AIR AND WATER

An inert atmosphere is needed in a lamp to lengthen the useful life of the metal filament. Why is argon, rather than helium, used for this purpose? ...

2009 Summer

Theory

CH15 - AIR AND WATER

The diagram shows stages in the purification of water.Which stage uses chlorine?

2009 Summer

Theory

CH15 - AIR AND WATER

Which statements are correct?1. Carbon monoxide is responsible for the production of 'acid rain'.2. Oxides of nitrogen are present in car exhausts.3. ...

2009 Summer

Theory

CH15 - AIR AND WATER

An iron nail is placed in a closed test-tube, containing gas L. The nail rusts.What is gas L?A carbon dioxideB hydrogenC nitrogenD oxygen

2009 Summer

Theory

CH15 - AIR AND WATER

A newspaper article claims that carbon dioxide is formed as follows.1. during respiration2. when calcium carbonate reacts with hydrochloric acid3. whe...

2009 Winter

Theory

CH15 - AIR AND WATER

Which iron nail rusts? [Image_1: Four nails in test tubes labeled A (zinc coated nail), B (painted nail), C (nail in damp cloth), D (nail covered in ...

2009 Winter

Theory

CH15 - AIR AND WATER

A new planet has been discovered and its atmosphere has been analysed.[Image_1: A diagram showing a planet and its atmosphere is labeled]The table sho...

2009 Winter

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