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

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 XB. W and YC. X and YD. X and Z

2009 Summer

Theory

CH2 - SEPARATING SUBSTANCES

A student takes 2 g samples of calcium carbonate and adds them to 20 cm3 samples of dilute hydrochloric acid at different temperatures. She measures h...

2009 Summer

Theory

CH2 - SEPARATING SUBSTANCES

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

CH2 - SEPARATING SUBSTANCES

A student carries out an experiment to prepare pure magnesium sulfate crystals.The diagram shows the first stage of the preparation.He adds magnesium ...

2009 Winter

Theory

CH2 - SEPARATING SUBSTANCES

A student separates salt from a mixture of salt and sand.What is the correct order of steps for the student to take?A filter → evaporate → shake w...

2009 Winter

Theory

CH2 - SEPARATING SUBSTANCES

A student separates salt from a mixture of salt and sand. What is the correct order of steps for the student to take? A filter → evaporate → shak...

2009 Winter

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

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

CH3 - ATOMS AND ELEMENTS

The table shows the numbers of protons, neutrons and electrons in particles A to I.[Table_1]Answer the following questions about particles A to I. Eac...

2021 Spring

Theory

CH15 - AIR AND WATER

The elements shown are gases at room temperature and pressure.hydrogennitrogenoxygenchlorine(a) State which one of these gases is green..................

2021 Spring

Theory

CH16 - SOME NON-METALS AND THEIR COMPOUNDS

This question is about ammonia.(a) Nitrogen reacts with hydrogen to form ammonia in an industrial process.$$N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(...

2021 Spring

Theory

Concentration and Titration

A student wanted to make some zinc chloride crystals. The student followed the procedure shown. step 1 Add excess zinc powder to dilute hydrochlor...

2021 Spring

Theory

Plastics

The table shows the names or structures of organic compounds P to U. (a) Give the letters of the organic compounds, P to U, that are unsaturated hy...

2021 Spring

Theory

CH18 - POLYMERS

Polymers are large molecules built up from small molecules.(a) State the name given to the small molecules from which polymers are made..................

2021 Spring

MCQ

CH1 - STATES OF MATTER

A gas is released at point P in the apparatus shown. Which gas turns the damp universal indicator paper red most quickly?

2021 Summer

MCQ

CH2 - SEPARATING SUBSTANCES

A mixture is separated using the apparatus shown. What is the mixture?

2021 Summer

MCQ

CH2 - SEPARATING SUBSTANCES

Which statement about paper chromatography is correct?

2021 Summer

MCQ

CH3 - ATOMS AND ELEMENTS

Element X has 7 protons. Element Y has 8 more protons than X. Which statement about element Y is correct?

2021 Summer