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

CH15 - AIR AND WATER

This question is about the first 30 elements in the Periodic Table. Name the element which: (a) is 78% of clean, dry air ................................

2022 Spring

Theory

CH4 - ATOMS COMBINING

(a) Add the missing state symbols to the chemical equation for the reaction.MgCO$_3$ ..... + 2HCl ..... $\rightarrow$ MgCl$_2$(aq) + H$_2$O ..... + CO...

2022 Spring

Theory

CH15 - AIR AND WATER

Nitrogen dioxide, NO$_2$, is an atmospheric pollutant and is formed in car engines.(a) Explain how nitrogen dioxide is formed in car engines.............

2022 Spring

Theory

CH13 - THE BEHAVIOR OF METALS

This question is about chemical reactions and electricity.(a) The diagram shows the apparatus used in the production of electrical energy in a simple ...

2022 Spring

Theory

CH17 - ORGANIC CHEMISTRY

This question is about alkanes and alkenes.(a) Short-chain alkanes and alkenes can be formed from long-chain alkanes in a chemical reaction.(i) Name t...

2022 Spring

Theory

Plastics

The names of four esters are listed. methyl propanoate ethyl propanoate propyl propanoate butyl propanoate (a) Esters are a family of organic...

2022 Spring

MCQ

CH1 - STATES OF MATTER

Which two gases will diffuse at the same rate, at the same temperature?

2022 Summer

MCQ

CH1 - STATES OF MATTER

A student measures the time taken for 2.0 g of magnesium to dissolve in 50 cm\(^3\) of dilute sulfuric acid. Which apparatus is essential to complete ...

2022 Summer

MCQ

CH3 - ATOMS AND ELEMENTS

The numbers of protons and neutrons and the electronic structures of four particles, W, X, Y and Z, are shown.[Table_1]Which particles have the same c...

2022 Summer

MCQ

CH3 - ATOMS AND ELEMENTS

Which substance should be pure for the intended use?

2022 Summer