MCQ

CH2 - SEPARATING SUBSTANCES

Impurities change the melting and boiling points of substances.Sodium chloride is added to a sample of pure water.How does the addition of sodium chlo...

2017 Summer

3

MCQ

CH2 - SEPARATING SUBSTANCES

In the chromatography experiment shown, which label represents the solvent front?

2016 Summer

2

MCQ

CH2 - SEPARATING SUBSTANCES

The diagram shows a chromatogram of four substances. Which substance has an $R_f$ value of approximately 0.32?

2017 Summer

1

MCQ

CH2 - SEPARATING SUBSTANCES

X is a mixture of colourless compounds. The diagram shows a chromatogram of X and of three pure compounds, P, Q, and R. Which statement is not correct...

2016 Summer

3

MCQ

CH2 - SEPARATING SUBSTANCES

The flow chart shows stages in the treatment of river water to produce drinking water. What occurs at stages X and Y?

2017 Winter

2

MCQ

CH2 - SEPARATING SUBSTANCES

During an experiment a measurement is recorded in cm$^3$.Which apparatus is used?

2017 Winter

2

MCQ

CH2 - SEPARATING SUBSTANCES

A student mixes 25 cm$^3$ samples of dilute hydrochloric acid with different volumes of aqueous sodium hydroxide. In each case, the student measures t...

2016 Winter

2

MCQ

CH2 - SEPARATING SUBSTANCES

A student carried out paper chromatography on a mixture of amino acids. The student sprayed the dried chromatogram with a locating agent. What is the ...

2017 Winter

3

MCQ

CH2 - SEPARATING SUBSTANCES

A sample contains a mixture of powdered limestone (calcium carbonate), sugar and wax.What is the correct way to obtain a pure sample of sugar?

2016 Winter

2

MCQ

CH2 - SEPARATING SUBSTANCES

Silver nitrate reacts with sodium chloride to produce silver chloride and sodium nitrate. The equation for the reaction is shown.$\text{AgNO}_3(\text{...

2017 Summer

1

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

1

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

2

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

2

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

2

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

2

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

1

MCQ

CH1 - STATES OF MATTER

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

2022 Summer

1

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

1

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

2

MCQ

CH3 - ATOMS AND ELEMENTS

Which substance should be pure for the intended use?

2022 Summer

1