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

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