Theory

Chemical Properties of Acids and Bases

This question is about reactions of bases and acids. (a) Ammonia is a gas at room temperature. What is the test for ammonia gas? Describe the positive...

2020 Summer

1

Theory

Chemical Properties of Acids and Bases

This question is about nitrogen and compounds of nitrogen.(a) Nitrogen molecules have the formula $\text{N}_2$.Some properties of nitrogen are shown: ...

2022 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

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

1

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

1

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

1

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

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

1

MCQ

CH3 - ATOMS AND ELEMENTS

Which substance should be pure for the intended use?

2022 Summer

1