Diagram 1 shows an aircraft filled with gas P. P gas consist of

The relative molecular mass of compound with empirical formula of CH2 is 42. Find the molecular formula of this compound. [Relative atomic mass: C = 12; H = 1]

Which statement explains why duralumin is harder than aluminium?

Which of the following gases have a double covalent bond? [Proton number ; H=1, N=7, O=8, Cl=17]

Diagram 2 shows the apparatus set-up of an experiment. Which of the following can be used to differentiate these solutions?

Diagram 3 shows the apparatus set up to study the reaction between chlorine water and potassium bromide solution. Which of the following substance can replace chlorine water to obtain the same observation?

The following is a balanced ionic equation.

2Al(s) + 3Cu2+(aq) → 2Al3+(aq) + 3Cu(s)

Which of the following statements regarding the above equation is correct?

Which of the following is correct about exothermic and endothermic reactions?

Which of the following process will produce ethanol from ethene?

The equation below shows combustion of ethanol.

C2H5OH + 3O2 → 2CO2 + 3H2O

Calculate the volume of carbon dioxide gas produced if 0.05 mol of ethanol is burnt completely.

[1 mol of gas occupied 24 dm3 at room temperature]

Diagram 4 is a structural formula of an organic compound. What is the name of the organic compound?

Table 1 shows the electron arrangement of element P and Q. What is the formula and the type of bond of the compound formed from the reaction between P and Q?

Diagram 5 shows the apparatus set-up of chemical cell using electrode pair of magnesium and copper. The blue copper(II) nitrate solution becomes fade. Which of the following explains the observation?

The following chemical equation shows the reaction of preparation silver chloride salt.

AgNO3 + KCI ---------> AgCl + KNO3

What is the volume of potassium chloride 0.5 mol dm-3 solution needed to produce 2.87 g silver chloride salt?

[Relative atomic mass of Ag= 108, Cl= 35.5]

Diagram 6 shows two volumetric flasks containing solutions of sulphuric acid and HX acid. Why is the concentration of hydrogen ions in sulphuric acid higher than in HX acid?

Table 2 shows the proton number of several elements. Which of the following pairs of elements react to form an ionic compound?

Diagram 7 shows a clock for home decor. It is made up of a substance which does not rust and looks nice. Which of the following shows the arrangement of particles in the substance used to make the clock?

Diagram 8 shows sweet potatoes which is slices into a small size for cooking. Why does small size of sweet potatoes cook faster than large size?

Diagram 9 shows a Periodic Table with four elements represented by letters A, B, C and D. Which of these elements has an electron arrangement of 2.8.7?

A compound with formula XCO3 has a relative formula mass of 125. What is the relative atomic mass of X? [Relative atomic mass of C = 12 and O = 16]

Diagram 10 shows a reagent bottle. Aiman accidentally pasted two labels on the bottle. Both copper(II) chloride and copper(II) sulphate solutions are blue. Which of the following chemicals can be used to help Aiman identify the solution in the reagent bottle?

Which characteristic of hydrogen chloride enables to show acidic properties in water?

Which of the following substances is acidic?

Which reaction has the highest rate of reaction?

Diagram 12 shows curve Y when 5 g zinc powder is reacted with 50 cm3 of 1.0 mol dm-3 hydrochloric acid. Which of the following reaction produces curve X?

Which compound is saturated hydrocarbon?

Which susbstance forms yellow precipitate when added to lead(II) nitrate solution?

Heating of P carbonate produces a product which is brown when hot and yellow when cold. What is P?

A farmer found that his soil is too acidic for some plants to grow well. Which substance is suitable to reduce the acidity of the soil?

What are the products formed when propane is burnt in excess oxygen?

I Water

II Carbon

III Carbon dioxide

IV Carbon monoxide

Which reaction is endothermic?

A rubber tapper finds that latex coagulates after several hours. What substance should be added into the latex to prevent it from coagulating?

Which substance conducts electric current in aqueous state?

Why carbon-12 was chosen as a reference standard for relative atomic mass and relative molecular mass?

What is the meaning of heat of neutralization?

Which of the following particles equal to 1 mole?

Which of the following is the characteristic of catalyst?

Table 3 shows the observations in three tests on solution X. What is X?

Which of the following is a soluble salt?

A mother wants to bake a cake which is sweet and attractive in colour. Which substance should be added into the cake?

Diagram 13 shows the apparatus set-up for the preparation of a salt. Which salt is prepared through this method?

Which of the following occurs in oxidation reaction?

A child spilled curry gravy on her school uniform. The stain was very hard to be removed after being washed with a type of detergent. Which additive should be added into a new detergent to make sure the stain can be removed?

The following equation represents the neutralisation reaction between barium hydroxide, Ba(OH)2 and hydrochloric acid, HCl

Ba(OH)2 + 2HCl → BaCl2 + 2H2O

What is the volume of 0.5 mol dm-3 hydrochloric acid needed to neutralize 25 cm3 of 0.l mol dm-3 barium hydroxide?

Diagram 14 shows the apparatus set-up to study the transfer reaction of electron at a distance. Which of the following occur at X and Y?

Pak Abu’s leg sprained during loosening the soil in his farm, Pak Abu asked his son to take substance X from the store and mix it into a plastic bag containing water. His son shook the plastic bag and pressed it onto the sprained part. What is substance X?

Diagram 15 shows the formation of acid rain in an industrial area. What is gas X?

Which of the following is the correct match of oxidation number of manganese, Mn with its corresponding compound?

Diagram 16 shows a part of heater found in an electric kettle regularly used by a housewife. In order to remove the white layer, the housewife need to add a substance into the kettle and leave for one hour before washing it with soap. What is the substance?