Which of the following substances consists of molecule?
The proton number of atom R is 14 and its relative atomic mass is 28. Which statements is correct about R?
Diagram 1 shows the position of element X and element Y in the periodic table of elements. What is the chemical formula when element X reacts with element Y?
Which of the following substances can conduct electricity in molten state and aqueous solution?
Diagram 2 shows the apparatus set-up of electrolysis X electrolyte. Which of the following is X used to light up a bulb?
Which of the following is true about weak acid?
Which of the following salts is probably salt X?
Which of the following are properties of glass?
I - Transparent
II - React with chemical
III - Can be cleaned easily
IV - Heat conductor
Which method is the most suitable to increase the rate of reaction for the following equation?
4H2O2 --> O2 + 2H2O
Which statement is correct about fats and oils?
Which substance can be used to convert Fe3+ ions into Fe2+ ions?
Which of the following is true of an exothermic reaction?
What is the type of medicine for barbiturate?
Diagram 3 shows the graph of heating of solid Y. What is the boiling point of Y?
A balloon contains 12.04 x 1023 of gas particle. What is the number of moles of the gas in the balloon? [Avogadro's constant : 6.02 x 1023 mol-1]
Table 2 shows the electron arrangement of element R and Q. Element Q can form a compound with element R. What is relative molecular mass of the compound formed between element Q and R? [R.A.M.: Q= 35.5; R=12]
Table 3 shows the electron arrangement of elements P, Q, R and S. Which of the following pairs will form an ionic compound?
Diagram 4 shows the apparatus set-up for an experiment to electroplate a nail with copper. After 20 minutes, the students found no changes to the nail. What changes should be made to the experiment for it to succeed?
Which of the following substances ionizes partially in water?
Based on the results of the experiment, salt X is:
A plastic bag is made from a polymer called polyethene. Which of the following is the property of plastic bag?
The following equation represents the reaction between calcium carbonate and hydrochloric acid.
CaCO3 + 2HCL --> CaCl2 + CO2 + H2O
Which products is most suitable to be chosen to determine the rate of reaction?
A student wants to produce a rubber strip that is harder and resistant to heat. He dip the natural rubber strip in a beaker containing methylbenzene and substance Q. What is substance Q?
Ionic equation for the reaction between zinc and copper(II) ions solution, Cu2+ is shown below.
Zn + Cu2+ --> Zn2+ + Cu
Based on the equation, which substance undergoes oxidation?
Diagram 5 shows the energy level diagram for the precipitation reaction of silver chloride. Which of the following is true about the reaction?
Two cleaning agents, soap and detergent are used to wash clothes in sea water and river water. Which of the following pair is correct about the results obtained?I
What is the nucleon number of atom shown?
Which of the following is true about the atoms of elements Y and Z?
Element Z is located in the same group as chlorine in the Periodic Table. Z is not the actual symbol of the element.
Which of the following statements are the chemical properties of element Z?
Diagram shows the electron arrangement of a carbon dioxide molecule. Which of the following is true?
Table shows the observation for the reactions between metal N with two different salt solutions. Which of the following is correct ascending order of metal N, calcium and lead in the electrochemical series?
What are the products of the reaction between ethanoic acid and sodium oxide?
I - Water
II - Hydrogen
III - Ethyl ethanoate
IV - Sodium ethanoate
Diagram shows inland lake known as dead sea. In dry season, solid X is formed. During raining season all the solid X disappear. What are the properties of solid X?
I - Can be purified using recrystallization
II - Can conduct electricity in molten state
III - Consists of chloride and sulphate compounds
IV - Low melting and boiling point
Which of the following is the most suitable catalyst and conditions required for production of ammonia in industry?D
The following equation represents the reaction between sodium thiosulphate and sulphuric acid.
Na2S2O3 + H4SO4 --> Na2SO4 + H2O + SO2 + S
20cm3 distilled water is added to the mixture. What is the difference of adding distilled water to the mixture compared to without adding distilled water?
When but-1-ene is shaken with bromine water, the brown bromine water is decolourised. What is the product of this reaction?
Diagram shows the results of an experiment to investigate the effect of metals on the rusting of iron.
Based on the result above, arrange iron, X and Y in increasing order of electropositivity.
Diagram 10 shows the energy profile diagram for a reaction between P and Q.
What is the value of X?
What is the additive added in detergent to improve the function of detergent as cleaning agent in hard water?
The properties of the element will change when across the period from left to right in the periodic table of element?
Which of the following show the changes?
The electron arrangement of atom X is 2.8.5 and atom Y has 2 valence electrons. What is the type of bond and formula of compound formed between X and Y?
Table 8 shows information about four voltaic cells. What is the potential difference of the voltaic cell when metal B is paired with metal D?
A factory worker wants to remove the oxide layer on the surface of the steel used to make the body of a car. Which substance is suitable to be used for that purpose?
Diagram 11 shows smoke released from a factory. The main substance in the smoke causes the soil in the area to become infertile. Which substance can be used to solve this problem?
The following information are some of the uses of a manufactured substance Z in industry. Which substance is suitable as Z?
The reaction between nitric acid and magnesium is complete in 2 minutes and 5 seconds. Maximum volume of gas hydrogen produce is 50cm3. What is the average rate of reaction?
The molecular formula shown represents a food flavouring substance.
Which of the following can be used to make the flavouring?
Diagram shows the apparatus set-up to study transfer of electrons at a distance. Which of the following occurs at carbon electrode X and Y respectively?
The reaction between 50cm3 0.1mol dm-3 sodium iodide solution and 50cm3 0.1mol dm-3 lead(II) nitrate solution releases 4200J of heat. What is the change in temperature of the mixture?
[Specific heat capacity of solution = 4.2 J g-1 C-1. Density of solution = 1g cm-3]
Which pairs are correctly matched?V
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