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A student wants to study the relationship between the concentration of hydrochloric
acid and time of reaction by reacting the acid with magnesium ribbon.
What should be the responding variable ?
Which of the following atomic models was proposed by Ernest Rutherford?
Avogadro number is the number of
Use the information relative atomic mass for He =4, C=12, Cl =35.5 and Ca=40
The diagram shows a graph of temperature against time for the heating of
Which of the following is true about substance X at the sixth minute?
Among the following compounds, which one contains particles bonded by strong
The table shows the proton numbers for elements X, Y and Z.
What type of oxides are formed by X, Y and Z?
Which of the following conducts electricity but does not undergo chemical
The following equation represents changes that occur during the electrolysis of
molten copper( II ) oxide.
Cu2+ + me- Cu
2O2 – O2 + ne-
Which set of numbers correctly represent the value of m and n?
Which of the following substance is acidic ?
Which of the following is not true about the properties of alkali?
What is precipation reaction?
What substance is embedded into glass to make a photochromic glass?
Which of the following reactions, vanadium(V) oxide and the temperature of
C are required in the Contact Process?
Aluminium powder reacts faster with hydrochloric acid than an aluminium strip
The table shows the total volume of gas collected at regular intervals in a reaction
|Volume of gas (cm3 )||0||2.0||3.7||5.2||6.4||7.3||8.6||8.6|
What is the average rate of reaction in this experiment ?
From the diagram above, it can be concluded that
Which of the chemical substance can prevent the coagulation of latex?
Which of the following is not grouped in the same homologous series ?
The electron arrangements of atoms of elements P and Q are 2.8.4 and 2.6
Which of the following statements about the formation of a compound of P and Q
is true ?
What is the main purpose of using superconductors?
Which of the following is an insoluble salt?
The diagram shows the arrangement of particles for a type of matter that
undergoes a change in physical state through process X.
What is process X?
The table shows the melting points and boiling points of substances S, T, U, V
|Boiling point/ o C|
|S||– 182||– 162|
Which substance exists as a gas at room temperature?
The table below shows the proton number of elements M and N
Which is true of the compound formed between elements M and N?
In which set of the following pair of metals would electron flow in the direction as
in the diagram?
What is the number of atoms in 1 mole of ammonia, NH3?Use the information that the Avogadro Constant 6.02 X 1023 mol-1
The chemical formula for glucose is C6H12O6. This shows that
I the empirical formula for glucose is CH2O
II each glucose molecule is made up of 6 carbon atoms, 12 hydrogen atoms
and 6 oxygen atoms.
III 1 mol of glucose contains a total of 144 x 1023 atoms
IV One glucose molecule has a mass of 180 times higher than the mass of 1
Use the information relative atomic mass for H =1,C =12 and O =16
Avogadro Constant = 6.02 X 1023 mol-1
What is the percentage by mass of nitrogen content in urea, CO(NH2) 2 ?
Use the information that the relative atomic mass of C = 12 , N =14, H=1
and O = 16
A meteorologist would like to release a weather balloon to the amosphere to
carry out studies on the weather.
Between A, B, C and D in the Periodic Table shown below which is the most
suitable element to fill up the weather balloon?
The diagram shows the electron arrangement of a substance formed between two
atoms of Z.
Which of the following statements is true about the substance?
When 10 cm3 of 0.50 mol dm-3 NaOH is diluted with water to 100 cm3 , the
concentration of NaOH solution is
The reaction between lead (II) nitrate and potassium iodide solution is represented
by the equation below
Pb(NO3)2 (aq) + 2KI (aq) → PbI2 (s) + 2KNO3 (aq)
of 1.0 mol dm-3 potassium iodide solution is mixed with 25.0 cm3
mol dm-3 lead (II) nitrate solution. What is the maximum mass of lead(II) iodide
produced in this reaction?
Use the information relative atomic mass for I = 127 and Pb = 207
Which of the following is NOT a characteristic of ammonia?
1g of magnesium was allowed to react with 50 cm3 of sulphuric acid, 1 mol dm-3.
Three experiments were conducted using three different sizes of magnesium. The
time taken to collect 20cm3 of hydrogen gas is as below.
|Time / s||16||7||25|
Which of the following experiments show the arrangement of the size of
magnesium in decreasing order?
The diagram below is a structural formula of a polymer.
What is the structural formula of the monomer for the above polymer?
A compound with formula M2CO3 has a relative formula mass of 138.
What is the relative atomic mass of M ?
Use the information that the relative atomic mass of C = 12 and O = 16
Study the structural formula below:
Based on the IUPAC system, what is the name of the compound having this
Butane has some similar characteristics with butene. The characteristics are
I Exist as gas at room temperature.
II Decolourise the purple colour of acidified potassium manganate(VII).
III Cannot dissolve in water.
IV Burn in excess air to produce a gas that turns limewater cloudy.
Two experiments were conducted to study the rate of reaction between excess
calcium carbonate and sulphuric acid as shown below.
|I||25cm3 H2 SO4, 1 mol dm-
|II||50cm3 H2 SO4, 0.5 mol dm –
Which of the following graphs best describes the results of the above
The relative atomic mass of metal Q is 7 and the relative atomic
mass of the metal W is 56
Which of the following conclusions can be drawn from the above statement?
I 1 mol of W has 8 times more atoms than 1 mol of Q
II 1 atom of W is 8 times heavier than 1 atom of Q
III 1 atom of W has the same number of protons with 8 atoms of Q
IV 56 g of W has the same number of atoms as in 7 g of Q
The equation shows neutralization reaction between W hydroxide solution and
W(OH)2 + 2HNO3 → W(NO3)2 + 2H2O
of W hydroxide solution 0.5 mol dm-3 neutralized 20 cm3
of nitric acid.
What is the concentration of the nitric acid needed?
An esterification reaction is given as follows:
Propanoic acid + ethanol Q + H2O
What is the molecular formula of ester Q?
Below are the symbols of element X and Z.
If elements X and Z combine together to form an alloy Q, what is the
arrangement of atoms in alloy Q?
The equation below represents the reaction to extract aluminium from aluminium
2Al2O3 → 4Al + 3O2
What is the mass of aluminium that can be extracted from 51 g of aluminium
Given that relative atomic mass of Al = 27 and O = 16
Between these aqueous solutions, which will give the increasing number in pH
The table shows the number of electrons, proton number and number of
neutrons for particles X and Y.
|Proton number||Number of
Which of the following conclusions is correct for X and Y?
The combustion of methane is as follows:
CH4 + 2O2 → CO2 + 2H2O
If 100 cm3 of methane is burnt in excess air, what is the volume of carbon
dioxide gas given off at room conditions?
Given that 1 mol of gas occupies 24 dm3 at room conditions.