WAEC (WASSCE) Chemistry · Matter, atoms and chemical combination
States of matter: WAEC Chemistry Past Questions and Answers
What the WAEC syllabus covers in States of matter
Our summary: The kinetic theory, changes of state and diffusion, the gas laws, and the properties of liquids, vapours and solids.
- Kinetic theory of matter ((1) Postulates of the kinetic theory of matter. (2) Use of the kinetic theory to explain the following processes: melting of solids, boiling of liquids, evaporation of liquids, dissolution of solutes, Brownian motion and diffusion.)
- Changes of state of matter ((1) Changes of state of matter should be explained in terms of movement of particles. It should be emphasized that randomness decreases (and orderliness increases) from gaseous state to liquid state and to solid state and vice versa. (2) Illustrations of changes of state using the different forms of water, iodine, sulphur, naphthalene etc. (3) Brownian motion to be illustrated using any of the following experiments: (a) pollen grains/powdered sulphur in water (viewed under a microscope); (b) smoke in a glass container illuminated by a strong light from the side; (c) a dusty room being swept and viewed from outside under sunlight.)
- Diffusion ((1) Experimental demonstration of diffusion of two gases. (2) Relationship between speed at which different gas particles move and the masses of particles. (3) Experimental demonstration of diffusion of solute particles in liquids.)
- Gases: characteristics and nature of gases (Arrangement of particles, density, shape and compressibility.)
- Gases: the gas laws (The gas laws: Charles'; Boyle's; Dalton's law of partial pressure; Graham's law of diffusion, Avogadro's law. The ideal gas equation of state. Qualitative explanation of each of the gas laws using the kinetic model. The use of kinetic molecular theory to explain changes in gas volumes, pressure, temperature. Mathematical relations of the gas law PV = nRT. Ideal and real gases. Factors responsible for the deviation of real gases from ideal situation.)
- Gases: laboratory preparation and properties of some gases ((1) Preparation of the following gases: H₂, NH₃ and CO₂. Principles of purification and collection of gases. (2) Physical and chemical properties of the gases.)
- Liquids (Characteristics and nature of liquids based on the arrangement of particles, shape, volume, compressibility, density and viscosity.)
- Vapour and gases ((1) Concept of vapour, vapour pressure, saturated vapour pressure, boiling and evaporation. (2) Distinction between vapour and gas. (3) Effect of vapour pressure on boiling points of liquids. (4) Boiling at reduced pressure.)
- Solids: characteristics and nature ((1) Ionic, metallic, covalent network and molecular solids. Examples in each case. (2) Arrangements of particles ions, molecules and atoms in the solid state.)
- Solids: types and structures (Relate the properties of solids to the type of interatomic and intermolecular bonding in the solids. Identification of the types of chemical bonds in graphite and differences in the physical properties.)
- Solids: properties of solids
- Structures, properties and uses of diamond and graphite (The uses of diamond and graphite related to the structure. The use of iodine in everyday life.)
- Determination of melting points of covalent solids (Melting points as indicator of purity of solids e.g. phenyl methanoic acid (benzoic acid), ethanedioic acid (oxalic) and ethanamide.)
Syllabus content © The West African Examinations Council (WASSCE (harmonised West African syllabus)).
WAEC (WASSCE) Chemistry questions on States of matter
- WAEC 2024Which of the following substances has the lowest boiling point?
- WAEC 2023The following statements are correct except
- WAEC 2023The relative molar mass of a gaseous hydrocarbon is 30. Determine its vapour density.
- WAEC 2023Which of the statements about gases is not correct?
- WAEC 2023Which of the following gases has the lowest rate of diffusion? [H=1.0, C=12.0, N = 14.0, O= 16.0]
- WAEC 2023Which of the following properties does not give evidence of the kinetic theory of matter?
- WAEC 2023Which of the following laws or theory cannot be explained by the application of the kinetic theory of gases?
- WAEC 2023The gas that is less dense than air is
- WAEC 2023A compound that could be dried by using conc. tetraoxosulphate (VI) acid and not by calcium oxide is likely to be
- WAEC 2022What number of moles of oxygen would exert a pressure of 10 atm at 320 K in an 8.2 dm ^ 3 cylinder? [R=0.082 atm dm ^ -3 mol ^ -1 K ^ -1 ]
- WAEC 2022Which of the following statements about liquids is/are true? I. Liquids maintain their volume at constant temperature. II. Liquids have fixed shape III. Liquids…
- WAEC 2022When air in a syringe is compressed such that there is no change in temperature, the
- WAEC 2022What is the partial pressure of oxygen at s.t.p. in a gaseous mixture containing 100 cm3 of oxygen and 900 cm3 of nitrogen gas?
- WAEC 2021What number of moles of oxygen would exert a pressure of 10 atm at 320 K in an 8.2 dm ^ 2 cylinder? [R = 0.082 atm dm ^ 3 mol ^ -1 K ^ -1 ]
- WAEC 2021Under which conditions of pressure (p) and temperature (T) would the volume of an inflated ballon increase? When
- WAEC 2021The collision between ideal gas molecules are considered to be perfectly elastic because
- WAEC 2020The initial volume and pressure of a given mass of gas is V and 3.P. What is its pressure if its volume is increased to 2V at constant temperature?
- WAEC 2019in Boyle's law?
- WAEC 2019In a mixture of gases which do not react chemically together, the pressure of the individual gas is?
- WAEC 2019The method used to collect gas in the laboratory depends on its? I. boiling point II. density III. smell IV. solubility in water
- WAEC 2018Particles in a solid exibit
- WAEC 2018Pure water can be made to boil at a temperature lower than 100°C by
- WAEC 2018Which of the following statements best explains the difference between a gas and a vapour?
- WAEC 2016The general gas equation PV/T = K is a combination of
- WAEC 2016Which of the following bonds are broken when ethanol is boiled? I. Covalent bonds II. Ionic bonds III. Hydrogen bonds
- WAEC 2016Propane carbon(IV)oxide diffuse at the same rate because [H = 1.00, C = 12.0, O = 16.0]
- WAEC 2016The spreading of the scent of a flower in a garden is an example of … ?
- WAEC 2016Which of the following statements about solids is correct?
- WAEC 2015Which of the following statements about intermolecular distances and cohesive forces between gas is correct? They are
- WAEC 2015The general gas equation was deprived from … ?
- WAEC 2015Which of the following gases is monoatomic?
- WAEC 2015Which of the following gases will diffuse most rapidly? [H = 1.00, C = 12.0, O = 16.0, S = 32.0, Cl = 35.5]
- WAEC 2014Which of the following relationships correctly expresses the Boyle's law?
- WAEC 2014Which of the following statements about volatile liquids is correct? They have
- WAEC 2014The vapour pressure of a given volume of liquid increase when the
- WAEC 2013Which of the following phenomenna lead to decrease in volume of a liquid in an open container?
- WAEC 2013Which of the following gases are arranged in increasing order of diffusion rate? [H = 1 .0; C = 12; N = 14; O = 16; S = 32]
- WAEC 2013The pressure exerted by a gas is a function of the
- WAEC 2013The gas law which describes the relationship between volume and temperature is
- WAEC 2013Which of the following variables is a measure of the average kinetic energy of the molecule of a gas?
- WAEC 2012The postulate that molecules are in constant random motion best explains why liquids
- WAEC 2012When a substance changes directly from the solid state to the gaseous state without forming a liquid, the substance is said to
- WAEC 2012Which of the following gases has the lowest rate of diffusion under the same condition? [H = 1.00; He = 4. 00; O = 16.0; CI = 35.5]
- WAEC 2012The vapour pressure of a liquid depends on l. temperature. ll. rate of condensation. III. cohesive forces holding the particles together
- WAEC 2011The initial volume of a gas at 300 K was 220 cm 3 Determine its temperature if the volume became 250 cm 3
- WAEC 2011A gas that is collected by upward delivery is likely to be
- WAEC 2011The equation P = K/V illustrates
- WAEC 2010Which of the following metals exists as liquid at ordinary temperature?
- WAEC 2010A given volume of oxygen diffused through a porous partition in 8 seconds. How long would it take the same volume of carbon (IV) oxide to diffuse under the same…
- WAEC 2010What is the volume occupied by 2 moles of ammonia at s.t.p?
Years with States of matter questions in DeeepSolve's question bank
From the past questions DeeepSolve holds, not a count of everything the exam body has set.
- 2024
- 2023
- 2022
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- 2016
- 2015
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