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Form 3 Chemistry Sample Revision Questions With Answers

Form 3 Chemistry Sample Revision Questions With Answers

Lessons (20)

• 1.    A hydrocarbon undergoes the process represented by the equation below to produce two other hydrocarbons. #C_10 H_22->X + C_6H_14# (a) Name the process undergone by the hydrocarbon. b) State one condition necessary for the process.
  1m 37s

• 2.    Some moist iron wool was placed in a test tube and the tube was inverted and set up as shown below. The apparatus was left for one week. The water level rose and iron wool turned red-brown.Write the chemical equation to show the rusting of iron.
  1m 11s

• 3.    State two similarities between rusting and combustion.
  0m 24s

• 4.    The nitrates of the following metals were heated strongly and observation made accordingly. The nitrate of metal P produced the metallic oxide, Nitrogen (IV) oxide and oxygen gas; and that of metal Q produced the metallic nitrite and oxygen gas. The nitrate of R produced metal R, nitrogen (IV) oxide and oxygen gas. Arrange the metals in order of reactivity beginning with the most reactive.
  1m 41s

• 5.    Give two reasons why during preparation of salt, it is advisable to heat the solution to concentration allowing it to cool in order to crystallize instead of heating to dryness.
  0m 34s

• 6.    The apparatus below was set up to show the catalytic oxidation of ammonia. a) Write the equation between water and solid B. (b) State and explain two observations made in gas jar Y.
  1m 39s

• 7.    On complete combustion of a hydrocarbon gas X, 1.32g of carbon (IV) oxide and 0.54g of water were produced. Calculate the empirical formula of X (C = 12.0, H = 1, O = 16.0)
  3m 13s

• 8.    Dilute sulphuric (VI) acid reacts with aqueous sodium hydroxide to form a salt. Give the formula and name of the anion in the salt.
  0m 38s

• 9.    Hyrdogen gas is one of the lightest gas known but has not lived to its expectation to be used in Observation balloons. Explain
  0m 22s

• 10.    Using dots(.) and crosses(x), show bonding in magnesium chloride.
  2m 20s

• 11.    Carbon(IV) oxide is one of the main contributor to global warming.Name two other gases.
  0m 19s

• 12.    What is cloud seeding ?
  0m 14s

• 13.    Hydrogen Sulphide gas is bubbled into two solutions of metallic nitrate as represented in the flow chart below: Identify the cation present in: (i) Blue solution ii) Brown solution
  1m 14s

• 14.    State two uses of carbon (II) oxide
  0m 35s

• 15.    Carbon (II) oxide can be prepared in the laboratory by reacting thanedioc acid and another substance.Name this substance and its role in this reaction.
  0m 33s

• 16.    In an experiment, the student reacted charcoal with excess concentrated nitric (v) acid. State two observations made:
  0m 34s

• 17.    What volume of 0.5M hydrochloric acid solution will neutralize #20cm^3# solution of sodium carbonate containing 5.3 of anhydrous sodium carbonate per litre of solution . (Na = 23.0 C = 12.0 O = 16.0 H = 1.0 Cl = 35.5)
  2m 38s

• 18.    Give two reasons why dry ice (solid carbon (IV) oxide) is preferred in the preservation of perishable foodstuffs.
  0m 38s

• 19.    When 20.3g of a hydrated salt #( Y.6H_2 O)# was heated to dryness,9.5 g of the anhydrous salt was obtained. Determine the relative formula mass of the hydrated salt. (H = 1.0 O = 16.0)
  0m 38s

• 20.    The information in the table below relates to the element in the same group of the periodic table Study it and answer the questions that follow. Which element has the highest ionization energy? Explain
  0m 34s