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Form 1 Chemistry Sample Exam Revision Questions With Answers
Name an appropriate drying agent for hydrogen gas.
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Answer Text:
Concentrated sulphuric acid
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1.
Name two apparatus used in a chemistry laboratory to give accurate volume measurements.
2.
The table below shows the pH values of solutions J to N
3.
A mixture of hexane and water was shaken and left to separate as shown in the diagram below: State the identity of; i).P ii).W
4.
What is an acid base indicator?
5.
Explain why universal indicator may be preferred to acid base indicator.
6.
In very cold countries, salts are sprinkled on the roads during winter. i).Explain why this is important. ii).Give one negative effect of this.
7.
a).Name the apparatus shown below. b).State the use of this apparatus in the laboratory.
8.
During the Olympics, urine samples of five short-distance runners (1, 2, 3, 4 and 5) were taken and tested for the presence of two illegal steroids A and B by paper chromatography. Methanol was used as the solvent. A chromatogram from the test appeared as shown below. Study the chromatogram and answer the questions that follow. a).Which of the two steroids is most likely to be more-soluble
9.
Nitrogen is obtained on large scale by the fractional distillation of air as shown on the flow chart below.
10.
The diagram below shows a Bunsen burner which is used as a source of heat in the laboratory. (a).Name the parts labeled: A,B (b).Explain how the hotness of a non-luminous flame can be increased.
11.
Identify the laboratory apparatus used for: a).Holding and supporting pieces of apparatus such as burette during experiment
12.
A wooden splint was slipped through a region of a particular flame in the laboratory and was burnt as in the diagram below.
13.
Name the flame which is also called safety flame. Give reasons.
14.
State two reasons why most apparatus in the laboratory are made of glass.
15.
State any two differences between luminous and non-luminous flames
16.
Study the diagram below and answer the question that follows.
17.
Identify the elements present in the following compounds. i).Magnesium oxide. ii) Zinc chloride. iii) Sodium sulphate. iv) Aluminum nitrate.
18.
Write the names of the elements represented by symbols. i) K ii) Cl iii) Fe iv) Mg v) C vi) Be
19.
Define: i) Atom. ii) Compound. iii) Element.
20.
Complete the following. i) Acid + metal --> ii) Acid + Base --> iii) Acid + Carbonate -->
21.
Why is it important to put off naked flames that are not in use in the laboratory?
22.
What is a mixture?
23.
Define the term sublimation.
24.
The table below shows the PH values of solutions A, B, C and D a).Which solution is likely to be that of magnesium hydroxide? (b) Select the solution that reacts with calcium carbonate powder. Give a reason for your answer
25.
Ink from a signature that forged a cheque was compared with ink from pens of three suspects A, B, C using paper chromatography. The results were as follows; a) Describe how the ink was taken from the forged Cheque. b).Which suspect was guilty?
26.
In an experiment a gas jar containing some damp iron fillings was inverted in a trough containing some water and the set up was left for 3 days. a).Why was iron fillings moistened b).State and explain observation made after 3 days
27.
The table below shows pH values of solutions ABC and D a) Give solution that is; i) Acidic ii) Weak base iii) Neutral b).Give the products formed when solution A react with a carbonate salt.
28.
Oxygen gas can be prepared in the laboratory by decomposition of hydrogen peroxide. State a suitable catalyst.
29.
Study the diagram below and answer the questions that follow. a).Name the apparatus drawn above. b).State its use
30.
A form one student at Kirui High School wanted to separate and obtain iodine and sodium chloride (common table salt) from a mixture of the two. He set the experimental set up shown below. (a).The mixture was heated for some time and left to cool. On cooling, shiny black crystals and white crystals were observed on the surface of the watch glass and in the beaker respectively. Name:
31.
Describe how a simple acid-base indicator can be obtained from flower petals.
32.
Hydrogen can reduce coppers Oxide but not aluminum oxide. Explain
33.
When water reacts with potassium metal the hydrogen produced ignites explosively on the surface of water. (i) What causes this ignition? (ii) Write an equation to show how this ignition occurs
34.
The set-up below is used to investigate the properties of hydrogen. i) On the diagram, indicate what should be done for the reaction to occur ii) Hydrogen gas is allowed to pass through the tube for some time before it is lit. Explain iii) Write an equation for the reaction that occurs in the combustion tube. iv) When the reaction is complete, hydrogen gas is passed through the apparatus until the
35.
When zinc is heated to redness in a current of steam, hydrogen gas is obtained. Write an equation for the reaction.
36.
Name an appropriate drying agent for hydrogen gas.
37.
Hydrogen can be prepared by reacting zinc with dilute hydrochloric acid. Write an equation for the reaction.
38.
Explain why copper metal cannot be used to prepare hydrogen gas.
39.
Explain how hydrogen is used in the manufacture of margarine.
40.
Study the set-up below and answer the questions that follow. a).Between N and M which part should be heated first? Explain
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