DEMO|PAPER 111-QNS

 

THE MINISTRY OF EDUCATION, SCIENCE AND TECHNOLOGY.

AGAPE BOYS SECONDARY SCHOOL.

FORM THREE TERMINAL EXAMINATION JUNE 2023.

CHEMISTRY 1 CODE:032 /1

TIME:3:00 HRS

INSTRUCTIONS.

1. This paper consists of section A, B and C with a total of eleven (11)questions

2. Answer all questions in Section A and B. And two questions in section C

3. Section A carries 16 marks, section B carries 54 marks and section C carries 30 marks.

4. cellular phones and any unauthorized materials are not allowed in the examination room.

5. Write your name on every page of your answer sheet.

6. The following constant may be used.Atomic masses;H=1,C=12,O=16, N=14, Cl=35.5,Cu=64,=Pb= 207,Na=23, Ca=40, Mg=24

• Avogadro's number 6.02×10²³

• GMV at S.T.P=22.4dm³

• 1Faraday =96500 coulombs

• 1 litre =1dm³=1000cm³

SECTION A (15 MARKS)

1.For each of the items(i) - (x), choose the correct answer from the given alternatives and write its letter in the answer sheet(s) provided :

i) A student added a few drops of barium chloride solution to sodium sulphate solution he obtained a white precipitate instantly. Which of the following types of chemical reactions has been carried out by students?

1. Combination

2. Double displacement

3. Displacement

4. Decomposition

5. Redox

ii) A chemistry teacher from mbele secondary school heated a colorless solid compound, then brown fumes of a gas were evolved. The The colorless solid is most likely to be :

1. Ferrous sulphate

2. Silver chloride

3. Lead nitrate

4. Magnesium sulphate

5. Sodium peroxide

iii) If water does not easily form lather with soap, it is because of the presence of:

1. Sodium and calcium salts

2. Ammonium and aluminum salts

3. Calcium and magnesium salts

4. Zinc and aluminum salts

5. Iron salts

iv) What happens when an elements lose or gain an electron.

1. Isotopes are formed

2. Allotropes are formed

3. Molecules are formed

4. Ions are formed

5. Radicals are formed

V.If 0.5g of hydrogen gas is exploded in air, the mass of water formed is ;

1. 0.75g

2. 40g

3. 4.5g

4. 18g

5. 1.8g

Vi) An a aqueous solution turn red litmus paper into blue, excess addition of which solution would reverse the change :

1. Baking powder

2. Vinegar

3. Quick lime

4. Lime

5. Vinegar

Vii) A form three student wanted to perform a volumetric analysis experiment and he needed to measure a specific volume of solution X, what apparatus would he use to measure that liquid?

1. Burette

2. Volumetric flask

3. Measuring cylinder

4. Pipette

5. Beaker

Viii) Student discovered that it is impossible to light fire a vacuum due to absence of certain gas.What comment can give to a student?

1. Nitrogen is missing

2. Carbon Dioxide is missing

3. Oxygen is missing

4. Hydrogen is missing

5. Noble gas is missing

ix) When the table is dissolved in water, a salt solution is formed. This solution can be separated by a method known as

1. Sublimation

2. Paper of chromatography

3. Fractional distillation

4. Evaporation

5. Magnetization

x. Group I element burn in oxygen to form ;

1. Non-metal oxide

2. Metal oxide

3. Carbon Dioxide

4. Hydroxide

5. Metal carbonate

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