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Form 2 Chemistry End Term 2 Exams 2021

Class: Form 2

Subject: Chemistry

Level: High School

Exam Category: Form 2 End Term 2 Exams

Document Type: Pdf


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Exam Summary


1[a] what is an atom? [1mk]

[b]Distinguish between atomic number and mass number [1mk]

2. Name two sub-atomic particles [2mks]

3. Element P has two isotopes #P^60# and #P^61# which occur in the ratio X: 2. Given that its R.A.M is 60.4. 3030
Calculate the value of X [3mks]

4. A patient went to the hospital and was diagnosed to have cold flu. The patient was prescribed to take drugs 1 x 3
[i]How and what hours in interval will the drugs be taken [2mks]

[ii]Supposing the patient took the drugs at 7.00a.m in the morning. What other hours of the day will the patient take the drugs [2mks]

5. Identify a suitable method that would be used to separate mixture of the following substances
[a]Iodine and potassium chloride [1mk]

[b]Water and ethanol [1mk]

[c]Table salt dissolved in water [1mk]

6. Fill the table below
7. Chemistry is a science subject that involves practicals that are done in the laboratory. Safety rules are given in order for the student to take precaution while in the laboratory
{i} State three such rules to be observed [3mks]

{ii} Most of the laboratory apparatus are made of glass. Give two reasons [2mks]

8. Njoki a form 2 student, was given a colourless liquid suspected to be water.
[a]Describe one chemical test she could use to identify the liquid. [2mks]

{b}Describe an experiment she could perform to ascertain its purity [2mks]

9. Two ions #X^(2+)# and #Y^(2-)# forms ions with ionic configurations 2.8.8 each
[a]Which of the ions is of an element in
[i]period 3
[ii]Group 2

[b]Given that element Y has a mass number of 32, draw the structure of its ions [2mks]

10. The form two students were given solutions P, Q and R in three different beakers. They put in red and blue litmus papers and recorded the results as shown below
Which of the solutions was most likely to be;
[i]Distilled water [1mk]

[ii] of an oxide of sodium. Explain your answer [2mks]

[iii]An oxide of sulphur. Explain your answer [2mks]

11.[a]Differentiate between prescription drugs and over the counter drugs [2mks]

[b]Name two commonly abused drugs in Kenya [1mk]

[c]State two physiological effects of drug abuse to the human body [2mks]

12. Study the grid below showing a section of the periodic table. The letters are not the actual chemical symbols of the elements
[a]State the letter that represents an element that
[i]Belongs to period 3 [2mks]

[ii]Belongs to group 2 [1mk]

[iii]Forms ions with a charge of +3 [1mk]

[iv]forms ions with a charge of +1 [1mk]

[v]Forms ions with a charge of -1 [1mk]

[b]What name is given the family to which elements K and W belong [2mks]

[c]How does the following compare? Explain your answer
[i]Atomic radius P and U [2mks]

[ii]Ionic and atomic radius of L [2mks]

[iii]ionic and atomic radius of U [2mks]

13.Form two students carried out paper chromatogram for mixture of K and substances A,B,C and D. study it and answer the questions that follow
[a]Label [2mks]
[b]What is the suitable solvent to use in this paper chromatogram [1mk]

[c]Identify the substances present in mixture N [3mks]

[d]Which of the pure substance was a compound of N [1mk]

[e]State two factors that determine the speed by which a substance in a solution moves up the absorption paper [2mks]

[f]State two application of paper chromatogram [2mks]

14.The chart below shows how the main components of air are separated. Study it and answer the questions that follow
[i]Gas x [1mk]

[ii]Gas y . [1mk]

[iii]The temperature at which Nitrogen is distilled out [1mk]
i. Process A [1mk]
ii. Reagent B [1mk]
iii. Substance C [1mk]
iv. Process D [1mk]
[c]What is the purpose of passing the air through compressor [1mk]

[d]Write the chemical equation of the reaction taking place when copper turnings are heated[1mk]

15.Study the table below and answer the questions that follow
[i]Explain why;
[a]A has a larger atomic radius than ionic radius [1mk]

[b]G has a smaller atomic radius than its ionic radius [1mk]

[c]Explain on the trend of melting point from A to C [2mks]

[d]Explain why D has the highest melting point [1mk]

[e]Why is G having smallest atomic size [1mk]


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