KCSE Chemistry Paper 1 2019 PDF – If You are among the Candidates that will be writing Chemistry in the upcoming KCSE exams this year, review the past paper 2, It is very helpful. After a successful download of the PDF of KCSE Chemistry Past Paper 1 for 2019, start practicing the KCSE Chemistry Paper 1 2019 consistently to see good results.

What to expect: kcse Chemistry past papers 2019, KCSE Chemistry Paper 3 2019, kcse Chemistry 2019 questions and answers, kcse Chemistry topics, KCSE Chemistry Paper 1 2019, KCSE Chemistry Paper 2… Keep reading…

There are KCSE Chemistry past Papers that will prepare You for the upcoming KCSE exams 2020, We believe that KCSE Chemistry questions and answers are worth It when it comes to revision for KCSE examinations. You must know that there are no new questions, it’s just a repetition of already-set Chemistry questions but in a different tricky form.

KCSE Chemistry PAPER 1 2019 with Answers

If You decide to buy the past revision Papers from us, the content of What You will receive for every order are as follows

• KCSE Chemistry Questions and answers
• KCSE Chemistry Marking Schemes
• Chemistry Prediction Questions

We will send the Past  Papers PDF to your email for You to download and study. But If You download the free version on this page, certainly the marking schemes may be limited and obviously the KCSE prediction questions are not attached.

If You have any problems or enquires about KCSE Chemistry Paper 1 2019, please visit portal.starbinet.com to post your questions and answers.

You can as well leave a comment below and We will respond accordingly.

Kenya Certificate of Secondary Education Chemistry Past Paper 

KCSE Chemistry Paper 1 2019

Chemistry KCSE 2019 Questions and Answers

CHEM paper 1

1. An atom of element A has mass number 39 and 19 protons.

(a) Write the electron arrangements of the atom (1 mark)

(b) State the pcriod and group to which elementt A belongs Group ………………………………….(½ mark)

Period …………………………………..(½ mark)

(c) State whether the element is a metal or a non-metal. (1 mark)

2. Describe how an increase in concentration increases the rate of a reaction. (2 mark)

3. The flow chart in Figure 1 represents some stages in the extraction of copper metal. Study it and answer the questions that follow.

(a) Identify :

(i) The copper ore (1 mark)

(ii) Process B (½ mark)

(iii) Solid C (½ mark)

(b) Write an equation for the reaction that forms the slag. (1 mark)

4. A monomer has the following structure.

CH= CH₂ ∣ C₆H₅

(a) Draw the structure of its polymer that contains three monomers.(1 mark)

(b) A sample of the polymer formed from the monomer has a molecular mass of 4992.

Determine the number of monomers that formed the polymer (C= 12; H= 1.0). (2 marks)

5. Hydrogcn has can be prepared by passing steam over heated magnesium ribbon as shown in the figure 2.

(a) Write an equation for the reaction that produces hydrogen gas. (I mark)

(b) Explain why the delivery tube must be removed from beneath the water before heating is stopped. (1 mark)

(c) Explain why sodium metal is not suitable for this experiment. (I mark)

6. A farmer intended to plant cabbages in his farm. He first tested the pH of the soil and found it to be 3.0.

If cabbages do well in alkaline soils, explain the advice that would be given to the farmer in order to realise a high yield.(2 marks)

7. A solution contains 40.3g of substance XOH per litre .250.0cm³of this solution required 30.0cm³ of 0.3M sulphuric(VI)acid for complete neutralisation. (a) Calculate the number of moles of XOH that reacted. (½ mark)

(b) Determine the relative atomic mass of X. (1½ mark)

8. Table 1 shows the properties of two chlorides, D and E.

Table 1

Chloride	Melting Points(°C)	Electrical Conductivity (liquid)
D	1074	Good
E	203	Poor

(a) State the type of bond present in:

(i) D…………………..(1 mark)

(ii) E…………………..(1 mark)

(b) Explain in terms of structure and bonding, the difference in electrical activity of the chlorides D and E. (1 mark)

9. Sulphur(IV) oxide is prepared in the laboratory using the set-up in Figure 3.

Study it and answer the questions that follow.

(a) Identify substance F. (1 mark)

(b) Write an equation for the reaction that takes place in the flask. (1 mark)

(c) State the purpose of liquid G. (1 mark)

The graph in Figure 4 was obtained when a certain substance was heated and its temperature recorded at regular intervals.

(a) State the purity of the substance. (1 mark)

(b) Explain the answer in (a). (1 mark)

11. Ethene is prepared in the laboratory by dehydration of ethanol.

(a) Name a suitable dehydrating agent used in this process. (1 mark)

(b) State the condition necessary for the reaction to occur. (1 mark)

(C) Write an equation for the dehydration process. (1 mark)

112.A boiling yube filled with chlorine was inverted in a trough containing the same ssolution and the set-up left in sunlight for about 2 hours.

(a) State the observation made in the boiling tube ( 1 mark)

(b) Explain the observation made in (a) (1 mark)

(c) Write an equation for the reaction that occurred in the boiling tube (1 mark)

13. 5 g of calcium carbonate was strongly heated to a constant mass.

Calculate the mass of the solid residue formed (Ca = 40.0; C = 12.0; 0 = 16.0). (2 marks)

14. During laboratory preparation of oxygen, manganese(IV) oxide is added to reagent 11.

(a) Name reagent H. (1 mark)

(b) State the role of manganese(IV) oxide in this experiment. (1 mark)

(c) Write the equation for the reaction that takes place. ( I mark)

15. Figure 5 shows an apparatus used to seperate a mixture of water and hexene.

(a) Name the apparatus in Figure 5. (1 mark)

(b) State the principle by which the mixture of the two liquids is seperated (1 mark)

(c) Identify the liquids, R and S if the density of hexene is 0.66 g/cm3.

(i) R …………… (½ mark)

(ii) S …………………. (½ mark)

16.(a) Complete the following table.(2 mark)

Solution	pH	Nature of solution
H	1.0
I		Neutral
J		Weak acid
K	13.0

(b) Explain why a solution of ammonia in methylbenzene has no effects on red litmus paper while in aqueous ammonia red litmus paper turns blue. (1 mark)

17. The heat of solution and hydration energy of potassium chloride is — 17.2 kJ and —689 kJ respectively.

Calculate the lattice energy of potassium chloride. (2 marks)

18. Use the information in Table 2 to answer the questions that follow.

Bond	Bond energy(KJ mol(<sub>-1</sub>
C-H	412
CI-CI	242
C-CI	338
H-C1	431

19. Given that the Eθ of CU(s),CU²⁺(aq)is + 0.34V and that 0f Zn(s)/Zn²⁺(aq)is- 0.76V,draw a labelled diagram of zinc and copper electrochemical cell. (3 marks)

20. During labomtory preparation of carbon(IV) oxide g tS. substance L in a conical flask.

(a) Identify substance L. (1 mark)

(b) Write an equation that produces carbon(IV) oxide. (1 mark)

(c) State the observations made when the gas produced WHS bubbled through calcium hydroxide solution for a long time. (1 mark)

21. Study the information in Table 3 and use it to answer the questions that follow. (I mark)

Elements	Na	Mg	Al	Si	P	S	Cl
Atomic Numbers	11	12	13	14	15	16	17
Atomic radii(nm)	0.157	0.136	0.125	0.117	0.110	0.104	0.099

(a) Explain the trend in atomic radii from sodium to chlorine. (1 mark)

(b) Explain how the chloride of aluminium differs from those of other metals in the period.(2 marks)

2. The diagram in figure 6 shows radiations emitted by a radioactive sample.

(a) Identify radiations:

(i) M ……………. (1 marks)

(ii) N ……………… (1 marks)

(b) Explain what would happen when a sheet of paper is placed in the path of the two radiations. (1 mark)

16/8 X 18/8 X are isotopes of element X.

They occur naturally in the ratio of 9:1 respectively.

Calculate the relative atomic mass of element X. (2 marks)

24. Starting with copper turnings, describe how a sample of copper (II) Sulphate crystals can be prepared in the laboratory. (2 marks)

25. Chemical tests were carried out on separate samples of water drawn from the same source. The observations made were recorded as shown in Table 4.

Test	Observation
(i) Addition of aqueous calcium chloride	No white precipitate
(ii) Addition of dilute sulphuric(VI) acid	No effervescence, colourless solution
(iii) Addition of a few drops of acidified barium nitrate	No white precipitate
(iv) Addition of aqueous ammonia	White precipitate dissolves

State the inferences made in reactions:

(i)……………………… (1 mark)

(ii)……………………….. (1 mark)

(iii)…………………………(1 mark)

26. 140cm₃of nitrogen gas diffuses through a membranc in 70 seconds. How long will it take 200 cm₃of carbon(iv) oxide gas to diffuse through the same membrane under the same conditions of temperature and presurre (3 marks)

27. When burning magnesium ribbon is introduced into a gas jar full of nitrogen, it continues to burn producing a greenish yellow powder.

(a) Write an equation for the reaction between nitrogen and magnesium. (I mark)

(b) Explain why magnesium continues to bum in nitrogen but sulphur does not. (2 marks)

(c) State one use of nitrogen. (I mark)

28. Draw in the space provided a labelled diagram of the set-up of the apparatus that can be used to electrolyse molten lead(II) bromide. (3 marks)

29. Name an appropriate apparatus that is used to prepare standard solutions in the laboratory.( I mark)

KCSE Chemistry Paper 1 2019 Questions and Answers

KCSE Chemistry Marking scheme Paper 1 – Chemistry and Government paper 1

The Marking Schemes will be available soon, Please Check back on this page later

If You want the marking schemes, send Us an email at: smartjohnene@gmail.com indicating your the subject and your name and We will guide You on How to get the documents.

KCSE Chemistry Paper 2 2019

->> Click Here to download Chemistry KCSE Paper 2 2019 PDF

KCSE Chemistry Paper 3 2019

->> Clcik to get the KCSE Chemistry Paper 3 2019 

After a successful purchase of the past Papers It is time for revision. Put in your best and get the best out of your KCSE Exams.

To purchase the Comprehensive KCSE Chemistry Past papers 2019 PDF, Go to the Matric Exam Papers Master Page

Navigation Panel:

We guess this information on KCSE Chemistry Papers 2019 PDF was really helpful, tell Us What You think in the comment session below. We wish to hear your views, do not forget to use the share buttons below to share with others.