i) Label the parts marked from A to F ii) What is the role of the apparatus marked E iii) Suggest the aim of this experiment iii) Suggest the name of this process iv) Define the process

1. List down any two (2) laboratory methods of preparation of hydrogen. (0 alama)
2. Label the parts marked from A to F (0 alama)
3. List down two (2) common laboratory methods of preparation of oxygen. (0 alama)
4. What is the role of the apparatus marked E (0 alama)
5. Suggest the name of this process (0 alama)
6. Define the process (0 alama)

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x. The highest temperature that can be reached by the burning fuel.

Match the following uses in LIST A with their corresponding items in LIST B. Write the letter of the correct answer in the table below.

1. Measure and indicate temperature. (1 alama)
2. Soothing chapped skin (1 alama)
3. Reducing muscle pain (1 alama)
4. Add reagents into flasks during experiment (1 alama)
5. Crushing or grinding substance (1 alama)
6. Cleaning wounds to kill germs (1 alama)
7. Treating mild bacterial infections on the skin (1 alama)
8. Measure specific volume of a liquid (1 alama)
9. Covering small wounds (1 alama)
10. Measure the mass of chemicals (1 alama)

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iii) The two types of hardness of water are __________________ hardness and _____________________ hardness.

1. Weed killers are _________________ substances that are used to destroy unwanted ___________________ which are harmful to crops. (2 alama)
2. The two types of hardness of water are ______ hardness and ______ hardness. (2 alama)
3. Stored chemicals in laboratory should be _________________ regularly to ensure they have not ________________________. (2 alama)
4. A radical is group of ___________ with ______________ electrons. (2 alama)
5. The process of separating a _________________ from a liquid is called ____________________. (2 alama)

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d) Find the oxidation state of underlined elements i) KClO 3 ii) Cr 2 O 2 7 2-

1. What is covalent bond? (0 alama)
2. List down any three (3) properties of covalent compounds (0 alama)
3. What is oxidation number? (0 alama)
4. Find the oxidation state of underlined elements: KClO 3 (0 alama)
5. What is covalent bond? (0 alama)
6. Find the oxidation state of underlined elements: Cr 2 O 2 7 2- (0 alama)
7. List down any three (3) properties of covalent compounds (0 alama)
8. What is oxidation number? (0 alama)
9. Find the oxidation state of underlined elements KClO 3 (0 alama)

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iv) 17CF ______________________________________________________

1. Draw the electronic configuration of 9Y and suggest if it is a metal or non-metal. (4 alama)
2. Define an atom. (2 alama)
3. List down any three (3) points of Dalton’s atomic theory. (3 alama)
4. What is electronic configuration? (2 alama)
5. Draw the electronic configuration of 3X and suggest if it is a metal or non-metal. (4 alama)
6. A radical is group of ___________ with ______________ electrons. (2 alama)
7. Draw the electronic configuration of 17CF and suggest if it is a metal or non-metal. (4 alama)
8. Draw the electronic configuration of 19K and suggest if it is a metal or non-metal. (4 alama)

Boresha ili kuona majibu ya mfano.

a) Define the following i) Nomenclature ii) Ionic compound b) Write the chemical formulae of the following compound i) Sodium chloride ii) Magnesium sulphate iii) Calcium chloride c) Calculate and write the molecular formula of the following compounds i) C₃H₆O₃ if its molecular mass is 180 ii) CH₂O if its molecular mass is 360

1. Define the following (0 alama)
2. Define Nomenclature (2 alama)
3. Define Ionic compound (2 alama)
4. Nomenclature (0 alama)
5. Ionic compound (0 alama)
6. Write the chemical formula of Sodium chloride (1 alama)
7. Write the chemical formulae of the following compound (0 alama)
8. Sodium chloride (0 alama)
9. Write the chemical formula of Calcium chloride (1 alama)
10. Magnesium sulphate (0 alama)
11. Calculate and write the molecular formula of the compound C₃H₆O₃ if its molecular mass is 180 (3 alama)
12. Calculate and write the molecular formula of the compound CH₂O if its molecular mass is 360 (3 alama)
13. Calcium chloride (0 alama)
14. Calculate and write the molecular formula of the following compounds (0 alama)
15. C₃H₆O₃ if its molecular mass is 180 (0 alama)
16. CH₂O if its molecular mass is 360 (0 alama)

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a) i) What is firefighting? ii) List down components needed to start a fire. iii) List down any two (2) domestic application of combustion b) i) What is portable fire extinguishers? ii) List down any three (3) precautions that should be taken when using fire extinguishers.

1. What is firefighting? (2 alama)
2. List down any two (2) domestic application of combustion (2 alama)
3. What is portable fire extinguishers? (1 alama)
4. List down any three (3) precautions that should be taken when using fire extinguishers. (2 alama)

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a) Define the following i) Noble gases ii) Halogens b) Write any four (4) properties of transition metals. c) i) What are metalloids? Give any two (2) examples ii) In the periodic table elements are classified into group number, what does this signifies (mean)?

1. Define Noble gases. (2 alama)
2. Define Halogens. (2 alama)
3. Write any four (4) properties of transition metals. (4 alama)
4. What are metalloids? Give any two (2) examples. (2 alama)
5. In the periodic table elements are classified into group number, what does this signifies (mean)? (2 alama)

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Below is an experimental apparatus arrangement done by a certain student at XYZ Secondary School.

1. List down chemicals that could be used in the preparation of oxygen and hydrogen. (6 alama)
2. List down chemicals that he could use in the preparation of oxygen and hydrogen. (2 alama)
3. Describe the function of each component in the apparatus. (5 alama)
4. Label the parts marked from A to F (0 alama)
5. Differentiate between the chemical test of oxygen and hydrogen. (8 alama)
6. Differentiate between chemical test of oxygen and hydrogen. (2 alama)
7. What is the role of the apparatus marked E (0 alama)
8. List two (2) industrial uses of oxygen. (6 alama)
9. List two (2) industrial uses of oxygen. (2 alama)
10. List down any two (2) laboratory methods of preparation of hydrogen. (2 alama)
11. Suggest the name of this process (0 alama)
12. Define the process (0 alama)
13. List down two (2) common laboratory methods of preparation of oxygen. (2 alama)

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ii) Write short essay on any three (3) environmental effects of using firewood as source of fuel.

1. What is global warming? (0 alama)
2. How can biogas be produced? (0 alama)
3. What is biogas? (0 alama)
4. Write short essay on any three (3) environmental effects of using firewood as source of fuel. (0 alama)

Boresha ili kuona majibu ya mfano.