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Class notes

Class notes Chemistry Assessment2120
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12

July 2024

2023/2024
Question1. The rate of evaporation depends upon - (a) surface area (b)temperature (c) humidity (d) all of these Answer. Correct answer is (d) All of these - We known that evaporation is the surface phenomena, particle gain enough energy to overcome the force of attraction present in liquid and change into vapour state. - Evaporation is directly proportional to temperature, higher the temperature more will be the rate of evaporation. - Humidity is the amount of water vapour present i...
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Class notes

Class notes Chemistry Assessment2120
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199

July 2024

2023/2024
Prepared by: Daudi katyoki Kapungu O’Level Chemistry Notes - 2017 Nanguruwe Secondary school 2 FORM ONE NOTES Introduction to chemistry By Defn: Chemistry is a science that deals with the composition, structure and properties of matter Where: i. Matter is anything that has mass and occupies space. It includes the materials or substances of nature which make up our environment ii. The people who study Chemistry are called chemists. Those who studied Chemistry in ancient times are ...
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Exam (elaborations)

Exam (elaborations) Chemistry Assessment2120
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11

July 2024

2023/2024

A+
Section 1 – Basic Math 1. Round the following calculations to the proper number of significant figures: 2. Solve the following expression for f: m/c = w/f 3. Point D lies in the center of the equilateral triangle ABC. What is angle ADB (in degrees)?
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Exam (elaborations)

Exam (elaborations) Chemistry Assessment2120
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16

July 2024

2023/2024

A+
INSTRUCTIONS ● Answer all questions. ● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs. ● Write your name, centre number and candidate number in the boxes at the top of the page. ● Write your answer to each question in the space provided. ● Do not use an erasable pen or correction fluid. ● Do not write on any bar codes. ● You may use a calculator. ● You should show all your working and use appropriate units. INFORMATION ● The total ma...
leonardkinyua
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Exam (elaborations)

Exam (elaborations) Chemistry Assessment2120
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175

July 2024

2023/2024

A+
1. Which one of the following elements reacts with nitrogen when heated? A. Copper. B. Zinc. C. Sulphur. D. Magnesium. 2. The reaction in which vegetable oil is changed to margarine is called A. dehydration. B. hydrogenation. C. hydration. D. saponification. 3. Ethene was bubbled through a solution of bromine in tetrachloromethane. The structure of the compound formed is A. B. C. D. 4. Element X belongs to group II in the Periodic Table. The formula of the oxide of X is A. XO. B. X2O....
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Exam (elaborations)

Exam (elaborations) Chemistry Assessment2120
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144

July 2024

2023/2024

A+
1. What is thin-layer chromatography best used for separating? A. molecules of varying polarity B. molecules of similar polarity C. metals in an alloy D. water of crystallization from hydrated salts 2. Ice containing only the isotope 2 H sinks and does not melt when dropped into ordinary distilled water maintained at 3 C. Which statement is correct? A. The isotope 2 H has a high natural abundance. B. 2 H2O(s) has a higher melting point than normal ice. C. 2 H2O(s) has a lower d...
leonardkinyua
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Exam (elaborations)

Exam (elaborations) Chemistry Assessment2120
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4

July 2024

2023/2024

A+
1. What is thin-layer chromatography best used for separating? A. molecules of varying polarity B. molecules of similar polarity C. metals in an alloy D. water of crystallization from hydrated salts 2. Ice containing only the isotope 2 H sinks and does not melt when dropped into ordinary distilled water maintained at 3 C. Which statement is correct? A. The isotope 2 H has a high natural abundance. B. 2 H2O(s) has a higher melting point than normal ice. C. 2 H2O(s) has a lower d...
leonardkinyua
$11.49 More Info