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O level Questions and Answers

Acids, Bases and Salts Question 2
Combined Science Revision

Acids, Bases and Salts Question 2

Acids, Bases and Salts Question 2 The table below shows the effect of three substances A, B and C on universal indicator solution. substance effect on universal indicator solution A red B green C purple i. State the function of the universal indicator solution. [1] ii. Deduce the nature of Read more…

By Sydney Chako, 10 monthsJuly 26, 2021 ago
Acids, Bases and Salts Question 1
Combined Science Revision

Acids, Bases and Salts Question 1

Acids, Bases and Salts Question 1 Calcium sulphate can be formed by the reaction between calcium carbonate and solution X. Two other substances are produced in this reaction. Name solution X. [1] Name the other two products. [2] Name the type of reaction that occur between calcium carbonate and X. Read more…

By Sydney Chako, 10 monthsJuly 26, 2021 ago
Atomic Structure and Bonding
Combined Science Revision

Atomic Structure and Bonding Question 2

Atomic Structure and Bonding Question 2 Chlorine has two types of atoms as shown, 35Cl and 37Cl.i. State the name given to the two types of chlorine atoms shown. [1]ii. Calculate the number of neutrons in 35Cl. [1] Chlorine reacts with sodium to form sodium chloride (NaCl).i. Name the type Read more…

By Sydney Chako, 10 monthsJuly 25, 2021 ago
Acids Bases and Salts Questions and Answers (O level Chemistry)
O level Chemistry Notes

Acids Bases and Salts Questions and Answers (O level Chemistry)

Acids Bases and Salts Questions and Answers (O level Chemistry) Question 1 Acids are neutralised by alkalis. Write the ionic equation for the reaction between an acid and an alkali. Sodium sulphate is a soluble salt that can be prepared using a titration method.(i) Name a sodium compound and an Read more…

By Sydney Chako, 1 yearFebruary 20, 2021 ago
Stoichiometry Questions and Answers (Page 3)
O level Chemistry Notes

Stoichiometry Questions and Answers (Page 3)

Stoichiometry questions and answers (Page 3) Question 1 Copper reacts with concentrated nitric acid as shown by the equation below: Cu(s) + 4HNO3(aq) → Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) Suggest one observation made when copper reacts with concentrated nitric acid. (i) Suggest the name of the salt of formula Cu(NO3)2.(ii) Read more…

By Sydney Chako, 1 yearFebruary 20, 2021 ago
Mixed Revision Questions and Answers
Combined Science Revision

Combined Science Questions (Page 2)

Combined Science Revision Solution 1 Air is cooled to -78°C. Water and carbon dioxide are removed as solids. The remaining air is further cooled by a process of rapid compression and expansion until it reaches a temperature of -200°C. At this temperature all gases are liquids except for rare gases. Read more…

By Juliet Muturuki, 2 yearsJuly 5, 2020 ago
Mixed Revision Questions and Answers
Combined Science Revision

Combined Science Questions (Page 1)

Mixed Revision Questions and Answers (Page 1) Question 1 Use the table below to answer the questions that follow: Substance pH A 1 B 5 C 7 D 9 E 14 a) Which substance is a weak alkali? b) Which substance could be water? c) Which substance is a weak Read more…

By Sydney Chako, 2 yearsJune 20, 2020 ago
Metals
Combined Science Revision

Metals Questions and Answers (Page 1)

Metals Questions and Answers (Page 1) Question 1 Potassium is a metal above magnesium in the reactivity series. How would you expect it to react with (a) oxygen (b) water? Solution 1 (a) Reacts vigorously with oxygen (b) Reacts vigorously with water Question 2 A metal does not react with Read more…

By Juliet Muturuki, 2 yearsJune 17, 2020 ago
organic chemistry
Combined Science Revision

Organic Chemistry Questions (Page 1)

Organic Chemistry Questions and Answers (Page 1) Question 1 The hydrocarbon methane is the first member of the alkanes homologous series. a) Draw diagrams to show the first 3 members of the alkanes homologous series. b) What substances will be formed when methane burns in plentiful air supply? How would Read more…

By Sydney Chako, 2 yearsJune 17, 2020 ago
Acids, Bases and Salts Questions (Page 1)
Combined Science Revision

Acids, Bases and Salts Questions (Page 1)

Acids, Bases and Salts Questions and Answers (Page 1) Question 1 Dry hydrogen chloride gas does not turn blue litmus paper red. It dissolves in water and toluene. Some properties of the two solutions are listed below: HCl in toluene HCl in water Nuetral to litmus Turns litmus paper red Read more…

By Juliet Muturuki, 2 yearsJune 14, 2020 ago

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