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…
Combined Science Chemistry Section Multiple Choice (Page 1) The diagram shows the electronic structure of an atom of a certain element, Z. Z will most likely form: A. Z+ ions…
Mixed Revision Questions and Answers (Page 1) Question 1 Use the table below to answer the questions that follow: SubstancepH A1 B5 C7 D9 E14 a) Which substance is a…
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?…
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…
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…
Combined Science Practice Questions. Combined Science practice questions for Zimsec O'level Students. I have divided them into sections in which they belong. I will upadate the answers and explanations later…