1. CHEMISTRY DEPARTMENT WAID ACADEMY Standard Grade Topic 1

2. Approximately how many chemical elements are there? 1.About 50. 2.About 80. 3.About 100. 4.About 150. 12 Seconds Remaining

3. What is formed when two or more substances come together without reacting? 1.A compound. 2.A mixture. 3.An element. 4.A solution. 15 Seconds Remaining

4. Which line shows something that always happens in a chemical reaction? 1.A gas is given off. 2.Heat energy is absorbed. 3.A colour change occurs. 4.A new substance is formed. 15 Seconds Remaining

5. In a precipitation reaction 1.two solutions are mixed and a gas is given off. 2.two solutions are mixed and there is a colour change. 3.two solutions are mixed and heat energy is given out. 4.two solutions are mixed and an insoluble solid is formed. 15 Seconds Remaining

6. Which of following does not show a chemical reaction? 1.A match burning. 2.Water boiling in a kettle. 3.Frying an egg. 4.Glue setting. 12 Seconds Remaining

7. What is the symbol for caesium? 1.Cs 2.Cu 3.Co 4.Ca 12 Seconds Remaining

8. The name given to a solid which dissolves in a liquid is the 1.solution. 2.solvent. 3.solute. 4.saturate. 12 Seconds Remaining

9. Which elements has the symbol Ca 15 Seconds Remaining 1.Carbon.. 2.Caesium. 3.Californium. 4.Calcium.

10. In an exothermic reaction 1.Heat energy is given out. 2.Heat energy is taken in. 3.A gas is given off. 4.A solid is formed. 15 Seconds Remaining

11. Which elements are present in sodium carbonate? 1.Carbon and sodium. 2.Sodium and oxygen. 3.Sodium, hydrogen and oxygen. 4.Sodium, carbon and oxygen. 15 Seconds Remaining

12. Which metal gives an orange-red flame colour. (You may wish to refer to page 4 of the data booklet) 1.Calcium. 2.Sodium. 3.Copper. 4.Potassium. 15 Seconds Remaining

13. Which metal was discovered in the year 1775? (You may wish to refer to page 8 of the data booklet) 15 Seconds Remaining 1.Potassium. 2.Magnesium. 3.Zinc.. 4.Calcium.