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9F
Key Stage 3 Science
| Question | Answer |
|---|---|
| Describe the difference in observations you would see between the reaction of Calcium and Iron with hydrochloric acid. | Calcium will produce vigorous bubbles. Iron will produce a small amount of bubbles |
| Describe the difference in observations you would see between the reaction of Potassium and Calcium with water | Potassium will catch fire. Calcium will bubble vigorously |
| Write a balanced symbol equation to show the reaction of potassium with hydrochloric acid | 2K + 2HCl -->2 KCl + H2 |
| Write a balanced symbol equation to show the reaction of sodium with water | 2Na + 2H2 O --> 2NaOH + H2 |
| Explain what you would see when• zinc is added to copper sulfate• copper is added to zinc sulfate | • Red solid copper is formed because Zinc displaces copper from copper sulfate as it is more reactive than copper• No reaction because copper is less reactive than zinc so cannot displace zinc from zinc sulfate |
| Describe the tests for oxygen and hydrogen | • Oxygen: A glowing splint put into to the unknown gas relights •Hydrogen. A Lighted splint put into the unknown gas produces a pop sound |
| Describe the test for carbon dioxide | Bubble unknown gas through limewater. If the limewater goes cloudy then the gas is carbon dioxide |
| State the two differences between exothermic and endothermic chemical reactions | •Exothermic reactions give out heat, Endothermic reactions take in heat.•Exothermic reactions increase the temperature of the surroundings, Endothermic reactions decrease the temperature of the surroundings |
| State the definition of an ore | A naturally occuring material from which enough metal can be extracted to make a profit |
| State how copper and aluminium are extracted from their ores | Copper is extracted by heating with carbon, Aluminium is extracted by electrolysis |
| Why can't Aluminium be extracted from its ore by heating with carbon | Aluminium is more reactive than carbon |
| Why is copper not extracted from its ore by electrolysis | It is too expensive |
| Explain how gases exert a pressure in terms of their particles | Gas particles collide with the walls of the containor |
| Explain three ways of increasing gas pressure |
Created by:
Davenant Foundation School
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