# Metals and the reactivity series

> Grade 9: order of reactivity (potassium to gold), metals with acids give hydrogen, displacement reactions, rusting, extracting metals.

Source: https://olyclass.com/library/science-g9-reactivity-series-en/

- Subject: Science
- Level: Grade 9
- Quiz: 16
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## Questions

1. Which of these metals is the most reactive? (Copper / Iron / Magnesium / Potassium)
   Answer: Potassium
2. Which metal is the least reactive? (Aluminium / Gold / Sodium / Zinc)
   Answer: Gold
3. Which list is in order from most reactive to least reactive? (Copper, zinc, magnesium, sodium / Magnesium, copper, sodium, zinc / Sodium, magnesium, zinc, copper / Zinc, sodium, copper, magnesium)
   Answer: Sodium, magnesium, zinc, copper
4. Which gas is made when magnesium reacts with dilute hydrochloric acid? (Carbon dioxide / Chlorine / Hydrogen / Oxygen)
   Answer: Hydrogen
5. Which test shows hydrogen gas is present? (A glowing splint relights / A lit splint makes a squeaky pop / Damp litmus paper turns white / Limewater turns cloudy)
   Answer: A lit splint makes a squeaky pop
6. Copper reacts quickly with dilute hydrochloric acid to give hydrogen.
   Answer: False
7. Zinc is added to copper sulfate solution. What happens? (Copper displaces zinc / Hydrogen gas is made / Nothing happens / Zinc displaces copper)
   Answer: Zinc displaces copper
8. A more reactive metal can displace a less reactive metal from its compound.
   Answer: True
9. Will iron displace magnesium from magnesium sulfate solution? Yes or no?
   Answer: No, because iron is less reactive than magnesium
10. Which two things are needed for iron to rust? (Hydrogen and salt / Nitrogen and water / Oxygen and carbon dioxide / Oxygen and water)
   Answer: Oxygen and water
11. Which method does NOT help to prevent iron from rusting? (Coating it with oil / Galvanising it with zinc / Leaving it in damp air / Painting it)
   Answer: Leaving it in damp air
12. Rusting is a chemical change that makes a new substance.
   Answer: True
13. Which metal at the very bottom of the reactivity series is often found uncombined?
   Answer: Gold
14. How is iron extracted from its ore in a blast furnace? (Adding the ore to acid / Cooling the ore with water / Heating the ore with carbon (coke) / Mixing the ore with sodium chloride)
   Answer: Heating the ore with carbon (coke)
15. Why is aluminium not extracted by heating its ore with carbon?
   Answer: It is more reactive than carbon (electrolysis is used)
16. Which method is used to extract very reactive metals such as aluminium? (Distillation / Electrolysis / Evaporation / Filtration)
   Answer: Electrolysis