Chemistry- Metals and acids- Year 8

Question 1

1. Zinc + hydrochloric acid = salt + ?
2. What do all acid compounds have?
3. What happens when hydrogen is replaced by a metal?

Answer 1

1. Metal + acid = salt + HYDROGEN GAS]
2. Acid compounds have hydrogen in them
3. Hydrogen < by metal = compound ( salt )

Question 2

1. What are the 3 main acids?
2. Can metals react with these acids?
3. copper + hydrochloric acid ➞ copper ? + hydrogen

Answer 2

1. hydrochloric acid, sulfuric acid and nitric acid
2. Metals CAN react with all of these acids to produce a salt and hydrogen gas
3. copper + hydrochloric acid ➞ copper CHLORIDE + hydrogen

Question 3

1. How do you test for hydrogen?
2. What happens when very reactive metals ( eg soduim) react with cold water
3. sodium + water ➞ sodium hydroxide + ?

Answer 3

1. Insert a lit splint into the upturned test tube – if the gas is hydrogen, there will be a ‘pop’ sound.
2. produce a metal hydroxide and hydrogen gas
3. Hydrogen

Question 4

1. Magnesium + steam = ?
2. When does a displacement reaction occur?
3. ( continuing from question 2) Which element will take place in a compound- more reactive or less reactive

Answer 4

1. Magnesium oxide and hydrogen
2. When a more reactive element takes the place of a less reactive element in a compound
3. More reactive

Question 5

Which is more reactive?

1. potassium or sodium
2. Zinc or Lithium
3. Calcium or Gold
4. Copper or lead

Answer 5

1. Potassium
2. Lithium
3. Calcium
4. lead

Question 6

1. What do symbol equations always have after a substance
2. What are state symbols
3. Metal + ? = Metal oxide

Answer 6

1. letters inside brackets
2. letters which the state of matter of each substance (eg (s) = solid, (l) = liquid, (g) = gas, (aq) = dissolved in water)
3. Oxygen

Question 7

List of how metals react with oxygen

Answer 7

magnesium burns vigorously
zinc burns less vigorously
iron burns
lead do not burn; when heated, form layer
copper of oxide on surface
gold no reaction

Question 8

Most reactive to least reactive

Answer 8

most reactive
potassium
sodium
lithium
calcium
magnesium
aluminium
zinc
iron
lead
copper
silver
gold
least reactive