Metal Carbonate Controlled Assessment
Controlled Assessment Task:
State the hypothesis you will be testing in your investigation:
The speed of a metal carbonate breaking down depends on where the metal is in the reactivity series. The more reactive a metal is the slower it takes for it to breakdown. The less reactive a metal is it breaks down faster.
Explain the hypothesis using scientific ideas:
The metal carbonate which is lower in the reactivity series such as copper can thermally decompose much faster because it is the least reactive metal so its an unstable carbonate and the bonds are much weaker. So the metal that is much higher in the reactivity series such as calcium, is more thermally stable and hard to decompose also the more reactive the metal is it forms …show more content…
Four carbonates altogether so 16 boiling tubes.
• Heat proof mat- For the bunsen burner to be placed on top of it to avoid accidents
• Two clamps- One clamp to hold the metal carbonate and one to hold the limewater.
• Scale- To equally measure all the carbonates you heat.
• Stop watch: To check the time it took for the metal carbonate to turn the limewater milky.
• Measuring cylinder: To know how much limewater needed to put into the boiling tube.
• Rubber bung- So it can go inside the boiling tube with the carbonate in.
• Delivery tube: So the Co2 is collected in the limewater.
• Eye protection- To protect the eyes from spills.
• Splinter- To light the bunsen burner.
Controls:
• I will have the same mass of the different types of metal carbonates. To control this I will weigh the carbonates and make sure its the same mass for each time when we heat it.
• I will be changing the metal carbonates and I will control this by making sure I have weighed the same mass of metal …show more content…
Ensure that the metal carbonate is slanted side ways and about the bunsen burner. Measure with a ruler the distance it should be 15cm.
6) With another clamp , screw on another boiling tube.
7) Fill the tube with limewater
8) The delivery tube then should go into the limewater
9) Mark a X on the boiling tube filled with limewater
10) Make sure that the stop watch is ready and working and on 0 seconds.
11) Get a light splint and light the bunsen burner.
12) When bunsen burner is lit that it when the stopwatch it turned on.
13) When limewater is turned milky enough that you cannot see the X stop the stopwatch. If limewater has not turned milky by two minutes stop the timer.
14) Before turning the bunsen burner of make sure you take out the delivery tube from the limewater to avoid suck back.
15) Then turn of the bunsen burner
16) Note down on results table the time it took for the limewater to turn milky.
17) Repeat the experiment with the other metal carbonates.
Secondary evidence - comment on the quality of this secondary
State the hypothesis you will be testing in your investigation:
The speed of a metal carbonate breaking down depends on where the metal is in the reactivity series. The more reactive a metal is the slower it takes for it to breakdown. The less reactive a metal is it breaks down faster.
Explain the hypothesis using scientific ideas:
The metal carbonate which is lower in the reactivity series such as copper can thermally decompose much faster because it is the least reactive metal so its an unstable carbonate and the bonds are much weaker. So the metal that is much higher in the reactivity series such as calcium, is more thermally stable and hard to decompose also the more reactive the metal is it forms …show more content…
Four carbonates altogether so 16 boiling tubes.
• Heat proof mat- For the bunsen burner to be placed on top of it to avoid accidents
• Two clamps- One clamp to hold the metal carbonate and one to hold the limewater.
• Scale- To equally measure all the carbonates you heat.
• Stop watch: To check the time it took for the metal carbonate to turn the limewater milky.
• Measuring cylinder: To know how much limewater needed to put into the boiling tube.
• Rubber bung- So it can go inside the boiling tube with the carbonate in.
• Delivery tube: So the Co2 is collected in the limewater.
• Eye protection- To protect the eyes from spills.
• Splinter- To light the bunsen burner.
Controls:
• I will have the same mass of the different types of metal carbonates. To control this I will weigh the carbonates and make sure its the same mass for each time when we heat it.
• I will be changing the metal carbonates and I will control this by making sure I have weighed the same mass of metal …show more content…
Ensure that the metal carbonate is slanted side ways and about the bunsen burner. Measure with a ruler the distance it should be 15cm.
6) With another clamp , screw on another boiling tube.
7) Fill the tube with limewater
8) The delivery tube then should go into the limewater
9) Mark a X on the boiling tube filled with limewater
10) Make sure that the stop watch is ready and working and on 0 seconds.
11) Get a light splint and light the bunsen burner.
12) When bunsen burner is lit that it when the stopwatch it turned on.
13) When limewater is turned milky enough that you cannot see the X stop the stopwatch. If limewater has not turned milky by two minutes stop the timer.
14) Before turning the bunsen burner of make sure you take out the delivery tube from the limewater to avoid suck back.
15) Then turn of the bunsen burner
16) Note down on results table the time it took for the limewater to turn milky.
17) Repeat the experiment with the other metal carbonates.
Secondary evidence - comment on the quality of this secondary