Practical Techniques

Question 1

How would you convert between m^3 and dm^3?

Answer 1

1m^ = 1000dm^3

Question 2

How would you convert between dm^3 and cm^3?

Answer 2

1dm^3 = 1000cm^3

Question 3

What must you do if you are looking for a colour change in an experiment?

Answer 3

Put a white back ground behind the reaction container

Question 4

What must you do if you are looking for a precipitate to form?

Answer 4

Mark an X on the piece of paper and place it under the reaction container. Your solution is cloudy when you can no longer see the X

Question 5

When measuring temperature on a thermometer what must you do to make sure your reading is accurate?

Answer 5

1) Wait for the temperature to stabilise before taking an initial reading
2) Read thermometer at eye level

Question 6

What are valid results?

Answer 6

Those that answer the original question. For example you have controlled all your variables.

Question 7

What are accurate results?

Answer 7

They are really close to the true answer.

Question 8

What are precise results?

Answer 8

They can be reproduced in an experiment.

Question 9

How could an experiment be improved?

Answer 9

• Make sure you control all variables
• Was apparatus an appropriate scale for measurements
• Use more accurate equipment
• Repeat experiment