UNIT 3. Lab Reports and Evaluating Results

Question 1

Who first discovered atom?

Answer 1

Greek philosopher DEMOCRITUS.

Question 2

Who adopted Democritus’s idea of the atom?

Answer 2

John Dalton

Question 3

John Dalton formed…

Answer 3

First modern atomic model.

Question 4

Steps to writing lab report:

Answer 4

1) Title
2) Introduction/ Purpose
3) Hypothesis-prediction
4) Materials and equipments
5) Procedure
6) Data/ Results
7) Conclusion/ Evaluation

Question 5

Results can be:

Answer 5

Conclusive and inconclusive.

Question 6

If results don’t lead to a definite answer they are…

Answer 6

inconclusive.

Question 7

In case of inconclusive results:

Answer 7

• Change variables
• Design a new model
• Try a different investigation.

Question 8

Two types of errors:

Answer 8

1) Systematic
2) Random

Question 9

Systematic VS Random. What is the difference?

Answer 9

Systematic error affects the accuracy of a measurement, while random error affects precision of the measurements.

Question 10

Calibration is…

Answer 10

when the readings of an instrument are compared to a known measurement to check its accuracy.

Question 11

Calibration is also known as…

Answer 11

zeroing.

Question 12

Parallax error is…

Answer 12

an error that occurs when you view the object from different points.