Task 1 Question and Answers

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  • Created by: qwerty123
  • Created on: 01-03-16 21:08
The results collected from this investigation should be accurate. Explain what is meant by accurate results.
Accurate results should be near to the true value and have few errors in making measurements.
1 of 10
Explain the link between a very small mean value and inaccurate results.
Problem of measuring small values accurately as there will be time delays in operating a stops watch. The error will be a greater proportion of a small value.
2 of 10
Describe and explain the relationship between standard deviation and the reliability of results.
The greater the standard deviation the less reliable the results are as the greater the spread around the mean. overlap of standard deviation indicates the means may not be significantly different.
3 of 10
Explain why it is important to take several measurements.
Repeat measurments makes the mean more reliable and also allows anomalies to be identifed and minimises the effects of them. Also to get concordant results.
4 of 10
How would using a larger syringe affect the accuracy of your results?
IT may be more accurate as there is a smaller percentage error and less effect from stopping and starting the timer.
5 of 10
how would using a digital timer to 0.00001 seconds affect the accuracy of your results?
There may be little or no difference because stopping and starting the timer still has a big effect.
6 of 10
Why may data for the last three tubes of an experiment be more reliable than the first three?
You have practice in seeing, so are able to watch the gas syringe more carefully.
7 of 10
What are the limitations of measuring gases?
Gas syringes at a fast rate of reaction are moving and the exact position can be difficult to determine.
8 of 10
What are the limitations of determining colour change?
Colour is subjective and introduces human error. This can be improved by having a standard to compare.
9 of 10
What are the limitations of measuring time?
There are errors in reaction time when stopping and starting a stopwatch. Errors are also more significant with shorter times.
10 of 10

Other cards in this set

Card 2

Front

Explain the link between a very small mean value and inaccurate results.

Back

Problem of measuring small values accurately as there will be time delays in operating a stops watch. The error will be a greater proportion of a small value.

Card 3

Front

Describe and explain the relationship between standard deviation and the reliability of results.

Back

Preview of the front of card 3

Card 4

Front

Explain why it is important to take several measurements.

Back

Preview of the front of card 4

Card 5

Front

How would using a larger syringe affect the accuracy of your results?

Back

Preview of the front of card 5
View more cards

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