Chapter 3

Question 1

how many sig figs should the answer have:
10.55 + 156.6 + 4.56783

Answer 1

4

Question 2

how many sig figs should the answer have:
34.81 x 8.1/127.9

Answer 2

2

Question 3

How many sig figs should the answer have:
1.20x10^-5

Answer 3

3 numbers after the decimal

Question 4

10^-3.12

Answer 4

2 because there are 2 numbers after the decimal

Question 5

systematic error(determinate error)

Answer 5

• error that we should be able to get rid of supposedly
• due to flaw in experiment or measuring device
• will shift results either higher or lower

Question 6

random(indeterminate error)

Answer 6

• from uncontrollable variables in the experiment
• can be reduced using better tools, but cannot be erased
  ex: not getting all solid out of the weigh boat

Question 7

blunder

Answer 7

• gross error(operator error)
• something YOU did and know is wrong
• nothing to do w/ equipment its all you!!

Question 8

of the three types off error which can we theoretically remove from our experiments

Answer 8

systematic and blunder

Question 9

how many pico meters are in 1 cm

Answer 9

10^-12

Question 10

A student analyzes the iron in an ore and finds the following iron percentages: 21.35, 21.36,
and 21.33. The correct percentage is 20.21. The results obtained by the student are said to
be

Answer 10

precise but not accurate

Question 11

An analysis of a sample is run three times and the results agree closely with each other. One
can conclude that

Answer 11

random errors have been minimized