sig-figs and more from chapter 3

Question 1

Convert 89,230,000 to standard exponential notation?

Answer 1

8.923 x 10^7

Decimal point moves 7 places

Question 2

Define dimensional analysis?

Answer 2

A quantitative problem-solving method featuring algebraic cancellation of units and the use of PER expressions.

Question 3

Centi is how much bigger then the basic unit?

Answer 3

10 ^ -2 or 0.01

Question 4

Kilo is how much bigger then the basic unit?

Answer 4

10 ^ 3 or 1000

Question 5

Convert 0.00002349 to standard exponential notation?

Answer 5

2.349 x 10^ -5

decimal point moves 5 places

Question 6

Milli is how much bigger then the basic unit?

Answer 6

10 ^ -3 or 0.001

Question 7

How many significant figures are in

500?

Answer 7

uncertain

Question 8

How many significant figures are in

78,500,082,000?

Answer 8

8 Sig-figs

Question 9

How many significant figures are in

000.00002005

Answer 9

4 Sig-figs

Question 10

How many significant figures are in

0.00052300

Answer 10

5 Sig-figs

Question 11

Round to three significant figures?

65.260 ml

Answer 11

65.3

Question 12

The following is a list of masses of items to be shipped. What is the total mass of the package?
Round off the answer to the first column that has an uncertain digit.
23.98 g , 34.2 g , 25 g

Answer 12

23.98 + 34.2 + 250 =308.18
To round answer to first column that has an uncertain digit we give the same number of decimals as the least found in our measurements.
Answer: 308 or 3.08 x 10^2

Question 13

Volume=length x width x height
If you are given the equation length=25.61 , width=59.0 and height=46. You Must round to the least number of Sig-figs, how many Sig-figs would you round to?

Answer 13

25.61 = 4 Sig-figs
59.0 = 3 Sig-figs
46 = 2 Sig-figs
You would round your answer to 2 Sig-figs