Download Significant Figures

Check Test #1
Questions on Significant Figures
If your instructor requires you to do so, “TYPE”
or “PRINT” each of the following questions.
If you PRINT, you must use a Number # 2 Pencil.
You must first write the Question and then
“Show Your Work” for each part under each
question and then move to the next part.
If it is a mathematical problem, you must
show the equation, substitute and then work it
out showing every needed step.
You “CANNOT” do any work in your head.
This means you must show every step with its
needed step.
I. Questions On Significant Figures:
1. Which term means that two or more measurements have values that are
very close to each other?
2. Why do we use significant figures?
3. When are zeros in numbers not significant?
4. What kind of numbers have an infinite number of significant figures?
5. What kind of physical measurements can be measured with absolute
accuracy?
6. When can several measurements show a high degree of precision, but
have poor accuracy?
7. What are some of the causes that produce uncertainty in measurements?
8. What term means that a value is very close to the true value?
9. a) What does 16 +/- 1 mL mean?
b) 16.1 +/- 0.1 mL mean?
I. Questions On Significant Figures:
10. Which numbers are uncertain in (a) 46 mL (b) 96.0 mL (c) 4.8 x 10-3
mL?
11. Give two different kinds of numbers that have an unlimited number of
significant figures.
12. What determines how many significant figures can appear in an answer
that is obtained from using several measured values in a calculation?
13.
a. What is the last significant figure number?
b. Significant figure rounding number?
14. When adding measurements that have different numbers of significant
figures, what rule is used for finding the number of significant figures in
the final answer?
II. Give the number of significant
figures found in each of the following
1. 0.3
2. 1.23 x 10
3. 64.170 - 4
4. 7000
5. 74.06
6. 5.60 x 10 2
III. Round-off the following number so they
will each have three significant figures
1. 632.66
2. 190.6
3. 6.3648
4. 1.00543
5. 0.01985
6. 7.7764 x 10²
IV. Do the following calculations and then round-off the
answer to the correct number of significant
figures
1.
56.4 = ?
10.0
2.
5140.0
0.02200
=?
3.  25064 cc   1 mL   1 liter 
1

  1 cc   1000 mL 
= ? liters
*Definitions: 1 liter = 1000 mL and 1 mL = 1 cc
 40.5 ml   0.650 gram 

 = ? grams
4. 
1
1.00
mL



IV. Do the following calculations and then round-off the
answer to the correct number of significant
figures
5.  45 gallons   4 qt   1.00 liter   1000 ml   0.801 g   1.00 pound 
1
1.06 qt  1 liter   1.00 mL 
454 g

 1 gal





*4 quarts = 1 gallon and 1000 mL = 1 liter are both definitions.
The 1.00 liter = 1.06 quart; 0.801 gram = 1.00 mL and 1.00
pound = 454 grams each has only 3 significant figures
6.
7.
180.0 grams
2.60 grams
=?
Volume of a solid = length x width x height
Volume = (3.00 cm) (0.700 cm) (1.20 cm)
Volume = ? cubic centimeters
IV. Do the following calculations and then round-off the
answer to the correct number of significant
figures
8.
 20.0 mg   1.00 mL 
 = ?mL

 
1
15.0
mg



 200.0 mL   1.00 minute 


9. 
1
  5.00 mL  = ? minutes
10.
Add 164.67 cm ; 46.1 cm ; and 0.986 cm
11.
Subtract 17.6 grams from 96.48 grams
12.
 2.00 days   24 hours

 
1

  1 day
  60 minutes   60 seconds 
 

 = ? seconds
  1 hour   1 minute 
All the above given values are definitions except the 2.00 days!