Worksheet 3  In Class Practice

Chapter 1.710
1. How many significant figures are in the following?
a) 4.1 x 10
6
km
______
2
_______
b) 495,000 L
36 (min 3 and max 6)
c) 0.000892 mg ________
3
_______
d) 9.100 x 10
3
dm
3
_____
4
_______
2. Write the following in
scientific notation
:
a) 8120.0 _____
8.1200 x 10
3
_____________
b) 0.000589 _______
5.89 x 10
4
____________
c) 91,030,000 (assume 5 significant figures) ________
9.1030 x 10
7
__________
3. Answer the following with the correct number of
significant figures
:
a) 65.1 + 23.00

18 =
70.1 round to 70. (adding/subtracting use decimal place)
b) 305.895

56.89 + 3.51 =
252.515 round to 252.52
c) 13 รท 16.5 X 0.11 =
0.8666667 round to 0.87 (addition and division use min sig figs)
d) 0.00345 X 5.895 รท 34.129 =
0.000595908 round to 0.000596 or 5.96 x 10
4
4. Convert the following: (Show work.)
a) 15.57 ng to g ____
15.57 ng (
10
9
g
1 ng
) = 1.557 x 10
8
g
__________________________
b) 0.00675 kg to g __
0.0675 kg (
10
3
g
1 kg
)= 6.75 x 10
1
?
_____________________________
c) 8.43 x 10
2
ML to
๏ญ
L __
8.43 x 10
2
ML (
10
6
L
1 ML
)(
? ๐L
10
โ?
๐
) = 8.43 x 10
10
๐L
______________
d) 9.5 x 10
8
dm to km __
9.5 x 10
8
dm(
10
1
m
1 dm
)(
? ??
10
?
?
)= 9.5 x 10
4
??
______________
5. a) DK Metcalf, wide receiver for the Seahawks, ran the 40yard dash in 4.33 seconds.
What is
his speed in miles per hour (mph)? (Show your work) (1 mile= 5280 feet)
(
40. yard
?. ?? ?
)(
? ??
? ๐ฒ๐??
) (
? ????
???? ??
) (
?? ?
? ???
)(
?? ???
? ????
) =
18.889
????
????
=
19
????
????
b) A grizzly bear can run up to 35 mph.
Can DK Metcalf outrun a grizzly
bear?______
NO
________