Transcript Chapter 2 Review Answers

Margaret buys a gold coin form the Franklin Mint
that is certified to weigh 15.6 g. When she puts it on
a balance in the lab, it displays 14.1g. What is the
percent error in Margaret’s measurement?
15.6 − 14.1
× 100 = 9.6%
15.6
Round the following numbers to the number
of significant figures indicated in parentheses.
0.002876 (2)=
598 (2)=
102670 (3)=
6.75 x 10-3 (1)=
0.0029
6.0x102
103000
7x10-3
Divide the following numbers and report your
answers to the correct number of significant figures
in scientific notation.
a.
b.
(4.0x10-6)/(8.0x10-3) = 0.5x10-3
15.0/3.0 = 5.0
5.0x10-4
Subtract the following numbers and report
your answers to the correct number of
sig figs:
a. 1825-70 = 1755
1860
b. 5.0x106-2x105= 4.8 x 106
5x106
Add the following numbers and report the
answers to the correct number of sig figs.
19060 + 285=19345
19350
1.2x108 + 5.4x107=1.74x108
1.7 x 108
Match the measurements with the correct SI unit:
1. Length F 2. Mass B 3. Temperature H 4. Time D
A.
B.
C.
D.
E.
Liter
Kilogram
Celcius
Second
Kilometer
F. Meter
G. Cubic Centimeter
H. Kelvin
I. Millisecond
J. Gram
Convert 3820dg to ounces using the following
conversion factors and the factor label method
of analysis.
2.2lbs=1kg, 1000g=1kg, 10dg=1g, 16oz=1lb
****Remember Sig Figs****
3820𝑑𝑔
1𝑔
10𝑑𝑔
1𝑘𝑔
1000𝑔
2.2𝑙𝑏
1𝑘𝑔
160𝑧
1𝑙𝑏
= 13.4464
13.4𝑜𝑧
How many significant digits are in the following
numbers?
10200040
0.00654040
125.0000
1330.0650
0.010001
7
6
7
8
5
What is the density of the following substance?
change in y over the change in x =
10𝑔
14𝑚𝑙
= 0.71g/ml
Is the following substance:
a. Rubidium=1.532g/ml b. Potassium = 0.71g/ml c. Beryllium=1.85g/ml
What is the value of 34oC in Kelvin?
K=C+273
K=34+273=307K
Multiply the following numbers and report the
answers in scientific notation to the correct
number of sig figs.
(4.2x106)(3x10-3) = 12.6 x 109
81 x 9.00= 729
730
1.26 x 1010
What happens to the density of an object when
volume decreases?
(such as what happens to a balloon on a cold day)
Density Increases
Write the following numbers in correct
scientific notation form.
0.006420
3050728
101.28 x 102
6.420x10-3
3.050728x 106
1.0128x104
Determine the density of this object and
report your answer to the correct number of
sig figs.
60
50
𝐷=
𝑀
𝑉
4.6𝑔
56.0−52.6
= 1.3𝑔/𝑚𝐿
Calculate the volume of this object in cm3 and
then convert to mm3
(report your answers to the correct number of sig figs)
I don’t remember the exact
measurements, but….
V= L x W x H so…
6.42𝑐𝑚 × 2.85𝑐𝑚 × 4.30𝑐𝑚 = 78.6771 𝑐𝑚3
10𝑚𝑚 3
3
3
78.7𝑐𝑚
=78700mm
1𝑐𝑚
78.7cm3
Rewrite the following equation to solve for
mass and then for volume. (2 equations)
Which of the following are derived
measurements?
a. Mass
b. Length
c. Volume
d. Time
e. Temperature
f. Density
Match the equivalent values:
1.
2.
3.
4.
1 kg
1 dag
1 hg
1 mg
a. 0.1 kg
b. 10000mg
c. 0.0001 dag
d. 10 hg
Do the following multidimensional conversion
using the factor label method.
Convert 0.63lbs/qt→cg/mL
(2.2lbs=1kg, 1.1qt=1L)
****Remember Sig Figs****
0.63
𝑙𝑏𝑠 1𝑘𝑔
𝑞𝑡 2.2𝑙𝑏𝑠
1000𝑔
1𝑘𝑔
100𝑐𝑔
1𝑔
1.1𝑞𝑡
1𝐿
1𝐿
𝑐𝑔
= 31.5 → 32
1000𝑚𝐿
𝑚𝐿
How would you describe this archer’s skill in
terms of accuracy and precision?
Precise, but not accurate