1.4 Key Math Skills for Chemistry

1.15 What is the place value for the bold digit?
a. 7.3288
b. 16. 1234
c. 4675.99
1.16 What is the place value for the bold digit?
a. 97.5689
b. 375.88
c. 46. 1000
1.17 Evaluate each of the following:
a. 15 – (-8) = _
b. – 8 + (-22) = –
c. 4 X (-2) + 6 = _
1.18 Evaluate each of the following:
a. – II – (-9) = __
b. 34 +(-55)= —
56
c.
8
Use the following graph for problems I 19 and 1.20:
Temperature of Tea versus Time for Cooling
G
L- 60
~
2
‘” ~
c. 50
E
~
40
Time (min)
1.19 a. What does the title indicate about the graph?
b. What is measured on the vertical axis?
c. What is the range of values on the vertical axis?
d. Does the temperature increase or decrease with an increase
in time?
1.20 a. What is measured on the horizontal axis?
b. What is the range of values on the horizontal axis?
c. What is the temperature of the tea after 20 min?
d. How many minutes were needed to reach a temperature
of 45 •c?
1.21 Solve each of the following for a:
a. 4a+4=40
b. ~= 7
6
1.22 Solve each of the following forb:
a. 2b + 7 = b + 10
b. 3b – 4 = 24 – b
Clinical Applicat ions
1.23 a . A clinic had 25 patients on Friday morning. If 21 patient~
were given flu shot~. what percentage of the patients
received flu shots? Express your answer to the ones place.
b. An alloy contains 56 g of pure s ilver and 22 g of pure
copper. What is the percentage of s ilver in the alloy?
Express your answer to the ones place.
c. A collection of coins contains I I nickels, 5 quarters, and
7 dime.~. What is the percentage of dimes in the collection?
Express your answer to the ones place.
1.24 a. At a local hospital, 35 babies were born in May. If 22 were
boys, what percentage of the newborns were boys? Express
your answer to the ones place.
b. An alloy contains 67 g of pure gold and 35 g of pure zinc.
What is the percentage of zinc in the alloy? Express your
answer to the ones place.
c. A collection of coins contains 15 pennies, 14 dimes,
and 6 quarters. What is the percentage of pennies in the
collection? Express your answer to the ones place.
Use the following graph for problems 1.25 and 1.26:
Post-Mortem Body Temperature versus Time
40
36 E
~
2
32
[
E 28
~
24
20
0 5 10 15 20 25
Time (hours) Since Death
1.25 a. What does the title indicate about the graph?
b. What is measured on the vertical axis?
c. What is the range of values on the vertical axis?
d. Does the temperature increase or decrease with an increase
in time?
1.26 a. What is measured on the horizontal ax is?
b. What is the range of values on the horizontal axis?
c. How many hours were needed to reach a temperature
of28 •c?
d. The coroner measured Gloria’s body temperature at9 P.M.
as 34 •c. What was the time of her death?