Download Unit 7 Measurement review

Semester Review Measurement
Name_____________________
DIRECTIONS: Answer the questions that follow.
1.
Determine the
a. _____
c. _____
e. _____
number of sig figs in the numbers below.
0.00100 m
b. _____ 2.0800 X 102 L
480 cars
d. _____ 0.000304 g
0.7050 g
f. _____ 3. mL
d. Determine if the underlined number has a finite (limited) number of sig figs or an
infinite number of sig figs. If it has a finite number of sig figs, write F on the line;
if it has an infinite number of sig figs write I on the line.
a. _____ There are 24.5 mL of liquid in this graduated cylinder.
b. _____ There are 1000 m in 1 kilometer.
c. _____ There are 24 people in this room.
d. _____ 2.54 cm = 1 in
e. _____ I weigh 185 pounds.
2.
Fill in the chart below.
a. 12.6 m X 0.53 m
b. 25.36 mL – 4.15 mL
c. 212.2 kg + 26.09 kg
d. _
3.00 g
_
(2. cm X 3.1 cm X 2.00 cm)
Answer without
Answer with
sig figs
sig figs
__________
__________
__________
__________
__________
__________
Units
__________
__________
__________
3. Correctly read the ruler below.
4. Fill in this chart. Be careful about capital and lower case letters.
prefix
mega
kilo
deci
centi
milli
micro
nano
symbol
ordinary notation
Scientific notation
__________
__________
__________
5. Three groups determined the density of the same piece of aluminum three times. Their data is
below. The true value is 2.70 g/mL
Group A
Group B
Group C
Trial 1
2.65 g/mL
2.80 g/mL
2.71 g/mL
Trial 2
2.65 g/mL
2.60 g/mL
2.70 g/mL
Trial 3
2.65 g/mL
2.70 g/mL
2.69 g/mL
Average
2.65 g/mL
2.70 g/mL
2.70 g/mL
a. Which group(s) is/are most precise? Explain
b. Which group (s) is/are most accurate? Explain.
c. Which group (s) is/are both precise and accurate? Explain
6. For Group A in the previous question, determine the percent error. Show all work. Use units and
sig figs.
7. Use dimensional analysis to answer these questions. Be sure to show all work; use units; use sig
figs.
a. You have 26.4 grams of ammonia (NH3). (i) How many moles of ammonia is this? (ii) How many
molecules of ammonia is this? (iii) How many atoms of hydrogen are in 26.4 grams of ammonia?
b. You have 9.03 X 1023 molecules of water. (i) How many oxygen atoms are in this amount of
water? (ii) How many hydrogen atoms are in this amount of water? (iii) What is the total number
of atoms in this amount of water? (iv) How many moles of water is this? (v) How many grams of
water is this?
8. What is the standard used to define the mole?
9. Fill in the chart below. Show all work; use units; use sig figs as you work out the questions.
Substance
mass
volume
density
1
(i)
15.0 mL
10.5 g/mL
2
40.0 g
(ii)
7.87 g/cm3
3
2.98 kg
125 mL
(iii)*
*Express the answer to (iii) in g/mL.