Vocabulary
Which of these statements about the scientific method is not true?
a. All experiments must follow the same step-by-step procedure.
b. Experiments may be repeated several times.
c. Some unexpected results can be beneficial.
d. Experimental results may or may not support the hypothesis.
a.
What are the prefixes for SI units, in order from greatest to smallest?
Kilo
Hecta
Deca
-- Base
deci
centi
milli
A metal sample has a mass of 45.65 g. The volume of the sample is 16.9 cm3. What is the density of the sample?
2.70 g/cm^3
Which of the following measurements contains three significant figures?
A. 200 mL
B. 0.02 mL
C. 20.2 mL
D. 200.0 mL
c
Express the following quantities in scientific notation:
a. 8 800 000 000 m
b. 0.0015 kg
a. 8.8 X10^9 m
b. 1.5 X10^-3 kg
What is the difference between accuracy and precision?
Accuracy is how close the measurement is to the actual value.
Precision is how repeatable a measurement is.
What are the SI units for:
mass
time
length
gram
second
meter
Convert 1200 dm^3 to m^3
1.2 m^3
How many significant figures do the following numbers have?
a. 665.000
b. 605
c. 12,000
a. 6
b. 3
c. 2
Carry out the following calculations. Express the results in scientific notation and with the correct number of significant figures.
(3.01 X 10^22 atoms) + (1.19 X 10^23 atoms) + (9.80 X 10^21 atoms)
1.59 X 10^23 atoms
What is density?
mass / volume
Which of the following masses is the largest?
A. 0.200 g
B. 0.020 kg
C. 20.0 mg
D. 200 mg
b.
Convert the following to the required units.
3.72 L/h to cubic centimeters per minute
62 cm^3/min
Round the following quantities to the specified number of significant figures:
a. 5 487 129 m to three significant figures
b. 0.013 479 265 mL to six significant figures
c. 31 947.972 cm^2 to three significant figures
a. 5 490 000 m
b. 0.013 479 3 mL
c. 31 900 cm^2
Carry out the following calculations. Express the results in scientific notation and with the correct number of significant figures.
(3.03 X 10^4 cm^2) X (6.29 X 10^2 cm)
1.91 X 10^7 cm^3
A theory differs from a hypothesis in that a theory
A. cannot be disproved.
B. always leads to the formation of a law.
C. has been subjected to experimental testing.
D. represents an educated guess.
c
A measurement of 23 465 mg converted to grams equals:
23.465 g
A textbook measures 250.0 mm long, 224 mm wide, and 50.0 mm thick. It has a mass of 2.94 kg.
What is the density of the book in grams per cubic centimeter?
1.05 g/cm^3
Calculate the following with the correct significant figures and units:
(33.00 cm^2) X (2.70 cm)
89.1 cm^3
Carry out the following calculations. Express the results in scientific notation and with the correct number of significant figures.
(3.803 X 10^3 g) / (5.3 X 10^6 mL)
7.2 X 10^-4 g/mL
(Do you recognize this as a density measurement?)
Define derived unit and give one example.
A derived unit is comprised of simpler units of measure.
Velocity --> m / s
Density --> kg / m^3
Area -->. m^2
Volume -->. m^3
Fill in the blanks:
1 L = ______ mL = ________ cm^3
1000 / 1000
Express the following in liters and milliliters:
582 cm^3
0.582 L; 582 mL
Calculate the following with the correct significant figures and units:
3200 mg + 325 mg - 688 mg
2800 mg
A single atom of platinum has a mass of 3.25 x 10^-22 g.
What is the mass of 6.0 X 10^23 platinum atoms?
(You need to multiply the two numbers to find the answer. Ensure you have the correct Sig Fig and UNITS!)
2.0 X 10^2 g