Significant Figures
How many significant figures are in the number 28.6 g?
What is "3 significant figures"?
This is a proposed explanation that is based on observations and that can be tested.
What is a hypothesis?
The abbreviations for units of length in order from smallest to largest are:
What is mm, cm, m, km?
Written in scientific notation, the measurement 0.000065 cm is
What is "6.5x10-5 cm"?
A large office building is 1.07x102 m long, 31 m wide, and 4.25x102 m high. What is its volume?
What is 1.4x106 m3?
How many significant figures are in the number 0.0067000 kg?
What is "5 significant figures"?
This is described as an explanation of how phenomena occur and how data or events are related.
What is a model?
The unit m3 is used to express
What is volume?
Write the following numbers in ordinary notation:
a. 7.050x103
b. 4.0005x107
c. 2.3500x104
What is:
a. 7050.
b. 40,000,500
c. 23,500.
A student measures the mass and volume of a substance and calculates its density as 1.40 g/mL. The correct, or accepted, value of the density is 1.30 g/mL. What is the percentage error of the student's measurement?
What is 7.7%?
Which of the following measurements are all the zeros considered to be nonsignificant figures:
506 mL
60.0 mL
0.0037 mL
400. mL
What is "0.0037 mL"?
This refers to the closeness of measurements to the correct or accepted value of the quantity measured.
What is "accuracy"?
The relationship between the mass of a material, its volume, and its density is shown in this equation
What is "D=m/v"
What is 6.078 g and 0.3329 g?
What is 6.411 g?
Divide 94.20 g by 3.16722 mL.
What is 29.74 g/mL?
How many significant figures are in the number 0.0144030 km?
What is "six significant figures"?
All of the following are steps in the scientific method except:
Observing and Recording Data
Forming a Hypothesis
Discarding data inconsistent with the hypothesis
Making predictions based on a thoery
What is "discarding data inconsistent with the hypothesis?"
Express a mass of 5.712 grams in milligrams and in kilograms.
What is 5712 mg and 0.005712 kg?
What is "8.57x10-8 m2?
A student calculates the density of iron as 6.80 g/cm3 by using lab data for mass and volume. A handbook reveals that the correct value is 7.86 g/cm3. What is the percentage error?
What is -13.5%?
Suppose the value "seven thousand centimeters" is reported to you. How should the number be expressed if it is intended to contain the following?
a. 1 significant figure
b. 4 significant figures
c. 6 significant figures
What is:
a. 7000 cm
b. 7000. cm
c. 7000.00 cm
List 3 steps of the scientific method
Observation
Collecting Data
Formulating Hypotheses
Testing Hypotheses
Theorizing
List the quantity that goes with the abbreviation as well as what it measures:
m
kg
s
K
mol
What is:
m = meter (length)
kg = kilogram (mass)
s = second (time)
K = kelvin (temperature)
mol = mole (amount of substance)
A sample of a certain material has a mass of 2.03x10-3 g. Calculate the volume of the sample, given that the density is 9.133 x10-1 g/cm3.
What is 2.22x10-3 cm3?
A block of sodium that has the measurements 3.00 cm x 5.00 cm x 5.00 cm has a mass of 75.5 g. Calculate the density of sodium.
What is 1.01 g/cm3?