Dimensional Analysis
What is the expression of a ratio of equal quantities with different units in the numerator and denominator?
conversion factor
What are the meaningful number of digits in a recorded result called?
significant figures (or digits)
What type of substance cannot be separated into simpler substances by chemical means?
element
Physical state, melting point, boiling point, and density are all examples of ________ properties.
physical
What is the correct conversion factor when converting millimeters to feet? (1 foot = 305 mm)
1 foot/305 mm
What is/are the number of significant figures in the recorded result of 50.0?
3
What is a homogeneous mixture of substances?
solution
Properties that depend on the amount of matter and can be added together are called ________ properties.
extensive
What term is used to describe the flow-chart for setting up a dimensional analysis calculation?
road map
What defines the magnitude of scatter in repeated measurements?
precision
Round 12.80927 to six significant figures.
12.8093
Provide one example of an intensive property of matter.
color or density or concentration or observed physical property
How many minutes does it take light from the sun to reach the earth. (The distance of earth to the sun is 93 million miles; the speed of light is 3e8 m/s; 1 mile = 1,609 meters.)
500 seconds
What is the name given to the last digit in a recorded result?
(first) uncertain digit
Express 500,000 in exponential notation with 3 significant figures.
5.00e5
In the scientific method when the hypothesis is rejected from the analysis of experimental results, what is the next step?
refine hypothesis and perform further experiments
How many milliseconds are equal to six months? (1 hr = 60 min; 30.4167 d = 1 mo; 1 d = 24 hr;1 min = 60 s; answer to 2 sig figs)
1.6e10 ms
What is an exact number?
number with no associated error or numbers obtained by counting
What are the allowed values of A in the expression A x 10n?
integers from 1 to 9
A concise verbal or mathematical statement of a reliable relationship between phenomena derived from repeated observations is a _____.
law
What is the equivalent of 1.0e20 nm3 in m3?
1.0e-7 m3
Express the result with the correct number of significant figures in the calculation below?
129.41 - 15.223355
114.19
Name the three states of matter.
solid, liquid and gas (or vapor)
If the density of corn syrup is 1.380 g/mL and a sample of 32 grams of syrup is removed, what is the volume, in liters?
0.023 L