Science & Inquiry
What type of observation involves numerical measurements?
Quantitative
What is the standard SI base unit for Temperature?
Kelvin
Express the number 8,002,000 Hz in scientific notation.
8.002 x 10^6 Hz
What is the rule for determining significant figures when adding or subtracting measurements?
round to the least number of decimal places
Define Precision versus Accuracy using the dartboard analogy.
Precision - all dart shots close together
Accuracy - all shots are close to the center of the target
What is an inference?
An explanation of what causes observations
What are the SI base units for Mass, Time, and Length?
Mass - Kilogram
Time - Second
Length - Meter
Convert 8.27 x10^-2 cd into standard decimal form.
0.0827 cd
What is the rule for determining significant figures when multiplying or dividing measurements?
round to the least number of sig figs
Convert 42.5 cm into meters m.
0.425 m
What are the two main branches that make up Physical Science, and what does each study?
Chemistry - the composition, structure, and reactions of matter
Physics - the study of matter and energy and how they interact through forces and motion
Arrange these metric prefixes in order from largest to smallest: milli, kilo, centi, hecto, deca, deci.
kilo -> hecto -> deca -> deci -> centi -> milli
How many significant figures are in the measurement 0.02?
1
Round 45,382 to 3 significant figures.
45,400
When using a t-chart for unit conversions, where must you place the unit you want to eliminate/cancel out?
on the bottom
(or opposite the unit you want to cancel!)
Explain the difference between the Independent Variable and the Dependent Variable.
Independent variable - deliberately changed
Dependent variable - changes in response to the independent variable
How many meters are equivalent to 1 kilometer?
1000
Compare 5,000 and 5,000.. How many sig figs does each have and why?
5,000 has 1 because there is no decimal.
5,000. has 4 because of the decimal.
Solve and round to the correct number of decimal places:
222 mL
Convert 2.4 days into minutes.
3500 minutes
Explain the main difference between a Scientific Theory and a Scientific Law.
Scientific Theory - a well-tested explanation for a set of observations
Scientific Law - a statement that describes a pattern in nature without explaining why it happens
What numerical value is represented by the prefix milli (m)?
0.001
Convert 0.00049 kg to scientific notation AND tell how many sig figs it contains.
4.9 x 10^-4 kg
2 sig figs
Solve and round to the correct number of significant figures:
13 m^2
Convert a speed of 15.0 meters per second into kilometers per hour.
54 km/hr