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The act of comparing an unknown quantity to a standard unit is known as __________
Measurement
There are____________ fundamental units in the SI
Seven
The SI unit that represents the number of particles in a substance is the ___________
Mole
A chemist wants to measure the mass of a lump of coal. What SI base unit will he use?
Kilogram
Units of measurement that are combination of SI units are called _______________ units
Derived
Which SI units is used when measuring the volume of a substance?
Cubic meter
The square meter (m2) is a derived SI unit for ____________
Area
What prefix means "millionth"?
Micro-
The human eye can detect wavelengths of light as short as 0.000 037 cm. What is this wavelength in
nanometers?
370nm
What does 25 500 g equal in kilograms?
25.5
A measurement or instrument that reflects a numerical evaluation of how close a measured value is to the expected or accepted value of the dimension being measured is known as _____________
Accuracy
You measure the products of a chemical reaction three times and obtain 6.15 g, 6.16g, copying, and 6.13g. The actual mass is 6.14g. Your measurements are______________
Both accurate and precise
You measure products of a chemical reaction three times and get 4.12g, 3.25g , and 4.79g . The actual mass is 2.25g. Your measurements are_________
Neither accurate, nor precise
To calculate the percent error, we must take the ________ value minus the accepted value, divided by the___________ value, and multiplied by 100%.
Observed; accepted
The smaller the percent error of a measurement, the more ____________ the measurement.
Accurate
You measure the mass of a product in a chemical reaction to being 1.87g. Theoretical Calculations, predict that you should have obtained 1.95g. Using the correct number of significant figures, to calculate the percent error.
4.10%
An evaluation of the exactness of a measurement or a measuring instrument indicates its ___________
Precision
When using an analog metric instrument, we should estimate the measurement to the nearest ___________ of the smallest decimal subdivision on the instrument's scale.
Tenth
Which factors affect precision in measurements?
mathematical error, improper calibration, and procedural error
The precision of a measurement is indicated by using __________
Significant figures
Using scientific notation, convert 463 kg to milligrams.
4.63 × 108 mg
Using scientific notation, convert 342 mm to decimeters
3.42 dm
Significant figures apply only to ________ data
Measured
What indicates the precision of an instrument and helps scientists report measurements honestly?
Significant figures
The measurement 0.005 006 10 m has how many significant figures?
6