Share Chemistry first term 21
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Two items that must be worn during any laboratory experiment are ___________.
safety goggles and a lab apron
Research that is conducted for the sake of increasing fundamental knowledge is __________.
pure research
Research on solubility as a factor that affects the digestion of foods in humans would be an example of ______________.
Applied research
What is this number in standard notation? 2.70 x 10^-4
0.00027
The sum of 4.824 + 2.03 + 4.72319 + 123.4567 + 111.1 expressed to the proper number of significant figures is ____________.
246.1
The closeness of an experimental value to an accepted value is its ______
Accuracy
What is the percent error if a measured value is 24.59 g/mL and the accepted value is 25.49 g/mL?
3.5%
What is the percent error if a measured value is 24.59 g/mL and the accepted value is 25.49 g/mL?
3
What is the SI unit for temperature?
Kelvin
What is this number expressed in scientific notation? 702.0
7.020 x 10^2
How many significant figures are in the following number? 20.308
5
Is the length a qualitative measurement of a pencil?
No
Solve the following problem with the correct number of significant figures? 5.31 cm + 8.4 cm + 7.932 cm
21.6 cm
A unit that is defined by a combination of base units is a(n) ________________.
Derived unit
What volume is occupied by 16.4 g of mercury? The density of mercury is 13.6 g/mL.
1.21 ml
What is the area in square millimeters of a rectangle that is 7.431 cm long and 23.33 mm wide?
173.4 mm^2
