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Category: Chemistry
Is the density of a gaseous substance larger or smaller than the density of a liquid or a solid at the same temperature? Why?
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Category: Chemistry
In a multiple-step calculation, is it better to round off the numbers to the correct number of significant figures in each step of the calculation or to round off only the final answer?
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Category: Chemistry
A cold front moves through and the temperature drops by 20 degrees. In which temperature scale would this 20 degree change represent the largest change in temperature?
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Category: Chemistry
To determine the volume of a cube, a student measured one of the dimensions of the cube several times. If the true dimension of the cube is 10.62 cm, give an example of four sets of measurements that would illustrate the following. a. imprecise and inaccurate data Give a possible explanation as to why data can be imprecise or inaccurate. What is wr...
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Category: Chemistry
A measurement is a quantitative observation involving both a number and a unit. What is a qualitative observation? What are the SI units for mass, length, and volume? What is the assumed uncertainty in a number (unless stated otherwise)? The uncertainty of a measurement depends on the precision of the measuring device. Explain.
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