Chem 208 - Module 2 Notes

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Module 2:

Law of conservation of mass: A law which states that "mass is neither created nor destroyed in chemical reactions". This essentially means that the same number of atoms of each type occurring on the reactant side must also appear on the product side.

Integer: A whole number (i.e., a number that contains no decimal or fractions).

Uncertainty: A characteristic of every measurement, indicating the error in a reported value. This is generally specified using significant figures.

Significant figures: A method for reporting the results of a measurement that includes all known or certain digits and a final digit that is considered uncertain.
SI Units: The International System of units that is based on the metric system and uses SI derived units for length, mass, time, etc. and prefixes to indicate magnitude (i.e., powers of 10).

Density: The physical property of a substance that corresponds to the ratio of its mass to volume. This property does not depend on the amount of substance.

Dimensional Analysis: A method for solving numerical problems that uses 'conversion factors' to cancel out unwanted units and results in an answer with the desired units (i.e., dimensions).

5. If the density of a substance is 4.14 g/cm3, what is the mass in milligrams of a piece of this substance with a volume of 15.46 mL?

6.40 x 104 mg

Object A covered a certain distance in 1.8 x 10-9 s whereas to cover the same distance, object B took 3.6 ns. Which of the following statements is correct?
A is moving at twice the speed of…...

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