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# chem303.s1.d10

### cava chem 303 1.12 Problem Solving in Chemistry

Sometimes measurements involve very [...] or very [...] numbers, which the chemist must represent in some convenient shorthand. Sometimes measurements involve very large or very small numbers, which the chemist must represent in some convenient shorthand.
A chemist's measurements WILL have some degree of [...], depending on the precision of his instruments. A chemist's measurements WILL have some degree of uncertainty, depending on the precision of his instruments.
Mercury is an unusual substance. It is a metal, but is liquid at [...] temperature. Mercury is an unusual substance. It is a metal, but is liquid at room temperature.
All sciences, including chemistry, use the Système International d'Unités ([...], or International System of Units), which has the metric system as its basis. All sciences, including chemistry, use the Système International d'Unités (SI, or International System of Units), which has the metric system as its basis.
To convert from one unit to another, you take what you have and multiply it by a [...] factor. To convert from one unit to another, you take what you have and multiply it by a conversion factor.
A conversion factor is a fraction where the top and bottom are [...] to each other, but have different [...] (e.g. 12inches / 1foot) A conversion factor is a fraction where the top and bottom are equal to each other, but have different units (e.g. 12inches / 1foot)
Conversion factors can be written in [...] form (12 inches = 1 foot) or [...] form ( 12 inches / 1 foot; 12 inches PER foot). Conversion factors can be written in equation form (12 inches = 1 foot) or fraction form ( 12 inches / 1 foot; 12 inches PER foot).
It doesn’t matter whether a conversion factor is in equation form or fraction form; the two sides are [...], but with different [...]. This is the key to converting one unit to another. It doesn’t matter whether a conversion factor is in equation form or fraction form; the two sides are equal, but with different units. This is the key to converting one unit to another.
Large and small numbers can be represented by [...] notation; it makes them easier to work with. Large and small numbers can be represented by scientific notation; it makes them easier to work with.
Scientific notation re-writes all numbers as a single number (the coefficient) multiplied by [...] raised to some power. Scientific notation re-writes all numbers as a single number (the coefficient) multiplied by 10 raised to some power.
In scientific notation, the coefficient is always starts with a non-[...] digit, and the decimal always comes after the [...] digit. In scientific notation, the coefficient is always starts with a non-zero digit, and the decimal always comes after the first digit.
6.25 * 10^8 :: move the decimal to the [...] eight places 6.25 * 10^8 :: move the decimal to the right eight places
6.25 * 10^(-8) :: move the decimal to the [...] eight places 6.25 * 10^(-8) :: move the decimal to the left eight places
All measurements are inexact. The level of uncertainty depends on how precise the [...] is that is used to make the measurement. All measurements are inexact. The level of uncertainty depends on how precise the device is that is used to make the measurement.
To express the uncertainties but report the most information about your measurements, you will use what are called [...] figures . To express the uncertainties but report the most information about your measurements, you will use what are called significant figures .
The number of significant figures (sometimes called significant digits) represents the degree of [...] in any measurement. The number of significant figures (sometimes called significant digits) represents the degree of precision in any measurement.
When making a measurement or calculation involving significant figures, the answer can have no more significant figures than the [...] number in any of the quantities used in the calculation. When making a measurement or calculation involving significant figures, the answer can have no more significant figures than the least number in any of the quantities used in the calculation.
Created by: mr.shapard