CHEM1110 Study Guide 2B - UNIT OF MEASUREMENTS 1 Chemistry...

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UNIT OF MEASUREMENTS
2.When we make a cake we usually follow a recipe and carefully measure each ingredient. Suppose you go to your neighbor and ask to borrow 2 milk. What do you suppose her response will be? “How much milk?”
The units used for these measurements can be almost anything. For example, mass units might be reported in:
A measurement can be reported as accurately using one unit as any other unit.
The unit associated with a number does not describe the magnitude of the number.4.In order to understand how units are handled mathematically, we must first understand exponents. Review Tutorial 2a if you need help.An exponent is a number that is a written as a right-hand superscript next to the base number itmodifies. The exponent denotes how many times the base is multiplied by itself. When a number carries a unit, the unit may also be considered a base raised to some exponent.Consider the following examples which show the use of exponents:52= 5 x 5 = 25mm3= mm x mm x mmUnits are handled mathematically just like a number.Question:a) Express (inch x inch) in multiples of the base unit with an exponent.Question:b) Express (cm x cm x cm) in multiples of the base unit with an exponent.

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