d = m/v (g/cm 3 ) mass usually expressed in grams volume usually expressed in cm 3 or liters, etc

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D = m/v (g/cm 3 ) Mass usually expressed in grams Volume usually expressed in cm 3 or liters, etc.
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Density = amount of matter per unit volume Density is the ratio of mass to volume If the volume stays the same and the mass increases... the density will increase If the mass stays the same and the volume increases... The density will decrease
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M D X V Density = MVMV Volume = MDMD Mass = D x VD x V
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OR
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How close the atoms or molecules are to eachother More than heaviness - density includes how much space an object takes up!! All substances have density including liquids, solids, and gases Density is the measure of the compactness of a material
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When using our calculators we must determine the correct answer; our calculators are mindless drones and dont know the correct answer. There are 2 different types of numbers Exact Measured Exact numbers are infinitely important Measured number = they are measured with a measuring device (name all 4) so these numbers have ERROR. When you use your calculator your answer can only be as accurate as your worst measurementDoohoo Chapter Two 8
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9 An exact number is obtained when you count objects or use a defined relationship. Counting objects are always exact 2 soccer balls 4 pizzas Exact relationships, predefined values, not measured 1 foot = 12 inches 1 meter = 100 cm For instance is 1 foot = 12.000000000001 inches? No 1 ft is EXACTLY 12 inches.
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10 A. Exact numbers are obtained by 1. using a measuring tool 2. counting 3. definition B. Measured numbers are obtained by 1. using a measuring tool 2. counting 3. definition
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11 A. Exact numbers are obtained by 2. counting 3. definition B. Measured numbers are obtained by 1. using a measuring tool
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12 Classify each of the following as an exact or a measured number. 1 yard = 3 feet The diameter of a red blood cell is 6 x 10 -4 cm. There are 6 hats on the shelf. Gold melts at 1064C.
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13 Classify each of the following as an exact (1) or a measured(2) number. This is a defined relationship. A measuring tool is used to determine length. The number of hats is obtained by counting. A measuring tool is required.
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Every experimental measurement has a degree of uncertainty. The volume, V, at right is certain in the 10s place, 10mL

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