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Scientific Measurement

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All measurements have a number value AND a unit.

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Remember place values!

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Significant figures are all the measurement numbers you can read from the markings on a measuring tool plus one guess.

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The more numbers you can write for a measurement, the more precise the tool is.

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This ruler shows does not show consecutive markings for the tenths. Our guess digit will be the tenths place.

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How long is the pencil?

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This is a beaker. It is not very precise.

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How many mL of liquid are in the beaker? Hint: Where is the 10mL mark?

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How many mL of solution are in this beaker?

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This is an Erlenmeyer flask. It is not very precise.

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What place value would your guess digit have?

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This is tricky! How many mL are in the flask?

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This is a graduated cylinder. It is more precise than an Erlenmeyer flask or a beaker.

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Water-based solutions will form a meniscus in a graduated cylinder.

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To read a volume you must be “eyeball to eyeball” with the meniscus.

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Read the volume from the BOTTOM of the meniscus.

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Read the volume in the graduated cylinder (mL).

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How many mL are in this graduated cylinder?

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This is a buret.

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A buret is more precise than a beaker or graduated cylinder.

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A buret has a meniscus.

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The marks on a buret start with zero at the top. You read how much liquid left the buret.

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Read the volume (mL) on the buret.

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