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10 Cards in this Set
- Front
- Back
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The correct value for the length of a metal rod is 28.6cm. Give examples of measurements which would be accurate but not precise. What is the difference between precision and accuracy? |
Accuracy is a measure of how close the value is to an accepted value. Precision is a measure of how close a series of measurements are to one another, irrespective of the actual value. For a measurement to be accurate but not precise, it must be close to, or the same as, the accepted value. For it to to not be precise but accurate, it can only be one value. So the answer would be 28.6cm. What would be an example of measurements that were precise but not accurate? |
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The ____ of an object changes with its location on Earth. |
weight |
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According to the rules of significant figures, what is the number of digits that are estimated in a measurement? |
One. When measuring, the last digit is estimated. |
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What is the correct answer including significant digits for the following: 12.9 + 2.38 + 5.123 = |
20.403 In addition and subtraction, the place value of least significant determines the number needed in the answer unless the value is a defined or exact value. |
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SI Units: a. Mass b. Volume c. Temperature d. Time e. Length |
a. kilogram b. liter c. Kelvin (°C+273=K) d. seconds e. meters |
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What is the difference between weight and mass? How is your mass and weight different on the moon? |
Weight is the force that measures the pull on a given mass by gravity. Mass is a measure of the quantity of matter. Weight can change with changing gravity. Mass does not change. Your mass does not change when you are on the moon. However, because the gravity of the moon is 1/6 of the gravity on Earth, your weight will be 1/6 on the moon. |
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What is density? What is the equation for density? Be able to use it to solve for all three variables. (Remember to use the steps to solving a problem used in class: GUESS) What happens to density if the temperature of a substance increases? |
Density is the ratio of the mass of an object to its volume. D=MV. M=VD. V=M/D. GUESS is Given, Unknown, Equation, Set-up, and Solve. As the temperature of a substance increases, its volume increases. Density will decrease because you will be dividing the unchanging mass by a larger number. |
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Given a number, be able to determine the significant digits. Also be able to compute simple math problems writing the answer with the correct significant digits. |
~ |
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If the accepted density of gold is 19.3 g/mL and the chunk of gold that we have has a density of 18.2 g/mL, is it pure gold? |
Density is an identifying property. If the density is not exactly 19.3 g/mL, then it is pure gold. |
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Be able to calculate simple and complex conversions. |
Practice using the worksheets we used in class. |
