9 weeks test
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Chemistry is best defined as the study of | all substances and the changes that they can undergo
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| Chemistry has been called the central science because it | Overlaps so many sciences
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| A tentative or suggested answer to a question, formulated before experimentation is called a | Hypothesis
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| The factor being tested in an experiment is called the | Theory
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| An idea that describes how nature behaves but does not explain why nature behaves in the way it does is called the | Natural Law
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| In science, a properly formulated hypothesis | Must always be able to be tested
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| Responds in a predictable way to the experiment | An experimental control
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| SI base unit for mass | Kilogram
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| SI base unit of volume is the | Cubic meter
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| The abbreviation for millimeter | mm
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| kelvin, volt, and ampere are all | SI units
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| The liter is a non-SI unit of | volume
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| The prefix kilo makes the unit larger or smaller? | Larger
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| How many liters are there in a cubic meter? | 1000
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| A graduated cylinder is an instrument used for what? | to measure liquid volume
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| a plus sign with a line under it expresses what? | uncertainty of measurement
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| A recorded measurement has two certain digits and one estimated digit. How many significant digits does the measurement have? | Three
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| In multiplication and division of measured values, the measured value that determines the number of significant digits in the answer is the one that has the | Smallest number of significant digits
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| How should you round off a number that ends with the digit 5? | Round up
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| How many significant figures are in the number 2.005? | 4
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| What is 2.5 x 10 to the negative 4 power in normal notation | 0.00025
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| How many significant figures are there in 1.9800? | 5
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| Warns you that it is dangerous to breathe vapors from this substance and that you should not let the substance come in contact with your skin? | skull on the bottle symbol
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| Reminds you never to touch your face or eyes during a laboratory investigation | hand under a fosset symbol
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| Warns you to tie back long hair and loose clothing | fire symbol
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| Indicates that you should use a wafting motion fume hood | flames coming out of a cylinder symbol
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| Indicates that you need to get directions from your teacher about disposing of chemicals | cylinder with a diamond on it
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| A number written in scientific notation is made up of the | significant digits of the original number and 10 written with an exponent
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| The percent error is equal to 100 percent multiplied by | measured value - accepted value / accepted value
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| Density is equal to | mass/volume
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| Dimensional analysis is a technique of | converting between units
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| Conversion factor to convert grams to kilograms | 1 kg/1000 g = 1
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| In a graph, the variable that ranges along the horizontal, or x, axis is the | independent variable
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| The capacity to do work is called | energy
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| What is the SI unit of energy | joule
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| The amount of heat needed to raise the temperature of 1 gram of water by 1 celsius degree is called a | calorie
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| In any process, energy is neither created nor destroyed is a statement of | the law of conservation of energy
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| Anything that has mass and volume is called | matter
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| Burning is not a change in state |
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| Density | is a physical property
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| Crushing is a | physical change
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| A substance that cannot be separated into simpler substances by a chemical change is called an | element
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| A substance that contains two or more elements chemically combined in a fixed proportion is called a | compound
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| Pure substances include | Elements and compounds
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| Element symbols consist of | one or two letters
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| CO is the formula of a | compound
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| A blend of two or more pure substances is called a | mixture
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