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