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chapters 1 through 9
| Question | Answer |
|---|---|
| Chemistry | the study of matter and the changes that it undergoes. |
| matter | anything that has mass and takes up space. |
| mass | a measurment that reflects the amount of matter. |
| weight | a measure not only of the amount of matter but also of the effect of Earth's gravitational pull on that matter. |
| scientific method | a systematic approach used in scientific study, whether it is chemistry, biology, physics, or other sciences. |
| qualitative data | information that describes color, odor, shape, or some other physical characteristics. |
| quantitative data | the numerical information that tells you how much, how little, how big, how tall, or how fast something is. |
| hypothesis | a tentative explanation for what has been observed. |
| experiment | a set of controlled observations that test the hypothesis. |
| independent variable | the variable that you plan on changing. |
| dependent variable | because its value changes in response to a change in the independent variable. |
| control | a standard for comparison. |
| model | a visual, verbal, and or mathematical explanation of experimental data. |
| theory | an explanation that has been supported by many, many experiments. |
| scientific law | a relationship in nature that is supported by many experiments. |
| pure research | seeks to gain knowledge for the sake of knowledge itself. |
| applied research | research undertaken to solve a specific problem. |
| technology | the practical use of scientific information. |
| base unit | a defined unit in a system of measurement that is based on an object or event in the physical world |
| second(s) | the SI base unit for time. |
| meter | the SI base unit for length. |
| kilogram | the SI base unit for mass |
| dereved unit | a unit that is defined by a combination of base units. |
| liter | the metric unit for volume equal to one cubic decimeter. |
| density | a ratio that compares the mass of an object to its volume. |
| kelvin | the SI base for temperature |
| scientific notation | expresses numbers as a multiple of two factors: a number between 1 and 10; and ten raised to a power or exponent. |
| conversion factor | a ratio of equivalent values used to express the same quantity in different units. |
| dimensional analysis | a method of problem-solving that focuses on the units used to describe matter. |
| accuracy | refers to how close a measured value is to an accepted value. |
| percision | refers to how close a series of measurements are to one another. |
| percent error | the ratio of an error to an accepted value. |
| signification figure | all known digits plus one estimated digit. |
| raph | a visual display of data. |
| substance | matter that has a uniform and unchanging composition. |
| physical property | a characteristic that can be observed or measured without changing the sample's compostion. |
| extensive properties | are dependent upon the amount of substance present. |
| intensive properties | independent of the amount of substance present. |
| chemical properties | the ablitiy of a substance to combine with or change into one or more other substance. |
| states of matter | three different forms of matter: solid, liquid, gas. |
| solid | a form of matter that has its own definite shape and vloume. |
| liquid | a form of matter that flows, has consistent volume, and takes the shape of its container. |
| gas | a form of matter that flows to conform to the shape of its container and fills the entire volume of its container. |
Created by:
kittyboo27
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