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Chem - Unit #1
Introduction to Chemistry
| Term | Definition |
|---|---|
| chemistry | the study of matter and how it changes |
| matter | anything that has mass and takes up space |
| substance | matter that has specific composition and properties (aka: chemical) |
| mass | the amount of matter |
| model | a visual representation of something |
| weight | mass + gravitational force |
| quantitative data | information that describes how much, how tall, how fast, how little (numbers) |
| qualitative data | information that describes odour, colour, taste, shape or other physical properties (language) |
| hypothesis | a testable statement made about what has been observed |
| experiment | an activity that allows you to create controlled observations to test a hypothesis |
| conclusion | a judgement that is made based on the information obtained from the experiment |
| independent variable | the variable that is changed during an experiment |
| dependent variable | the variable that changes because of a change in the experiment |
| control | the standard that is used for comparison in an experiment; nothing about it is changed |
| scientific law | a relationship in nature that is supported by many experiments |
| theory | an explanation that is supported by many experiments but can be changed with new information; if it can be used to make predictions that are proven true, it is seen as correct |
| applied research | research that is conducted for a specific reason or to solve a specific problem |
| chance discovery | scientific discovery that happens by accident; it is not intended |
| pure research | research that is conducted because of curiosity or interest |
| synthetic | something that is human-made and may not occur in nature |
| technology | a practical use of scientific information |
| scientific method | the organised process used by scientists to do research and verify the work of others |
| base unit | a unit that is based on an object or event in the physical world |
| derived unit | a unit that is based on two or more other units |
| accuracy | how close a measured value is to an accepted value |
| precision | how close a series of measurements are to one another |
| dimensional analysis | an approach to problem solving that uses conversion factors to move between units |
| conversion factors | a ratio of equal values with different units |
| density | a physical property of matter; the amount of mass per unit of volume |
| volume | the space occupied by an object |
| interpolation | estimating an unknown value that is between two known values |
| extrapolation | estimating an unknown value that is outside the known values |
| macroscopic | large enough to be seen without any assistance |
| microscopic | too small to be seen without a microscope |
| submicroscopic | too small to be seen without using a specialised microscope |
Created by:
nursprung
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