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Chapter 1
Intro to chemistry
| Term | Definition |
|---|---|
| matter | Anything that has mass and takes up space |
| chemistry | The study of the properties of matter and how matter changes |
| substance | A single kind of matter that is pure and has a specific set of properties |
| physical property | A characteristic of a pure substance that can be observed without changing it into another substance |
| chemical property | A characteristic of a substance that describes its ability to change into different substances |
| element | A substance that cannot be broken down into any other substances by chemical and physical means |
| atom | The basic particle from which all elements are made; the smallest particle of an element that has the properties of that element |
| chemical bond | The force of attraction that hold atoms together |
| molecule | A neutral group of two or more atoms held together by covalent bonds |
| compound | A substance made of two or more elements chemically combined in a specific ratio or proportion |
| chemical formula | Symbols that show how the elements in a compound and the ratio of atoms |
| mixture | Two or more substances that are together in the same place but there atoms are not chemically bonded |
| weight | A measure of the force of gravity acting on an object |
| mass | The amount of matter in an object |
| International System of Units | A system of measurement based on multiples of ten and on established measures of mass, length, and time |
| volume | The amount of space that matter occupies |
| density | The ratio of mass of a substance to its volume (m/v) |
| physical change | A change that alters the form or appearance of a material but does not make the material into another substance |
| chemical change | A change in which one or more substances combine or break apart to form new substances |
| law of conservation of mass | The principle that the total amount of matter is neither created nor destroyed during any chemical or physical change |
| temperature | How hot or cold something is |
| thermal energy | The total energy of the motion of all the particles of an object |
| endothermic change | A change in which energy is absorbed |
| exothermic change | A change in which energy is released |
| chemical energy | A form of energy that is stored in chemical bonds between atoms |
Created by:
mwienclaw002
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