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chapter 1 chemistry
lessons 1-4
| Question | Answer |
|---|---|
| matter | Anything that has mass and takes up space. |
| chemistry | The study of the properties of matter and how many change. |
| 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 or 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 holds two 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 chemical combined in a specific ratio, or proportion. |
| chemical formula | Symbols that show the elements in a compound and the ratio of atoms. |
| mixture | Two or more substances that are together in the same place but their atoms are not chemically bonds. |
| weight | A measure of the forces of gravity acting on an object. |
| mass | The amount of matter in an object. |
| International System of Units | A system of measurement based on multiple of ten and on established measures of mass, lenght, and time. |
| volume | The amount of the force of gravity acting on a object. |
| density | The ratio of the mass of a substance to its volume. (mass divides by volume). |
| physical change | A change that alters the form of appearance o fa 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 in neither created no destroyed during any chemical or physical change. |
| temperature | How hot or cold something is; a measure of the average energy of motion of the particles of a substance. |
| 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. |
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cdudzic002