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Into to Chemistry/1/
Term | Definition |
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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 or physical means. |
Atom | The basic particle from which all elements are made. |
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 chemically combined in a specific ratio, or proportion. |
Chemical formula | Symbol that shows 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 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 the mass of a substance to its volume (mass divided by volume). |
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. |