Question | Answer |
Chemistry | The study of the nature, properties, and transformations of matter. |
Matter | The physical material that makes up the universe; anything that has mass & occupies space. |
Scientific Method | The systematic process of observation, hypothesis, and experimentation used to expand and refine a body of knowledge. |
Property | A characteristic useful for identifying a substance or object. |
Chemical Change | A change in the chemical makeup of a sunstance. |
Solid | A substance that has a definite shape and volume. |
Liquid | A substance that has a definite volume but assumes the shape of its container. |
Gas | A substance that has neither a definite volume of shape. |
State of Matter | The physical state of a substance as a solid, liquid, or gas. |
Change of State | The conversion of a substance from one state to another- for example, from liquid to gas. |
Pure Substance | A substance that has a uniform chemical composition throughout. |
Mixture | A blend of two or more substances, each of which retains its chemical identity. |
Element | A fundamental substance that cannot be broken down chemically into any simpler substance. |
Chemical Compound | A pure substance that can be broken down into simpler substances by chemical reactions. |
Reactant | A starting substance that undergoes change during a chemical reaction. |
Chemical Reaction | A process in which the identity and composition of one or more substances are changed. |
Chemical Formula | A notation for a chemical compound using element symbols and subscripts to show how many atoms of each element are present. |
Periodic Table | A tabular format listing all known elements. |
Metal | A malleable element with a lustrous appearance that is a good conductor of heat and electricity. |
Nonmetal | An element that is a poor conductor of heat and electricity. |
Metalloid | An element whose properties are intermediate between those of a metal and a nonmetal. |
What kind of properties does matter have? | Physical Properties & Chemical Properties |
Physical Properties | can be seen or measured without changing the chemical identity of the substance. |
Chemical Properties | can ONLY be seen or measured when the substance undergoes a chemical change, such as a chemical reaction. |