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Tolli/Stapp 5
Formation of a New Substance - 6.6E
Term | Definition |
---|---|
Chemical Change | A change that alters the identity of a substance resulting in a new substance or substances with different properties. |
Element | A pure substance composed of the same type of atom throughout. |
Compound | A substance made of two or more elements that are chemically combined in fixed amounts. |
Substance | Any form of matter that is uniform throughout and has consistent properties. |
Temperature Change | Increase or decrease of heat energy in a substance may be evidence of a new substance formed during chemical change. |
Color Change | A change in the way something reflects light, can indicate a chemical change. |
Production of Gas | Evidence of a new substance formed from a chemical change. |
Production of a Precipitate | Evidence of a new substance formed from a chemical change, resulting in solid particles that form or separate out of a liquid. |
Production of Light | Evidence of release of energy during a chemical change. |
Matter | Anything that has mass and takes up space. |
Properties | Physical and chemical characteristics of matter used to describe or identify a substance. |
States of Matter | Distinct forms of matter known in everyday experience: solid, liquid, and gas; also referred to as phases. |
Mass | A measure of how much matter is present in a substance. |
Physical Property | Characteristic that can be observed or measured without changing the substance; for example, color, melting point, or conductivity. |
Chemical Property | A characteristic that can only be observed or measured when atoms of matter rearrange during a chemical change. |
Chemical Formula | A shorthand notation that uses chemical symbols and numbers as subscripts to represent the type and number of atoms that are present in the smallest unit of the substance |
Physical Change | A change to a substance that occurs without forming a new substance, such as a change in size or state of matter. |