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science 1 dethloff
vocab
| Question | Answer |
|---|---|
| law of conservation of mass | The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions |
| physical change | Physical changes are changes affecting the form of a chemical substance, but do not change the chemical composition of that substance. |
| chemical change | During a chemical change, substances are changed into different substances. |
| element | In chemistry, an element is a pure substance that cannot be broken down into any simpler substances by chemical methods. |
| chemical formula | A chemical formula or molecular formula is a way of expressing information about the atoms that constitute a particular chemical compound. |
| element (diatomic) molecule | diatomic molecules are molecules composed only of two atoms, of either the same or different chemical elements. |
| compound molocule | A molecule is formed when two or more atoms join together chemically. A compound is a molecule that contains at least two different elements. All compounds are molecules but not all molecules are compounds |
| chemical equation | A chemical equation is the symbolic representation of a chemical reaction where the reactant entities are given on the left hand side and the product entities on the right hand side. |
| chemical reaction | chemical reaction is a process that leads to the transformation of one set of chemical substances to another. |
| reactants (chemical equation) | A substance participating in a chemical reaction, especially a directly reacting substance present at the initiation of the reaction. |
| products (chemical change) | A product is a substance that is formed as the result of a chemical reaction. |
| coefficient (chemical change) | a coefficient is a multiplicative factor in some term of an expression (or of a series); it is usually a number, but in any case does not involve any variables of the expression. |
| subscript (chemical change) | A subscript or superscript is a number, figure, symbol, or indicator that appears smaller than the normal line of type and is set slightly below or above it |
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