Term
|
Definition
| A tentative explanation for an observation and a basis for experimentation. |
|
|
Term
|
Definition
| In observations, nonnumerical experimental information, such as a description of color or texture. |
|
|
Term
|
Definition
| Numerical information, such as the mass or volume of a substance, expressed in appropriate units. |
|
|
Term
|
Definition
| A statement that summarizes a wide range of experimental results and has not been contradicted by experiments. |
|
|
Term
|
Definition
| A unifying principal that explains a body of facts and the laws based on them. |
|
|
Term
|
Definition
| A mechanical or mathematical way to make a theory more concrete, such as a molecular model. |
|
|
Term
|
Definition
| Matter of a particular kind: each substance, when pure, has a well-defined composition and a set of characteristic properties that differ from the properties of any other substance. |
|
|
Term
|
Definition
| Properties (e.g., melting point or density) that can be observed and measured without changing the composition of a substance. |
|
|
Term
|
Definition
| Changes in the physical properties of a substance, such as the transformation of a solid to a liquid; |
|
|
Term
|
Definition
| The temperature at which the structure of a solid collapses and the solid changes to a liquid. |
|
|
Term
|
Definition
| The temperature at which the equilibrium vapor pressure of a liquid equals the external pressure on the liquid. |
|
|
Term
|
Definition
| The physical property of matter that determines whether one object can heat another. |
|
|
Term
| Celsius Temperature Scale |
|
Definition
| A scale defined by the freezing (0ºC) and boiling (100ºC) points of pure water, at 1 atm. |
|
|
Term
|
Definition
| The ratio of the mass of an object to its volume. |
|
|
Term
|
Definition
| A method of using units in calculations to check for correctness. |
|
|
Term
| Conversion factor (proportionality factor) |
|
Definition
| A relationship between two measurement units derived from the proportionality of one quantity to another (e.g.. density is the conversion factor between mass and volume. |
|
|
Term
| Chemical change (chemical reaction) |
|
Definition
| A process in which substances (reactants) change into other substances (products) by rearrangement, combination, or separation of atoms. |
|
|
Term
|
Definition
| A substance that is initially present and undergoes change in a chemical reaction. |
|
|
Term
|
Definition
| A substance formed as a result of a chemical reaction. |
|
|
Term
|
Definition
| Describes the kinds of chemical reactions that chemical elements or compounds can undergo. |
|
|
Term
|
Definition
|
|
