Term | Definition |
Radioactive | An unstable isotope that spontaneously emits energy to become more stable. |
Condensation | Particles of a vapor striking the liquid surface and returning to the liquid phase. |
Nuclear fusion | Small nuclei combine to form a larger nucleus. |
Electron | Charge is negative |
Proton | Charge is positive |
Neutron | Charge is neutral |
Kinetic energy | Energy of motion |
Potential energy | Stored energy |
Meter | Standard metric unit for length measurements. |
Liter | Standard metric unit for volume. |
Gram | Standard metric unit for weight. |
Precision | Reproducible or repeatedly obtain measurements with values close together. |
Exact numbers | Numbers obtained from counting or from definitions comparing two units in the same system of meaurements. |
Rem | Represents the measure of biological effect or biological damage done by different kinds of radiation. |
Protons and neutrons | Subatomic particles located in the nucleus of an atom. |
Half-life | The length of time for half of a radioactive sample to decay. |
Hypothesis | A tentative "guess" to explain an observation that can be tested. |
Beta | Type of emission when an unstable nucleus converts a neutron to a proton and emits an electron from the nucleus. |
Calories | Heat that is a form of energy - the appropriate reporting unit for the amount/quantity of heat. |
Atom | Smallest particle of an element |
Physical properties | Shape, color, state of matter, melting point and density. |
Physical changes | Changes in matter |
Chemical changes | An irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance. Ex: rust on metal |
Volume | The amount of space an object occupies. |
Mass | The weight of an object. |
Density | The state or quality of being dense; compactness |
Matter | Anything that occupies space and has mass. |