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SCI-7 U2
All Words
| Term | Definition |
|---|---|
| matter | Anything around us that has mass and volume. |
| atom | The smallest piece of matter that still has all of the properties of that matter. |
| molecule | A group of atoms that are chemically joined together and act as a unit. Must contain at least two atoms, but they may be two atoms of the same element. |
| density | The amount of mass in an object’s volume. |
| conductivity | The physical property of matter that describes how well a substance conducts electricity. |
| flammability | The chemical property of matter that describes the matter's ability to burn. |
| reactivity | The chemical property of matter that describes the rate at which the matter will undergo a chemical change or chemical reaction. |
| pH | The chemical property of matter that describes the acidity or basicity of that matter. |
| solid | The phase of matter that has definite shape and definite volume, is incompressible, and the atoms or molecules are tightly packed and do not have much room between them. |
| liquid | The phase of matter that has definite volume, but no definite shape, is incompressible, and the atoms or molecules are more spread out and have some room between them. |
| gas | The phase of matter that has no definite shape or definite volume, is compressible, and the atoms or molecules spread very far apart and have the most space between them. |
| plasma | The phase of matter that is a super-heated gas that has no definite shape or definite volume, is compressible, the atoms or molecules spread very far apart and have the most space between them, and electrons are lost from the atoms. |
| melting | Occurs when heat energy is added to a solid, causing its atoms or molecules to move faster and faster, becoming a liquid. |
| freezing | Occurs when the molecules or atoms of a liquid lose heat energy, making them slow down to form a solid. |
| vaporization | Occurs when the molecules of a liquid are heated. The molecules move faster and further apart, becoming a gas. |
| condensation | Occurs when the molecules of a gas lose heat energy. This makes them slow down and move closer together, forming a liquid. |
| deposition | Occurs when a gas changes directly into a solid without ever going through the liquid phase. Only a few common substances do this. |
| sublimation | Occurs when a solid changes directly into a gas without ever going through the liquid phase. Only a few common substances do this. |
| phase change | The process of matter changing from one phase to another. |
| elements | The simplest pure substances that are made up of only one kind of atom and have definite properties. |
| physical changes | Changes in matter that only change the appearance of the matter. |
| chemical changes | Changes in matter that involve changes in the atomic arrangement. |
| nuclear changes | Changes in matter that involve a change in the number of protons in the nucleus itself. |
| chemical reaction | Occurs when substances are mixed and a chemical change occurs. |
| compound | A substance that contains 2 or more different elements combined as a result of a chemical change. |
| activation energy | The energy required to be put into a chemical reaction in order to get it started. |
| reactants | The materials or substances that react together during a chemical reaction. |
| products | The substances that are formed during a chemical reaction. |
| catalyst | A substance that speeds up the rate of a reaction but does not take part in a chemical reaction. |
Created by:
susanmason
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