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Chapters 2&3: Matter
Question | Answer |
---|---|
Physical changes do not change | a substance's identity. |
Chemical Change | a change that occurs when one or more substances change into entirely new substances with different properties. |
Mixtures can be seperated by | physical changes. |
Compounds must be broken down by | chemical changes. |
Examples of Physical Changes: | cutting, crushing, reshaping, changing state, dissolving |
Examples of Chemical Changes: | burning, rusting, digesting, decomposing |
Atom | the smallest unit of an element that maintains the chemical properties of that element |
Boiling Point | the temperature and pressure at which a liquid becomes a gas |
Chemical Change | a change that occurs when one or more substances change into an entirely new substance with different properties |
Compound | a substance made up of 2 or more atoms of 2 ore more differnt elements joined by compound bonds |
Element | a substance that cannot be seperated or broken down into small substances |
Molecule | a group of atoms that are held together by chemical forces |
Pure Substance | a sample of matter, either a single elemet or a combo, that has definite mass and takes up space |
Reactivity | the capacity of a substance to combine chemically with another substance |
The identity of a substance does not change during a change of _____, but the ______ of a substance does change. | state, energy |
Changes of state that require energy: | melting, evaporation, and sublimation |
Changes of state that release energy: | freezing and condensation |
Mass and energy are both | conserved |
The Law of Coservation of Mass/Energy: | In chemical and physical changes, the total MASS or ENERGY of the substance undergoing the change stays the same BEFORE AND AFTER the change |
Kinetic Theory of Matter: | Matter is made up of atoms and molecules. |
Particles are always in | motion |
The higher the temperature of the substance is, | the faster it moves. |
More massive particles | move slower than less massive ones. |
You can classify matter as | a solid, liquid, or gas |
You can classify matter by determining if | the shape and volume are definite or variable. |
The most common state of matter | Plasma |
All particles have kinetic energy because they have | motion. |
Tmperature is a measure of average | kinetic energy. |
Thermal energy depends on ______ and ______ of partcles. | speed, number |
Amorphous Solids: | Rubber bands are a solid, BUT DON'T HAVE A DEFINITE SHAPE. |
Every sample of matter is either an | element, compound, or mixture. |
Heterogeneous Mixture: | Substances aren't mixed uniformly and are not evenly distributely. |
Homogeneous Mixture: | Substances are evenly distributed, and the mixture if the same throughout. |
Miscible: | Substances that CAN BE mixed. |
Gases can/cannot mix with liquids. | CAN |
Salt | Compound |
Gold | Element |
Glucose | Compound |
Water | Compound |