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Chemical Reactions
Chemical Properties, Changes, and Reactions
| Term | Definition |
|---|---|
| Physical Property | a characteristic that can be observed or measured without changing the identity of the substance |
| Chemical Property | a property of matter that describes a substance's ability to participate in chemical reactions |
| Chemical Reaction | the process by which one or more substances change to produce one or more different substances |
| Solubility | A measure of how much solute can dissolve in a given solvent at a given temperature |
| Mass | the amount of matter in an object |
| Volume | The amount of space an object takes up |
| Density | Mass per unit volume |
| Flammability | the ability of a substance to burn |
| Conductivity | The ability of an object to transfer heat or electricity to another object |
| Reactivity | The ease and speed with which an element combines, or reacts, with other elements and compounds |
| Physical Change | A change in a substance that does not involve a change in the identity of the substance |
| Chemical Change | A change that occurs when one or more substances change into entirely new substances with different properties |
| Law of Conservation of Mass | Matter is not created nor destroyed in any chemical or physical change |
| Precipitate | a solid that forms and settles out of a liquid mixture |
| Tarnish | a change in chemical composition when exposed to air |
| Rust | the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water |
| Signs of a Chemical Change | change in color, a change in odor, the formation of bubbles/gas, the formation of a precipitate or a change in energy (heat absorbed or released, light or sound released) |
| Chemical Equation | uses element symbols and chemical formulas to show a reaction |
| Subscript | represent the number of atoms of that element in the chemical compound |
| Coefficient | represent the number of that chemical element or compound in the reaction |
| Reactants | the chemicals used to start a chemical reaction |
| Products | what is made in that chemical reaction |
| Exothermic Reaction | occur when the chemical reaction absorbs thermal energy from the environment |
| Endothermic Reaction | occur when the chemical reaction gives off thermal energy to the environment |
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