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Miriam's Chem. Stack
| Question | Answer |
|---|---|
| Law of Conservation of Mass | Nothing is ever created or destroyed, only changed. Product always = Reactants. |
| Physical Change | Affects only physical properties, such as its size and shape, or whether it is a solid, liquid, or gas. |
| Chemical Change | Produce new substances that have properties different from those of the original substance, E.x: burning or rust on a bike's handlebars. |
| Element | Substance that cannot be broken down into simpler substances. |
| Chemical Formula | A combination of chemical symbols and numbers to represent a substance. |
| Element Molecule | Molecules composed only of two atoms of either the same or different chemical elements. |
| Compound Molecule | The molecule is the smallest unit of a compound. |
| Chemical Equation | Shorthand form for writing what reactants are Used and what products are formed in a chemical reaction. |
| Chemical Reaction | Process that produces chemical change, resulting in new substances that have properties different from those of the original substances. |
| Reactants | Substance that exists before a chemical reaction begins. |
| Products | Substance that forms as a result of a chemical reaction. |
| Coefficient | Indicates the number of molecules of reactants or products. |
| Subscript | Numbers used to tell you how many atoms of an element are present in the equation. |