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Chemistry Vocab
Chemistry vocab
Question | Answer |
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What is the Law of Conservation of Mass? | Law of Conservation of Mass is a relation stating that in a chemical reaction, the mass of the products equals the mass of the reactants. |
Describe a physical change. | Cutting a apple. Cutting a apple is a physical change because the apple is still a apple no matter how small you cut it. |
What is a example of a chemical change? | A piece of iron rusting. It is a chemical change because there is a chemical reaction changing the iron into another substance. |
Define element. | Elements are chemically the simplest substances and hence cannot be broken down further using chemical methods. Elements can only be changed into other elements using nuclear methods. |
What is a chemical formula? | A chemical formula or molecular formula is a way of expressing information about the atoms that constitute a particular chemical compound. Al2(SO4)3 is a example of a chemical formula, aluminum sulfate |
What is a Diatomic molecule? | Diatomic molecules are molecules composed only of two atoms, of either the same or different chemical elements. |
What is a subscript? | Subscripts in chemistry are used in writing formulas. In H2O, the 2 is the subscript. The subscript indicates the number of the preceding element. In H2O there are 2 hydrogen and 1 oxygen elements. |
Define reactant. | A substance participating in a chemical reaction, especially a directly reacting substance present at the initiation of the reaction. |