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Chemistry Vocab

Chemistry vocab

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.
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