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Science 8 Chapter 3
Chemical Reactions
Term | Definition |
---|---|
energy | one of the spaces around the nucleus of an atom in which an electron moves |
ion | an atom that has either a positive or a negative charge |
chemical bond | the attractive force that hold atoms together |
chemical formula | tells the kinds of atoms and how many of each kind are in a compound |
subscript | a number in a formula that tells the number of atoms of an element in a compound |
radicals | a group of two or more atoms that acts like one atom |
chemical reaction | a chemical change in which elements are combined or rearranged. |
mixture | a combination of substances in which no reaction takes place |
chemical equation | a statement that uses symbols, formulas, and numbers to stand for a chemical reaction |
product | a substance that is formed in a chemical reaction |
law of conservation of matter | matter cannot be created or destroyed in chemical and common physical changes |
balance | to keep the number of atoms the same on both sides of the equation |
coefficient | a number placed before a formula in a chemical equation |
dissolve | to break apart |
solution | a mixture in which one substance is dissolved in another |
solute | the substance that is dissolved in a solution |
solvent | a substance capable of dissolving one or more other substances |
chemical change | a change that produces one or more new substances with new chemical properties |
physical change | a change in which the appearance (physical properties) of a substance changes but its chemical properties stay the same. |