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Unit 4 VOCAB!
Question | Answer |
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chemistry | The synthysetic study of the natural world |
chemical bond | an attraction between atoms or molecules and allows the formation of chemical compounds, which contain two or more different atoms |
chemical change | A reaction that transforms (changes) a substance into a new substance or substances with different properties |
chemical formula | A combination of chemical symbols and numbers that indicates which elements and how many atoms of each element are present in a compound |
chemical property | A property or characteristic of a substance having to do with how the atoms and molecules that make up the substance can be combined with or rearranged into other substances |
compound | A pure chemical substance consisting of two or more different different chemical elements that can be separated into other substances by chemical reactions |
covalent bond | A type of chemical bond in which atoms are held together in a molecule by sharing one or more electrons in their outer shells |
endothermic reaction | Pertaining to a chemical change that is due to the absorption of heat |
exothermic reaction | Pertaining to a chemical change that has to do with the release of heat |
ion | An atom or molecule in which the total number of electrons is not equal to the total number of protons |
ionic bond | A chemical bond in which one atom loses an electron to form a positive ion and the other atom gains an electron to form a negative ion |
periodic | Happening or recurring at regular intervals; having repeated cycles |
precipitate | The formation of a solid |
valence electrons | An electron in the outer shell of an atom which can combine with other atoms to form molecules |