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| The scientific study of relationships between organisms and their environment. |
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| Exists in three distinct states - solid, liquid, and gas, due to differences in the arrangement of its constitutive particles. Composed of elements. |
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| Neither created nor destroyed, but recycled. Is transformed and combined in different ways, but doesn't disappear. |
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| Substances that cannot be broken down into simpler forms by ordinary chemical reactions. Composed of atoms. |
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| The smallest particles that exhibit the characteristics of the element. Composed of positively charged protons, negatively charged electrons, and electrically neutral neutrons. |
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| Characteristic number of protons per atom for each element. |
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| Forms of a single element that differ in atomic mass. |
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| Substances composed of different kinds of atoms. |
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| A pair or group of atoms that can exist as a single unit. |
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| Charged atoms (or combinations of atoms). |
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| Substances that readily give up hydrogen ions in water. |
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Definition
| Substances that readily bond with H+ ions (or Alkaline Substances). |
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