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23 Cards in this Set
- Front
- Back
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Pure substance |
A substance that contains only one element or compound.
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Mixture
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A substance that contains different compounds and/or elements.
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covalent compound
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entirely made up of nonmetals
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ionic
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made up of a metal and a nonmetal
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decompose
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Act of separating a pure substance before their individual components can be physically separated.
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Homogeneous mixture
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A mixture with a composition that is always the same no matter what part of the sample you are observing.
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Heterogeneous mixture
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A mixture with a composition that is different depending on what part of the sample you are observing.
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Chemical change
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A change that affects the type of molecules or atoms in a substance.
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Physical change
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A change in which the atoms or molecules in a substance stay the same
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phase change
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When a substance changes from solid to liquid (or vice versa) or a change from liquid to gas (or vice versa). Requires only one thing: energy.
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melting
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The transition from solid to liquid.
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freezing
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liquid turning into solid
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boiling
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going from a liquid to a gas
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condensing
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going from gas to liquid
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melting point
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The temperature at which a substance changes from solid to liquid.
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boiling point
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The temperature at which a substance goes from its liquid phase to its gas phase.
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The kinetic theory of matter
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Molecules and atoms are in constant motion, and the higher the temperature, the greater their speed.
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chemical reaction
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when the molecules within a substance change into different molecules
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chemical equation
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chemical reactions written down in down in an abbreviated form
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homonuclear diatomics
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Elements in nature that are not composed of individual atoms, but instead they are composed of individual MOLECULES.
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reactants
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The atoms and molecules that appear on the left side of the arrow represent the substances that exist before the chemical change takes place.
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products
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The atoms and molecules on the right side of the equation that represent the substances which are produced by the chemical reaction.
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balanced chemical equation
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Since atoms cannot be created or destroyed, the total mass before a chemical reaction takes place is dependent on the number of each type of atom in the reactants. Thus, when the reaction is over, we must have the same number of each type of atom in the products, or the mass will not be the same.
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