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Element
A pure substance consisting of only one type of atom.
Molecule
Two or more atoms bonded together, which can be the same or different elements.
Compound
A pure substance composed of two or more different elements chemically bonded.
Mixture
A physical combination of two or more substances where each retains its properties.
Physical Change
A change that does not alter the chemical identity of a substance.
Chemical Change
A change that results in the formation of new substances with new properties.
Evidence of a Chemical Reaction
Signs such as color change, gas formation, precipitate formation, and energy change that indicate a chemical reaction has occurred.
Balancing Chemical Equations
The process of making sure that the same number of each type of atom appears on both sides of a chemical equation.
Scientific Notation
A method to express very large or very small numbers using powers of 10.
Homogeneous Mixtures
Mixtures with uniform composition.
Heterogeneous Mixtures
Mixtures with non-uniform composition.
Filtration
A physical process to separate solids from liquids.
Evaporation
A process of removing a liquid by heating, leaving dissolved solids behind.
Color Change
A sign of a chemical reaction where a new color forms.
Formation of Gas
A sign of a chemical reaction where bubbles appear in the mixture.
Precipitate Formation
The formation of a solid that separates from a liquid.
Energy Change
A sign of a chemical reaction where heat, light, or sound is released or absorbed.
Odor Change
A sign of a chemical reaction where a new smell is noticeable.
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