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A buffer is a solution that can resist pH change upon the addition of an acidic or basic components.

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Acid: A chemical substance that neutralizes alkalis, dissolves some metals, and turns blue litmus paper red; typically, a corrosive or sour-tasting liquid of this kind.
Base: A base is a substance that is slippery to the touch, tastes bitter, changes the color of indicators (turns red litmus paper blue), and reacts with acids to form salts.

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Solution: A liquid mixture in which the minor component (the solute) is uniformly distributed within the major component (the solvent).

Suspension: A mixture in which particles are dispersed throughout the bulk of a fluid.

Solutions have tiny molecules and are transparent. Suspension have larger molecules and aren't as transparent

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The heat capacity is the amount of heatrequired to raise the temperature of an object or substance one degree.

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Cohesion: Particles of the same element that stick together.

Adhesion: Particles that are different elements that stick together.

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Polarity simply means that the molecule has both a positively and negatively charged end.

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Hydrogen bonds that are charged to attract with other elements.

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Slight attraction that develops between oppositely charged regions of a nearby molecules.

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Chemical compounds: are held together by chemical bonds and is chemical combination of two or more elements in a definite proportion.

Ionic bond: formed when one or more electrons are transferred from one atom to another

Covalent bond: type of bond between atoms in which the electrons are shared

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one of several forms of a single element, which contains the same number of protons but different numbers of neutrons.

Radioactive isotopes:

some isotopes are radioactive, meaning that their nuclei are unstable and break down at a constant rate overtime.

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Atomic number: The number of protons in the nucleus of an element.

Mass number: Total number of protons and neutrons in the nucleus of an atom.

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Protons are positively charged.

Neutrons are neutral. They don't have a charge.

Electrons are negatively charged.