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A measure of the amount of matter in an object. Mass is usually measured in grams or kilograms.

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Law of Definite Proportions (Law of Constant Composition)

The law stating that a pure substance will always have the same percent by weight. Different samples of a pure compound always contain the same elements in the same proportions by mass.

Distilland

The material in a distillation apparatus that is to be distilled.

Deposition

The direct solidification of a vapor by cooling, the reverse of sublimation.

Halogens

Group VIIA elements: F, Cl, Br, I

Alpha (a) Particle

Helium ion with 2+ charge, an assembly of two protons and two neutrons.

Law of Conservation of Matter and Energy

The total amount of matter and energy available in the universe is fixed.

Surface Tension

It is the force in dynes acting along the surface of the liquid 1cm in length and perpendicular to it.

Dipole-dipole Interactions

Attractive interactions between polar molecules, that is, between molecules with permanent dipoles.

Organic Chemistry

The chemistry of substances that contain carbon-hydrogen bonds.

Law of Combining Volumes (Gay-Lussac's Law)

At constant temperature and pressure, the volumes of reacting gases (and any gaseous products) can be expressed as ratios of small whole numbers.