science ch 2 vocab Flashcards
(16 cards)
The scientific study of the composition, structure, and properties of matter and the changes that matter undergoes.
Chemistry
Anything that has mass and takes up space.
Matter
A substance that cannot be separated or broken down into simpler substances by chemical means.
Element
The smallest unit of an element that maintains the properties of that element.
Atom
A substance made of atoms or two or more different elements that are chemically combined.
Compound
The smallest unit of a substance that keeps all of the physical and chemical properties of that substance.
Molecule
A combination of chemicals symbols and numbers to represent a substance.
Chemical formula
A sample of matter, either a single element or a single compound, that has definite chemical and physical properties.
Pure substance
A combination of two or more substances that are not chemically combined.
Mixture
The temperature and pressure at which a solid becomes a liquid.
Melting point
The temperature at which a liquid becomes a gas.
Boiling point
The ratio of the mass of a substance to the volume of a substance.
Density
The ability of a substance to combine chemically with another substance.
Reactivity
The ability of a substance to react in the presence of oxygen and burn when exposed to a flame.
Flammability
A change of matter from one form to another without a change in chemical properties.
Physical change
A change that occurs when a substance changes composition by forming one or more new substances.
Chemical change
