Chemistry Terms

Chemistry Terms at Chemistry Notes Info

Chemical-any substance that has a defined composition

Chemical reaction- the process by which one or more substances change to produce one or more different substances

States of matter-the physical forms of matters, which are solid, liquid, gas, and plasma

 

Reactant- a substance or molecule that participates in a chemical reaction

 

Product- a substance that forms in a chemical reaction

 

Matter-anything that has mass and takes up space

 

Volume-a measure of the size of a body or region in three-dimensional space

 

Mass-a measure of the amount of matter in an object; a fundamental property of an object that is not affected by the forces that act on the object, such as the gravitational force

 

Weight- a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe

 

Quantity- something that has magnitude, size, or amount

 

Unit- a quantity adopted as a standard of measurement

 

Conversion Factor- a ration that is derived form the equality of two different units that can be used to convert from one unit to the other

 

Physical property- a characteristic of a substance that does not involve a chemical change, such as density, color, or hardness

 

Density –the ratio of the mass of a substance to the volume of the substance; often expressed as grams per cubic centimeter for solids and liquids and as grams per liter for gases

 

Chemical Property- a property of matter that describes a substance’s ability to participate in chemical reactions

 

Atom- the smallest unit of an element that maintains the properties of that element

 

Pure Substance- a sample of matter, either a single element or compound, that has definite chemical and physical properties

 

Element- a substance that cannot be separated or broken down into simpler substances by chemical means’ all atoms of an element have the same atomic number

 

Molecule- the smallest unit of a substance that keeps all of the physical and chemical properties of that substance; it can consist of one atom or two or more atoms bonded together

 

Compound- a substance made up of atoms of two or more different elements joined by chemical bonds

 

Mixture- a combination of two or more substances that are not chemically combined

 

Homogeneous- describes something that has a uniform structure or composition throughout

 

Heterogeneous- composed of dissimilar components