a compound that dissociates in water to form hydrogen ions

has a nucleus that contains neutrons and protons (positive charge); electrons (negative charge)

a compound that forms a salt and water following reaction with an acid

the amount of heat needed to raise the temperature of one gram of water one degrees Celsius

a substance that changes (usually speeds up) the rate of a chemical reaction without itself being permanently changed

any process that results in the production of different substances with new properties

a complex green pigment that captures light energy, for use in photosynthesis

a structure, composed primarily of DNA, that contains the genes

two or more elements combined chemically in definite proportions by weight

treatment group used for comparison

parts of the experiment that the scientists keep the same

mass per unit volume

the variable that the scientists are measuring

the movement of molecules from a region of greater concentration to a region of lesser concentration

as the independent variable increases or decreases, the dependent variable does the same

the hereditary material in cells

a substance that cannot be chemically changed into a simpler substance

change over time

a substance that takes the shape and fills the volume of its container

the variable that scientists intentionally change

the energy of motion

substance that takes the shape of the vessel that contains it, does not necessarily fill its container

the ability of a metal to have its shape permanently changed by applying force, e.g., hammering

the measure of the amount of matter in an object; the mass of an object remains the same regardless of the force of gravity

the smallest unit of an element or a compound, 2+ covalently bonded

the cell organelle that controls the cell's activities and contains DNA

relating to compounds that contain carbon and hydrogen

the extent to which a membrane allows different molecules to pass through it

a measure of the acidity of a solution

the process in which energy is used to form carbohydrate and oxygen from carbon dioxide and water

complex organic molecule composed of a chain of amino acids

elements that emit particles and radiation during the spontaneous disintegration of their nuclei

occurs when light bounces off a surface

matter that has a definite shape and volume

homogeneous mixture formed when one substance dissolves in another

a substance in which a solute dissolves to form a solution

describes a material that flows slowly

the measure of the gravitational force that attracts an object