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Organic molecule

A molecule that contains only carbon and any of the following: Hydrogen, oxygen, nitrogen, sulfur, and/or phosphorous


The process by which living organisms produce molecules


Two different molecules that have the same chemical formula


Simple carbohydrates that contain three to ten carbon atoms


Carbohydrates that are made up of two monosaccharides


Carbohydrates that are made up of more than two monosaccharides

Dehydration reaction

A chemical reaction in which molecules combine by ejecting water


Breaking down complex molecules by the chemical addition of water


Lacking any affinity to water

Saturated fat

A lipid made from fatty acids which have no double bonds between carbon atoms

Unsaturated fat

A lipid made for fatty acids that have at least one double band between carbon atoms

Peptide bonds

A bond that links amino acids together in a protein

Hydrogen bond

A strong attraction between hydrogen atoms and certain other atoms (usually oxygen or nitrogen) in specific molecules


Anything that has mass and takes up space


An explanation or representation of something that can't be seen


All atoms that contain the same number of protons


Chemicals that result from atoms linking together

Physical change

A change that affects the appearance but not the chemical makeup of a substance

Chemical change

A change that alters the makeup of the elements or molecules of a substance


One of three forms-solid, liquid, or gas-which every substance is capable of attaining


The random motion of molecules from an area of high concentration to an area of low concentration


A measurement of how much substance exists within a certain volume

Semipermeable membrane

A membrane that allows some molecules to pass through but does not let other molecules pass through


The tendency of a solvent to travel across a semipermeable membrane into areas of higher solute concentration


A substance that alters the speed of a chemical reaction but does not get used up in the process

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