A substance formed by the chemical combination of two or more elements in definite proportions.

Ex:  Water, Salt

compounds with an amino group (-NH2) on one end and a carboxyl group (-COOH) on the other end

Compounds made up of carbon, hydrogen, and oxygen atoms, usually in a ration 1:2:1

Living things use these as their main source of energy.  Plants, some animals, and other organisims also use thses for structural purposes.

When people go on a low __________diet, then they must get energy from other sources.

An attraction between molecules of the same substance.

think of water

made mostly from carbon and hydrogen atoms

Common categories of _____ are fats, oils & waxes.

any compound that forms H+ ions in solution

A type of ______ is found in the stomach to help digest food.

basic unit of matter,

Ex:  the smallest piece of chalk, is still chalk

base

a process that changes or transforms, one set of chemicals into another

Ex: rust

Atoms that share electrons have a ______  ____.

Moving electrons travel about the nuclei of both atoms.

A negatively charged particle (-)

They are in constant motion in the space surrounding the nucleus.

A pure substance that consists entirely of one type of atom.

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Proteins that act as biological catalysts.

They speed up chemical reactions that take place in the cells.

hydrongen bond

ions

Positively and neagatively charged atoms.

Atoms are electrically nuetral because they have equal numbers of protons & electrons.

An atom that loses electrons becomes (+) charged and an atom that gains electrons becomes (-) charged, these atoms are then called ______.

mixture

Material composed of two or more elements or compounds that are physically mixed together but not chemically combined.

Ex:  Salt & Pepper

Sugar & Cinamon

small chemical unit that makes up a polymer

Monomer comes from the Greek word monos, meaning single and "meros", meaning "part".

Macromolecules containing hydrogen, oxygen, nitrogen, carbon, and phosphorous.

Polymers assembled from individual monomers known as

nucleotides are _____ ___.

Consistof 3 parts: a 5-carbon sugar, a phosphate group (-PO4), and a nitrogen base.

Play important roles in capturing and transferring energy.

The center of the atom.

Strong forces bind protons and neutrons together to form the _________.

Measurement system divised by chemist to indicate the concentration of H+ ions in solution.

A _ _ of 0 to 7 is acidic.

A _ _ of 7 is neutral.

A _ _ of 7 to 14 is base.

Smaller units join together

The prefix comes from the Greek word polous, meaning "many", so ____ means many parts.

Macromolecules that contain nitrogen as well as carbon, hydrogen & oxygen.

Needed by the body for growth and repair.

substance that is disolved

Ex:  in saltwater, salt is the solute

solvent

The substance in which the solute dissolves.

Ex: waters role in saltwater

Weak forces of attraction.

These forces are not as strong as iconic bonds, they can hold molecules together, especially when the molecules are large.