Mr. K Quiz Thursday

Hydrogen bond

weak attraction between a hydrogen atom and another atom

Cohesion

attraction between molecules of the same substance

Adhesion

force of attraction between different kinds of molecules

Mixture

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

Solution

type of mixture in which all the components are evenly distributed

Solute

substance that is dissolved in a solution

Solvent

dissolving substance in a solution

Suspension

mixture of water and nondissolved material

pH scale

scale with values from 0 to 14, used to measure the concentration of H+ ions in a solution; a pH of 0 to 7 is acidic, a pH of 7 is neutral, and a pH of 7 to 14 is basic

Acid

a compound that forms hydrogen ions (H+) in solution; a solution with a pH of less than 7

Base

a compound that produces hydroxide ions (OH-) in solution; a solution with a pH of more than 7

Buffer

a compound that prevents sharp, sudden changes in pH

Atom

the basic unit of matter

Nucleus

in cells, structure that contains the cell's genetic material in the form of DNA

Electron

negatively charged particle; located in the space surrounding the nucleus

Element

pure substance that consists entirely of one type of atom

Isotope

one of several forms of a single element, which contains the same number of protons but different numbers of neutrons

Compound

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

Ion

atom that has a positive or negative charge

Ionic bond

chemical bond formed when one or more electrons are transferred from one atom to another

Molecule

smallest unit of most compounds that displays all the properties of that compound

Covalent bond

type of bond between atoms in which the electrons are shared

van der Waals forces

slight attraction that develops between oppositely charged regions of nearby molecules