cset multi

Question Answer
acid a compound that yields hydrogen ions in solution
alkali metals lithium, sodium, and potassium; common as hydroxides
alloy a metal composed of two or more metallic elements
atom the smallest particle of matter that cannot be subdivided by chemical reactions
atomic number the number of protons in an atomic nucleus; the different chemical elements have different atomic numbers
base a compound that yields hydroxyl (OH~)ions in solution
Boyle's law the volume of a gas varies inversely with pressure
carbon dioxide CO2 is a colorless, noncombustible gas under normal conditions
catalyst a substance that accelerates a chemical reaction, without itself being a reactant
Charles' law the volume of a gas varies directly with temperature
combustion rapic oxidation that releases heat and light
compound a substance formed by the chemical union of several chemical elements
decomposition a chemical reaction in which a compound is broken down into simpler compounds or elements
density mass per unit volume of a substance
diffusion the mixing of different substances, commonly in a liquid or gas
distillation the process of purification in which an impure substance is heated to vapors, which are collected and condensed
electrolysis a chemical change brought about by an electric current; used to separate chemical elements
electron a negatively charged, subatomic particle; electrons form a cloud around the atomic nucleus. Electron movement constitutes electrical current.
element a substance that cannot be decomposed to simpler substances
evaporation a change of state from a solid or liquid to a gas
freezing point the temperature at which a liquid changes to a solid
hydrocarbons compounds of carbon and hydrogen
hydrolysis chemical decomposition of a compound by reaction with water
ion a charged atom or group of atoms formed by the gain or loss of electrons
isotope …of an element have the same number of protons and show the same chemical behavior, but they differ in the number of nuclear neutrons and thus in atomic weight; they may be stable or radioactive
litmus paper that turns red in acid and blue in alkaline solution
mixture substances mixed without a chemical reaction; the substances can be in any proportion
molecule the smallest particle of a compound, composed of several bonded atoms
neutron a subatomic particl of zero charge that occurs in the atomic nucleus
organic compound a compound with interconnected carbon atoms
oxidation the addition of oxygen to a substance
pH a number indicating the concentration of hydrogen ions in a solution. A pH of 7 is neutral, less than 7 is acidic and greater than 7 is alkaline
proton a subatomic particle with a positive charge, occurring in the atomic nucleus
saturated describes a solution that contains as much solute as possible
solute the substance dissolved in a solution
solvent the pure liquid within a solution
sublimation the change from a solid to a gas, without an intermediate liquid
synthesis the formation of a compound by combining elements or simpler compounds
asteroid a minor planet or planetary fragment; most of the thousands of known asteroids are between the orbits of Mars and Jupiter
cluster a concentration of stars; some globular clusters contain thousands of stars
comet a diffuse body that glows with a prominent tail when its orbit brings it near the sun
constellation an apparent group of stars
eclipse the obscuring of light from a celestial body by the passage of another body between it and the observer
galaxy an astronomical system composed of billions of stars; galaxies are classified as spiral, elliptical, and irregular
latitude refers to the degrees north or south of the equator
light-year the distance light travels in one year, about 6×10(12)
longitude refers to the degrees east or west of the prime meridian at Greenwich, England
luminosity the intrinsic brightness of a star relative to the brightness of the sun
meteor the streak of light produced by the passage of an interplanetary particle through the earth's atmosphere
meteorite a rock from interplanetary space found on the earth's surface
milky way the spiral galaxy to which our solar system belongs
nebula a cloud of gas or dust in interstellar space
nova a star that suddenly becomes many times brighter than usual
quasar quasi-stellar radio source; a distant object with extraordinary luminosity
star a large, hot, glowing body of gases
sunspot a darker patch observed on the surface of the sun
tide the rise and fall of the ocean due to gravitational attraction by the moon and sun

Leave a Reply

Your email address will not be published. Required fields are marked *