Chemistry.

acid correct answers compound that gives off H+ ions in solution acidic correct answers describes a solution with a high concentration of H+ ions anion correct answers ions with a negative charge anode correct answers the electrode where electrons are lost (oxidized) in redox reactions atmospheres correct answers common units for measuring pressure atom correct answers the smallest object that retains properties of an element. Composed of electrons and a nucleus (containing protons and neutrons) atomic number correct answers number of protons in an element Avogadro's number correct answers number representing the number of molecules in (1) mole: 6.022 * 10 to the 23 power base correct answers substance which gives off hydroxide ions (OH-) in solution basic correct answers having the characteristics of a base Bohr's atom correct answers He made significant contributions to the atom. He understood the line spectra--the reason why only certain wavelengths are emitted when atoms jump down levels buffer solutions correct answers solutions that resist change in their pH, even when small amounts of acid or base are added catalyst correct answers substances that speed up a chemical process without actually changing the products of reactions cathode correct answers electrode where electrons have gained (reduction) in redox reactions cations correct answers ion with positive charge central atom correct answers in a Lewis structure, usually the atom that is the least electronegative charge correct answers describes an object's ability to repel or attract other objects. Protons have a positive ...while electrons have a negative... Like ...repel each other, while opposites attract. chemical changes correct answers processes or events that have altered the fundamental structure of something chemical equation correct answers an expression of a fundamental change in the chemical substance colligative properties correct answers properties of a solution that depend only on the number of particles dissolved in it, not the properties of the particles themselves. The main ones are boiling point elevation and freezing point depression. combustion correct answers when substances combine with oxygen and release energy compound correct answers two or more atoms joined together chemically, with covalent or ionic bonds concentration correct answers the amount of a substance in a specified space conjugate acid correct answers a substance which can lose H+ ion to form a base conjugate base correct answers a substance which can gain H+ ion to form an acid covalent bonds correct answers when two atoms share at least one pair of electrons decay correct answers change of an element into a different element, usually with some other particle(s) of energy emitted density correct answers mass per unit volume of a substance