Chemistry Word Wall

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A description of how close a measurement is to the true value of the quantity measured. The metric unit used to measure temperature. A tiny negatively charged subatomic particle moving around outside the nucleus of the atom in the energy levels. Any atoms having the same number of protons but different numbers of neutrons. A characteristic of a substance that can be observed or measured without changing the composition of the substance.
The measured amount of a product of a reaction. The volume of a gas increases as the temperature of that gas increases. An arrangement of electrons in an atom. The SI unit for temperature. The exactness of a measurement.
The apparent loss in weight of a body immersed in a fluid is equal to the weight of the displaced fluid. Any substance that has a defined composition. A substance that cannot be separated or broken down into simpler substances by chemical means. The amount of matter in an object. A substance that is a result of a chemical change.
An ion that has a negative charge. The chemical symbols and numbers indicating the atoms contained in the basic unit of a substance. A state in which an atom has more energy than it does at its ground state. The sum of the numbersof protons and neutrons that make up the nucleus of an atom. A postively charged sub-atomic particle made of quarks located in the nucleus of an atom.
The smallest unit of an element that maintains the properties of that element. The way a substance reacts with others to form new substances with different properties. A property that depends upon the amount of material in a sample. Elements that are good conductor of heat and electricity; form positive ions; located on the left of the periodic table. Any matter that has a fixed composition and definite properties; element or compound.
The mass of an atom expressed in atomic mass units. The process by which one or more substances change to produce one or more different substances. The English unit used to measure temperature. Elements that have properties of both metals and nonmetals; located on the staircase of the periodic table. A substance that undergoes a chemical change.
The number of protons in the nucleus of an atom The scientific study of the composition, structure, and properties of matter and the changes it undergoes. A verticle column of elements in the periodic table; also called a family. A compination of two or more substances that are not chemically combined. A reaction in which atoms of one element take the place of atoms of another element in a compound.
The physical theory of the structure, properties, and behavior of the atom. A whole number that appears in front of a chemical formula to represent how many of that compound or molecule there is in the reaction. The time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope/ The SI base unit used to measure the amount of a substance whose number of particles is the same as the number of atoms of carbon in exactly 12 g of carbon-12. A homegeneous mixture of two or more substances uniformily spread throughout a single phase.
The principle that states that the structure of each successive element is obtained by adding one proton to the nucleus of the atom and one electron to the lowest-energy orbital that is available. A mixture of very tiny particles of pure substances that are dispersed in another substance but do not settle out of the substance. The transfer of energy from the particles of one object to those of another object due to a temperature difference. A group of atoms that are held together by chemical forces. Standard Temperature and Pressure: for a gas, the temperature of 0oC  and the pressure of 1.00 atm.
The number of atoms for the products must equal the number of atoms for the reactants after the chemical reaction. A reaction in which a hydrocarbon and oxygen burn to produce carbon dioxide and water. A mixture that is not of the same composition throughout. A neutral sub-atomic particle made of quarks located in the nucleus. A number at the lower right of an element's symbol to represent the number of atoms of that element in a compound or molecule.
An instrument that measures atmospheric pressure. A substance made up of atoms of two or more different elements joined by chemical bonds. A mixture that has the same composition throughout. The splitting of the nucleus of a large atom into two or more fragments; releases additional neutrons and energy. A mixture that looks uniform when stirred or shaken that seperates into different layers when it is no longer agitated.
The pressure in a stream of fluid is reduced as the speed of the flow is increased. A bond formed  when atoms share one or more pairs of electrons: nonmetal and nonmetal. The rule that states that for an atom in the ground state, the number of unpaired electrons is the maximum possible and these unpaired electrons have the same spin. The combination of the nuclei of small atoms to form a larger nucleus; releases energy. A reaction of at least two substances that forms a new, complex compound.
The volume of a gas decreases as the pressure increases. A reaction in which one compound breaks into at least two products. A physical property of the system that does not depend on the system size or the amount of material in the system. Poor conductors of heat and electricity; form negative ions; located on the right side of the periodic table. A measure of the average kinetic energy of all the particles within an object.
A substnce that changes the rate of chemical reactions without being consumed/ The ratio of the mass of a substance to the volume of the substance. An atom or group of atoms that has lost or gained one or more electrons and therefore has a net electric charge. A horizontal row of elements in the periodic table. The maximum amount of product that can be produced from a given amount of reactant.
An ion that has a positive charge. A reaction in which a product is formed from the apparent exchange of atoms or ions between two compounds. A bond formed by the attraction between oppositely charged ions: metals and nonmetals. A substance changing between the 4 states of matter. An electron in the outermost energy level of an atom.