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chemistry...........
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| Question | Answer |
|---|---|
| The branch of science that deals with the study of the composition, structure, and properties of matter and the changes that matter undergoes. | Chemistry |
| A branch foundational to the other areas of chemistry, deals with applying the theories of physics to the study of the reactions and properties in matter. | Physical Chemistry |
| The study of substances which are compounds of carbon. | Organic Chemistry |
| The study of the substances which are chemical combinations of elements other than carbon. | Inorganic Chemistry |
| The branch of chemistry concerned with living things. | Biochemistry |
| The study of substances that are present in materials and how much of each substance is present. | Analytical Chemistry |
| A collection of compatible, related units that can be used to measure such quantities as length, mass or weight or volume. | System of Measurement |
| The force of gravity. | Weight |
| The quantity of matter. | Mass |
| Defined as mass per unit volume of a substance. | Density |
| Consistency or reproducibility of a measurement. | Precision |
| How close a measurement is to the actual, exact value. | Accuracy |
| Definite shape and volume. | Solid |
| The smallest particle of an element that retains the characteristics of the element. | Atom |
| The temperature at which a liquid is changed into a gas. | Boiling Point |
| A substance which can be broken down by chemical means into simpler substances. | Compound |
| A substance which cannot be broken down into simpler means by ordinary chemical means. | Element |
| A reaction in which the products have a higher heat energy content than the reactants. | Endothermic Reaction |
| A quantity described as the randomness of a substance of system. | Entropy |
| A reaction in which the products have a lower heat energy content than the reactants. | Exothermic Reaction |
| A grouping of elemental symbols which tells not only what types of atoms compose the compound but also the number of each type of atom in one molecule of the compound. | Formula |
| A matter that has particles that are far apart and has no definite shape or volume. | Gas |
| The energy possessed by matter due to its motion. | Kinetic Energy |
| The law where energy is neither created nor destroyed in chemical or physical ways. | Law of Conservation of energy |
| The law where matter and energy can neither be created nor destroyed, only changed from one form to another. | Law of Conservation of mass-energy |
| The law where the ratios of the masses of each element in a given compound are always the same. | Law of Definite Composition |
| The law where two elements can combine to form more than one compound, the masses of one element that combine with a fixed amount of the other element are in a ratio of small whole numbers. | Law of Multiple Proportions |
| A state of matter where particles are close together but have no definite shape. | Liquid |
| A measure of the quantity of matter in an object. | Mass |
| Two or more elements or compounds that are physically mixed. | Mixture |
| A group of two or more atoms that are linked together by chemical bonds. | Molecule |
| The law where every system to itself will tend toward a condition of maximum entropy or disorder. | Second law of Thermodynamics |
| A matter that is homogenous, of definite composition, and has its own unique properties which make it different from every other substance. | Substance |
| A negatively charged ion. | Anion |
| The average mass of the atoms of an element in their naturally occurring abundances, relative to the carbon-12 isotope. | Atomic mass |
| One twelfth the mass of an atom of the isotope. | Atomic mass unit |
| The number of protons in the nucleus. | Atomic number |
| The negative charged ray. | Cathode ray |
| A positive charge ion. | Cation |
| A change in which one substance becomes another substance. | Chemical change |
| A technique used to separate components. | Chromatography |
| The process of purifying a liquid solution by boiling it and collecting the vapor. | Distillation |
| Negative charged subatomic particle. | Electron |
| The process of separating mixtures by taking advantage of their differing solubilities in a given solvent. | Fractional crystallization |
| An atom or molecule that is electrically charged because it has a different number of electrons than protons. | Ion |
| Atoms of the same element that differ in their mass numbers. | Isotopes |
| The sum of the number of protons and number of neutrons. | Mass number |
| An instrument that measures the isotopes in an element. | Mass spectrometer |
| A record of the distribution of particles in a sample mass. | Mass Spectrum |
| A subatomic particle that has no charge. | Neutron |
| The small,dense, central part of an atom containing all the positive charge. | Nucleus |
| A change in physical appearance but not chemically. | Physical Change!!!!!!!!!!!! |
| Characteristics by which one type of matter may be described, identified, or distinguished from type. | Properties. |
| A positive charge subatomic particle. | Proton |
| Subatomic particles of which protons, neutrons, and certain other particles are thought to be composed. | Quarks |
| Value of 6.022 x 10 to 23rd | Avogrados's number |
| A symbolic representation which specifies the elements present in a compound as well as the relative or actual numbers of atoms each element present. | Chemical formula |
| A type of chemical formula that shows only the simplest ratio of atoms in a compound. | Empirical formula |
| The simplest ratio of atoms in a molecule. | Formula Unit |
| The mass in grams of one mole of a substance. | Molar mass |
| The amount of a substance containing the same numbers of particles as exactly 12g of carbon 12 | Mole |
| The formula of an actual molecule, used to represent molecular compounds. | Molecular Formula |
| The smallest particle of pure substance. | Molecule |
| Quantitative relationships between substances involved in chemical equations. | Stoichiometry |
| Lowest possible temperature. | Absolute ZERO |
| The law where equal volumes of gases at the same temperature and pressure contain equal numbers of molecules. | Avogadro Law |
| The law where volume of a given mass of a gas at constant pressure is directly proportional to the absolute temperature. | Charles law |
| The law where volume of a given mass of a gas at constant temperature is inversely proportional to the pressure. | Boyle law |
| The process in which a gas uniformly spreads throughout a larger volume by random movement and collisions. | Diffusion |
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