UD Chem 103 Exam 1 Questions And Correct Verified Answers Graded A+.

COAST - correct answer Collect Organize Analyze Solve Think about it Physical Property - correct answer A property that can be observed without change Chemical Property - correct answer A property that can be observed by reacting and forming another substance Intensive - correct answer Independent; does not depend on amount Extensive - correct answer Depends on amount Pure Substance - correct answer Same chemical and physical properties throughout. Cannot be separated with physical process Mixture - correct answer Contains 2 or more substances. Can be separated with physical process Diatomic Elements - correct answer H,O,N,Cl,Br,I,F Homogeneous Mixture - correct answer Solutions, uniform distribution, no boundaries Heterogeneous Mixture - correct answer Uneven distribution, regions of unevendistribution Density - correct answer D = M/V Intensive property Democritus' Atomic Reasoning - correct answer Clay cut in half repeatedly until the smallest substance was acheived. (The Atom) Dalton's Atomic Theory - correct answer - All matter consists of atoms - Atoms cannot be subdivided* - Atoms are identical within the same element* - Compounds result from the chemical combo of a specific ratio *not true Thompson's Experiment - correct answer Charged ray beamed through magnetic field Experiment findings: - Ray consists of charged particles found in all matter Rutherford's Experiment - correct answer Positively charged beam shot through gold foil Experiment findings: Positive rays went through, some blocked by nucleus Nucleus - correct answer Protons & Neutrons Protons - correct answer Positively charged particles Neutrons - correct answer Electrically neutral particles 4/2 HE - correct answer 4: Mass Number (protons+neutrons) 2: Atomic Number (protons) Atomic Mass Unit - correct answer AMU Unit used to express the relative masses of atoms and subatomic particles Isotope - correct answer Atoms of an element containing the same number of protons but different number of neutrons Natural Abundance - correct answer Proportion of a particular isotope Cation - correct answer Positive charged ion, losing electrons Anion - correct answer Negatively charged ion, gaining electrons Ionic Compunds - correct answer - Consists of charged particles - Held together by electrostatic forces Formula Units - correct answer Smallest electrically neutral unit of an ionic compund Molecular Compund - correct answer Atoms held by covalent bonds Covalent bonds - correct answer Atoms held together by sharing electrons Polyatomic Ions - correct answer 2 or more atoms joined by covalent bonds The Mole - correct answer The standard unit for expressing macroscopic quantities (atoms or molecules) Molar Mass - correct answer The mass of one male of an element Empirical Formula - correct answer Represents the lowest possible whole number ratio of elements in a molecule Molecular Formula - correct answer The actual ratio of elements in a compound Combustion Reaction - correct answer An explosive reaction of a compound of oxygen Natural Gas - correct answer A mixture of light hydrocarbon composed mostly of methane Hydrate - correct answer A compound that contains a water molecule combined in a definite ratio as an integral part of the crystal Limiting Reagent/Reactant - correct answer A substance that is completely consumed in the reaction Solvent - correct answer A component of a solution that is present in a large amount Solute - correct answer A compound of a solution that is present in a small amount Concentration - correct answer Amt. solute / amt. solution Molarity - correct answer Moles of solute / liters of solution Stock Solution - correct answer a concentrated solution of a substance used to prepare solutions of lower concentration Solubility - correct answer The ability of a solute to dissolve in a certain solvent Precipitate - correct answer - Solid product formed from a reaction in solution - Insoluble cation + insoluble anion Strong Electrolytes - correct answer - Conducts electricity well Nonelectrolytes - correct answer - Substances that dissolve with no ionization - No conduction of electrical current Double Displacement - correct answer AY = BX - AX + BY Single Displacement - correct answer A + BX - B + AX