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Chem Final
FCA Chemistry Final
Question | Answer |
---|---|
mr. misko put 54g of whiter into a beaker. how many moles of water did he place in the beaker? | 3.0 mol |
a 2.000 mol sample of acetic acid has a mass of how many grams (acetic acid is CH3COOH) | 120g |
the mole is a unit of | quantity |
avogadro's number represents the number of _____ in a _____ | particles; mole |
what is accuracy? | is a measure of how close a value is to the true value |
what is precision? | is a measure of how close a series of value are to each other |
which is a physical property? | mass, electrical conductivity, boiling point (NOT heat of combustion) |
which is an intensive property? | density, melting point, malleability (NOT volume) |
which is a pure substance? | diamonds, iron (III) sulfate, distilled water (NOT milk) |
which is a type of mixture? | solution, suspension, colloid (NOT isotope) |
how many protons, neutrons, & electrons does the isotope of carbon known as Carbon-14 have | 6-proton, 8-neutrons, 6-electrons |
the atomic number of carbon is | 6 and equals the number of protons |
the scientist antoine lavoisier is known as the father of modern chemistry. one of his major accomplishments was to ________ | write a book on chemical nomenclature |
who said: "by convention sweet, by convention bitter, by convention hot, by convention cold, by convention color: but in reality atoms and void" | democritus |
who is credited for making the periodic table of the elements? | dmitri mendeleev |
which group of the periodic table contains highly reactive elements that all form cations? | alkali metals |
which group of the periodic table all form negative one anions? | halogens |
which group of the periodic table contains elements that are fairly reactive and all form positive two cations? | alkaline earth metals |
which group of the periodic table contains elements that are very stable and unreactive? | noble gases |
what is the measure of the ability of an atom to attract electrons in a molecule | electronegativity |
what is the most electronegative element? | fluorine |
a bond that results from the electrostatic attraction between oppositely charged particles is | ionic bond |
a bond that results from the sharing of valence electrons is | covalent bond |
a bond that exists when electrons are delocalized and have an electrostatic attraction for the nuclei of different atoms called | a metallic bond |
a pi bond is formed from the sharing of electrons between what types of orbitals? | p orbitals |
according to VSEPR theory, what is the geometry of methane? | tetrahedral |
according to VSEPR theory, what is the geometry of water? | bent |
according to VSEPR theory, what is the geometry of carbon dioxide? | linear |
what is an intermolecular force of attraction between 2 polar molecules | dipole-dipole |
the intermolecular force that results from the synchronized movement of electrons in non-polar molecules | london dispersion forces |
the intermolecular forces that exist between ethanol molecules are somewhat weaker than those that exist between water molecules, consequently: | water has a higher boiling point because it is harder for molecules to leave the liquid phase |
nitrogen dioxide has the formula: | NO2 |
iron (III) sulfate has the formula: | Fe2(SO4)3 |
what is KBr? | potassium bromide |
ammonium nitrate has the formula: | NH4NO3 |
hydroxide has a charge of | positive 1 |
NaOH + CaCl2 -> NaCl + Ca(OH)2 is what type of reaction? | double displacement |
C8H18 + O2 -> H2O + CO2 + heat is what type of reaction? | combustion |
the ability of a substance to resist flowing | viscosity |
the intermolecular force of attraction between particles of the same substance | cohesion |
a solid whose particles are arranged in a random manner | an amorphous solid |
graphite & diamond are examples of 2 | allotropes of an element |
all matter is made up of tiny particles called atoms, ions, or molecules, particle motion -- particle motion is least in solids, greater in liquids, and greatest in gases -- particles in motion possess kinetic energy, which is greatest in gases --these r? | tenants of the kinetic molecular theory |
the process of a gas becoming a liquid is called | condensation |
the process of a solid becoming a gas is called | sublimation |
how much energy is required to completely melt a 36g sample of ice (solid water) that has just previously warmed up to 0.00 degrees celsius | 12KJ |
how much energy is required to completely melt a 36g sample of water that was initially at -25 degrees celsius? | 14KJ |
how much energy is required to heat a 36.0g sample of solid water from -25.0 degrees celsius to 50.0 degrees celsius? | 21.4KJ |
a plastic water bottle with an initial volume of .50L and a pressure of 1.0atm is crushed to .20L. what is the new pressure | 2.5atm |
a balloon with a volume of 1.5L at 298K is slowly heated to 400K. what is the new pressure | 2.0L |
A gas takes up a volume of 20.0L, has a pressure of 1.00atm, and a temperature of 298K. if the temperature was increases to 352K and the pressure was dropped to .500atm, what is the new volume? | 47.2L |
how many moles of gas are present in a 2.9L container at 1.0 atm and 298K? | .12mol |
the component that is dissolved into a solvent in order to form a solution | solute |
any substance that ionizes into cations and anions when dissolved | electrolyte |
a substance that only partially ionizes when dissolved in a solution | weak electrolyte |
liquids that are not soluble in one another/ not able to be mixed | immiscible |
a solution that has reached the equilibrium where the rate of dissolution = the rate of recrystallization | saturated solution (supersaturated- saturated to the maximum) |
a unit for concentration that expresses the number of moles of solute per leader of solution | molality |
a unit for concentration that expresses the number of moles of solute per liter of solution | molarity |
any substance that increases the concentration of hydrogen ions in aqueous solution | arrhenius acid |
any substance that increases the concentration of hydroxide ions in aqueous solution | arrhenius base |
proton donor | bronsted-lowry acid |
proton acceptor | bronsted-lowry base |
formed when bronzed lowry base accepts a proton | conjugate acid |
remains after a bronzed-lowry acid donates a proton | conjugate base |
a substance that can be either an acid or base | amphoteric |
acid that can only date one proton | monoprotic acid |
an acid that ionized when dissolved in solution | strong acid |
the point in a titration where the number of moles of the substance being titrated equals the number of moles of acid/base added | equivalence point |
the rule of polarity in solubility. only positives with positives and negatives with negatives | like dissolves like |
unsaturated | less than saturated |
are properties that depend on concentration of solute but not on the identity of the solute. explains why rock salt melts ice | colligative properties |
sour taste, change color of acid & base indicatiors, react with bases to form salt & water and feel slippery | properties of acids |
bitter taste, change color of acid/base indicators, react with bases to form salt & water, feel slippery | properties of bases |
provides a surface that makes correct collisions between reactants easier | a catalyst |
is a tool that is used in order to determine if a reaction will be spontaneous | gibbs free energy |
4 factors that influence reaction rates | surface area, concentration, temp, catalyst |
the energy required or releases during the chemical reaction of substances in their standard state | standard molar enthalpy of reaction |
a device used to measure the enthalpy of change fir a reaction | calorimeter |
a measure of the energy that is not able to do work | entropy |
the total amount of energy in a thermodynamic system | enthalpy |
the energy level that must be overcome by the reactants in a chemical reaction in order for the reaction to occur | activation energy |
a reaction in which the reactants are converted to products without the constant addition of energy from outside the thermodynamic system to sustain the reaction | spontaneous reaction |
one half the distance between the nuclei and the radius | atomic radii |
the energy required to remove an electron | ionization energy |
the ability of an element to attract the electrons of another element | electronegativity |
electrons in the highest energy level (outermost) | valence electrons |