CHEM 1360 EXAM 2

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Ca + 2 H2O -> Ca(OH)2 + H2 and 2 LiOH +CO2 -> Li2CO3 are...: balanced
4 BF3 + 3 H2O -> H3BO3 + 3 HBF4 and 6 NaOH + 3 Cl2 -> 5 NaCl + NaClO3 + 3 H2O are...: balanced
When Ca(OH)2 + H3PO4 -> H2O + Ca3(PO4)2 is balanced, how many molecules of water will be produced for each molecule of phosphoric acid?: 3
When Ca(OH)2 + H3PO4 -> H2O + Ca3(PO4)2 is balanced, how many molecules of phosphoric acid are consumed for each formula unit of calcium phosphate produced?: 2
When Ca(OH)2 + H3PO4 -> H2O + Ca3(PO4)2 is balanced, how many formula units of calcium hydroxide will be consumed if six molecules of phosphoric acid react?: 9
In the reaction 2 H2(g) + 2 H20(g), with all substances at the same temperature and pressure, the combining ratios by volume, for H2, O2, and H2O, respectively, are?: 2:1:2
How many molecules of carbon dioxide are produced in the following reaction when 50 molecules of O2 are consumed? 2 C8H18(I) + 25 O2(g) -> 16 CO2(g) + 18 H2O(I): 32 molecules
In the reaction N2(g) + 3 H2(g) -> 2 NH3(g), with all substances at the same temperature and pressure, what volume of ammonia would be produced when 4.50 L of nitrogen reacts with excess hydrogen?: 9.00 L
How many carbon-12 atoms are there in a mass of exactly 12 g of carbon-12?: 6.02 X 10^23
The mass of 1 mol of carbon-12 atoms is?: 12 g
How many hydrogen atoms are in one formula unit of (NH4)2HPO4?: 9
Which of the following has the smallest molecular mass? CH4, HF, H2O, NH3: CH4
What is the total number of moles of sulfur atoms in 1 mol of Fe2(SO4)3?: 3
How many moles of hydrogen atoms are present in 2.00 moles of ammonia (NH3)?: 6.00 mol
The mass of 4.75 moles of H2SO4 is?: 466 g
A 10.0-g sample of which of the following would have the most moles? Cu, Fe, Si, S: Si
How many moles of CO2 are there in 1 lb (453.6g) of CO2?: 10.3 mol
At the molar level, 2 H2 + O2 -> 2 H20 means that..: 2 mol H2 reacts with 1 mol O2 to form 2 mol H2O
How many moles of water can be formed from 0.500 mol H2?: 0.500 mol
How many moles of oxygen are required to form 0.222 mol H2O?: 0.111 mol
In a solution of 85.0 g of water and 5.0 g of sucrose (C12H22O11), the...: solute is sucrose and the solvent is water
What is the molarity of a sodium hydroxide solution having 0.500 mol NaOH in 250 mL of solution?: 2.00 M
How many moles of sugar are required to make 4.00 L of a saturated solution of sugar having a concentration of 0.600 mol/L?: 2.40 mol
What mass of NaCl in grams is needed to prepare 2.500 L of a 0.800 M NaCl solution?: 117 g
What volume of 6.00 M HCl solution is needed to proved 1.50 mol of HCl?: 250 mL
What is the percent by volume of ethanol in a solution made by adding 50.0 mL of pure ethanol to enough water to make 250 mL of solution?: 20.0% ethanol
A solution contains 15.0 g of sucrose and 60.0 g of water. What is the percent by mass of the sucrose solution?: 20.0% sucrose
What volume of water should be added to 23.4 g of NaCl to make 100.0 mL of 4.00 M solution?: enough to make 100.0 mL of solution
Molecules are farthest apart in a?: gas
Liquids are?: difficult to compress and have no definite shape
When a gas changes into a liquid, the process is called?: condensation
When a liquid changes into a solid, the process is called?: freezing
When a solid changes directly into a gas, the process is called?: sublimation
What is not composed of particles that exhibit intermolecular forces?: NaBr
What is likely to require the most energy input to melt it?: KCl
What intermolecular forces are most significant in accounting for the high boiling point of liquid water relative to other substances of similar molecular weight?: hydrogen bonding
What has the strongest interaction?: covalent bond
In ethanol, the attractions between neighboring molecules are?: hydrogen bonds and dispersion forces only
The molecules of liquid water in a beaker are held to each other by?: intermolecular forces
Which of the compounds, CH3OH, H2, HF, and H2O, can form hydrogen bonds?: CH3OH, HF, and H2O
What molecule does not form hydrogen bonds?: chloroform, CHCl3
A solution is a mixture that is?: homogeneous
What pair of substances is least likely to form a solution?: an ionic compound in a nonpolar solvent
A positive test for iodine is a purple solution of I2 in hexane (C6H14). What type of solute-solvent interaction is most important in a solution of nonpolar I2 in nonpolar C6H14?: dispersion-dispersion
What type of solute-solvent interaction is most important in a solution of calcium chloride (CaCl2) in water?: ion-hydrogen bond
What type of solute-solvent interaction is most important in a solution of ethanol (CH3CH2OH) in water?: hydrogen bond-hydrogen bond
What solutes will disolve in octane, C8H18, a component of gasoline?: CH3(CH2)4CH3
What is not a postulate of the kinetic-molecular theory of gases?: The pressure and volume of a gas are inversely related
According to the kinetic-molecular theory of gases, a gas particle...: has a volume that is negligible compared to the volume occupied by the gas
In collisions between ideal gas molecules, the total energy of the gas...: remains the same
Gas pressured is caused by?: gas molecules colliding with vessel walls
Boyle's law states that the pressure of a gas is inversely proportional to its?: volume
A gas occupies 4.00 L at 2.00 atm pressure. At what pressure would the volume be 6.00 L if the temperature remains constant?: 1.33 atm
When the temperature is changed at constant pressure, the volume of a gas is halved. How is the new temperature related to the original temperature?: the Kelvin temperature is halved
One 1-L flask (Flask A) contains carbon monoxide gas and another identical flask (Flask B) contains carbon dioxide gas, both at STP. Flask A has...: less mass but the same number of particles as Flask B
How many moles are present in 5.60 L of a gas at STP?: 0.250 mol
In the ideal gas equation PV=nRT, the variable n stands for?: number of moles
At STP 1.00 mol of an ideal gas occupies 22.4 L. What volume does the gas occupy at 20 degrees C and 1.00 atm?: 24.0 L
The molar volume of an ideal gas at 2.00 atm and 546 K is?: 22.4 L
V.S.E.P.R. stands for what and what does it mean?: valence shell electron pair repulsion. a theory of chemical bonding useful in determining the shapes of molecules. basically two pair equals linear, three pair equals triangular, four pair equals tetrahedral

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Created By danielleroach