What word defines as "energy available to do work"?
a. activated complex
b. reaction rate
c. inhibitor
d. activation energy
e. free energy
What is free energy
100
What word defines as "a reaction that releases free energy"?
a. spontaneous reaction
b. entropy
c. chemical equilibrium
d. reaction mechanism
e. elementary reaction
What is spontaneous reaction
100
What word defines as "the measure of disorder"?
a. spontaneous reaction
b. entropy
c. chemical equilibrium
d. reaction mechanism
e. elementary reaction
What is entropy
100
A process that absorbs heat is a(n)
a. endothermic process
b. polythermic process
c. exothermic process
d. ectothermic process
What is endothermic process
100
The amount of heat released by the complete burning of 1 mole of a substance is the
a. specific heat
b. heat of combustion
c. heat capacity
d. heat of fusion
What is heat of combustion
200
When an acid reacts with a base, what compounds are formed?
a. a salt only
b. water only
c. metal oxides only
d. a salt and water
What is a salt and water
200
What is the formula for phosphoric acid?
a. H2PO3
b. H3PO4
c. HPO2
d. HPO4
What is H3PO4
200
Which of the following is a property of an acid?
a. sour taste
b. nonelectrolyte
c. strong color
d. unreactive
What is sour taste
200
What is a property of a base?
a. bitter taste
b. watery feel
c. strong color
d. unreactive
What is bitter taste
200
Which hydroxide compound yields the lowest concentration of hydroxide ions in aqueous solution?
a. sodium hydroxide
b. potassium hydroxide
c. calcium hydroxide
d. magnesium hydroxide
What is magnesium hydroxide
300
The combined gas law relates which of the following?
a. pressure and volume only
b. temperature and pressure only
c. volume and temperature only
d. temperature, pressure, and volume
What is temperature, pressure, and volume
300
What does the ideal gas law allow a scientist to calculate that the other gas laws do not?
a. number of moles
b. pressure
c. volume
d. temperature
What is number of moles
300
Which states of matter can flow?
a. gases only
b. liquids only
c. gases and liquids only
d. gases, liquids, and solids
What is gases and liquids only
300
Which of the following best describes the motion of the particles in a piece of steel?
a. none are moving
b. a few are moving
c. all are moving
d. most are moving
What is a few are moving
300
As the temperature of the gas in a balloon decreases, which of the following occurs?
a. the volume of the balloon increases
b. the average kinetic energy of the gas decreases
c. the gas pressure inside the balloon increases
d. all the above
What is the average kinetic energy of the gas decreases
400
Calculate the number of moles of Al2O3 that are produced when 0.06 mol of Fe is produced in the following reaction:
2Al(s) + 3FeO(s) -> 3Fe(s) + Al2O3(s)
a. 0.20 mol c. 0.60 mol
b. 0.40 mol d. 0.90 mol
What is 0.60 mol
400
What is the approximate molar mass of a molecular solute if 300g of the solute in 1000g of water causes the solution to have a boiling point of 101 degrees C (Kb= 0.512 degrees C/m; Kf= 1.86 degrees C/m; molar mass of water= 18g)
a. 15 amu b. 30 amu c. 150 amu d. 300 amu
What is 150 amu
400
What is the solubility of silver nitrate if only 11.1g can dissolve in 5.0g of water at 20 degrees C?
a. 2.2g/100g H2O at 20 degrees C
b. 45g/100g H2O at 20 degrees C
c. 22.2g/100g H2O at 20 degrees C
d. 222g/100g H2O at 20 degrees C
What is 222g/100g H2O at 20 degrees C
400
Which of the following expression is generally used for solubility?
a. grams of solute per 100 grams of solvent
b. grams of solute per 100 milliliters of solvent
c. grams of solute per 100 gram of solution
d. grams of solute per milliliters of solution
What is grams of solute per milliliters of solution
400
How many mL of a 2.0M NaBr solution are needed to make 200.0mL of 0.50M NaBr?
a. 25mL
b. 50mL
c. 100mL
d. 150mL
What is 50mL
500
How many milliliters of alcohol are in 167mL of an 85.0% (v/v) alcohol solution?
a. 252mL
b. 228mL
c. 145mL
d. 142mL
What is 142mL
500
Lead nitrate can be decomposed by heating. What is the percent yield of the decomposition reaction if 9.9g Pb(NO3)2 are heated to give 5.5g of PbO?
2Pb(NO3)2(s) -> 2PbO(s) + 4NO2(g) + O2(g)
a. 44% c. 67%
b. 56% d. 82%
What is 82%
500
In a particular reaction between copper metal and silver nitrate, 12.7g Cu produce 38.1g Ag. What is the percent yield of silver in this reaction?
Cu + 2AgNO3 -> Cu(NO3)2 + 2Ag
a. 56.7% c. 88.2%
b. 77.3% d. 176%
What is 88.2%
500
Calculate the number of moles of aluminum oxide that are produced when 0.60 mol of iron is produced in the following unbalanced reaction.
Al(s) + FeO(s) -> Fe(s) + Al2O3(s)
What is 0.2 mol Al2O3
500
Hydrogen gas can be produced by reacting aluminum with sulfuric acid. A) How many moles of sulfuric acid are needded to completely react with 15.0 mol of aluminum? B) How many grams of aluminum sulfate will be produced if 250g sulfuric acid completely reacted with aluminum?