What is a process that absorbs heat is a(n)
a. endothermic process
b. polythermic process
c. exothermic process
d. ectothermic process
a. endothermic process
100
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
d. a salt and water
100
Which states of matter can flow?
a. gases only
b. liquids only
c. gases and liquids only
d. gases, liquids, and solids
c. gases and liquids only
100
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
c. 0.60 mol
100
How many milliliters of alcohol are in 167mL of an 85.0% (v/v) alcohol solution?
a. 252mL
b. 228mL
c. 145mL
d. 142mL
d. 142mL
200
What is 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
b. heat of combustion
200
What is the formula for phosphoric acid?
a. H2PO3
b. H3PO4
c. HPO2
d. HPO4
b. H3PO4
200
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
b. a few are moving
200
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
c. 150 amu
200
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% 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%
d. 82%
300
What word defines as "energy available to do work"?
a. activated complex
b. reaction rate
c. inhibitor
d. activation energy
e. free energy
e. free energy
300
Which of the following is a property of an acid?
a. sour taste
b. nonelectrolyte
c. strong color
d. unreactive
a. sour taste
300
What is 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
d. temperature, pressure, and volume
300
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
d. 222g/100g H2O at 20 degrees C
300
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%
b. 77.3%
c. 88.2%
d. 176%
c. 88.2%
400
What word defines as "a reaction that releases free energy"?
a. spontaneous reaction
b. entropy
c. chemical equilibrium
d. reaction mechanism
e. elementary reaction
a. spontaneous reaction
400
What is a property of a base?
a. bitter taste
b. watery feel
c. strong color
d. uncreative
a. bitter taste
400
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
a. number of moles
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
d. grams of solute per milliliters of solution
400
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)
0.2 mol Al2O3*
500
What word defines as "the measure of disorder"?
a. spontaneous reaction
b. entropy
c. chemical equilibrium
d. reaction mechanism
e. elementary reaction
b. entropy
500
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
d. magnesium hydroxide
500
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
b. the average kinetic energy of the gas decreases
500
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
b. 50mL
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?