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100
What is the formula of the bromate ion?
BrO3-
100
Has the greatest positional entropy? A) 1 mole of O2(g) at 2.0 atm and 273 K B) 1 mole of O2(g) at 2.0 atm and 200 K C) 1 mole of O2(s) at 15 K D) 1 mole of O2(g) at 0.5 atm and 273 K E) 1 mole of O2(g) at 1.0 atm and 273 K
1 mole of O2(g) at 0.5 atm and 273 K
100
2.50 moles of nitrogen gas is placed in a closed 3.00 liter container at 25°C. If the temperature in the container is raised to 120°C, what will be the change in pressure?
What is 6.5 atm
100
What is the molar mass of glucose, C6H12O6?
What is 180.18 g
100
Which of the following particles has the greatest atomic radius? A) Al B) P C)Si D)Al3+ E) S
What is A) Al
200
What is the name of PCl3?
phosphorous trichloride
200
A two bulbed flask contains four particles. What is the probability of finding all four particles in only one of the bulbs?
What is 6.25 %
200
The mass of 2.37 liters of a gas is 8.91 grams. What is the density of the gas?
What is 3.76 g/L
200
How grams of oxygen are present in a 30.0 gram sample of potassium chlorate?
What is 11.8 grams
200
How many f orbitals have n = 3? A) 1 B) 0 C) 5 D)3 E)7
What is B) 0
300
What is the compound NaC2H3O2 called?
sodium acetate
300
Which of the following liquids is likely to have the highest value for S°? A) CH3OH B) C2H5OH C) N2H4 D) H2O
What is C2H5OH
300
A valve separates two tanks, one containing 7.6 liters of oxygen at 4.0 atmospheres and the other containing 4.0 liters of carbon dioxide at 11.0 atm. When the valve is opened and the two gases are allowed to come together, what is final pressure?
What is 6.4 atm
300
A 5.15 gram sample of a hydrocarbon is burned in oxygen, producing 15.6 grams of carbon dioxide and 8.45 grams of water. Assuming an excess of oxygen, what is the empirical formula of the hydrocarbon?
What is C3H8
300
How many electrons can fit in all of the orbitals in which n = 3? A)18 B)14 C)32 D)6 E)2
What is A) 18
400
A particle X contains 10 electrons, seven neutrons and has a net charge of 3-. The particle is:
a nitride ion
400
Which of these processes occurs with a decrease in entropy? A) Rusting of iron B) Decomposition of liquid water C) Combustion of methane D) Oxidation of glucose E) Melting of ice
What is the rusting of iron.
400
How big a volume of dry oxygen gas at STP would you need to take to get the same number of oxygen molecules as there are hydrogen molecules in 25.0 liters at 0.850 atm and 35°C
What is 18.8 L
400
For which of the following compounds does 0.400 mol have a mass of 12.8 grams? A) CH3OH B) CO2 C) CH4 D) CCl4 E) C4H10
What is A) CH3OH
400
Researchers at Lawrence Berkeley National Lab have recently formed a new synthetic element with atomic number 118 and mass number 293. Which of the following elements would have chemical properties most similar to this new element? A) Ta B) S C)Pb D)Ir E) Xe
What is E) Xe
500
The average mass of a magnesium atom is 24.31. If you were able to select and measure a single atom of magnesium, the chance that you would select an atom of mass 24.31 is about:
0%
500
Which of the following statements is true? ? A) Exothermic reactions are always spontaneous B) In a spontaneous process, Delta G has a positive value C) For a process to be spontaneous, moles of product exceed moles of reactant D) The entropy of the universe is increasing
What is D
500
How many moles of gas would it take to fill an average man's lungs, total capacity of which is about 4.5 liters? Assume 1.00 atm pressure and 37.0°C. A) 0.18 mole B) 1.24 mol C) 0.75 mol D) 37.0 mol E)11.2 mol
What is A) 0.18 mole
500
A mass of 21.5 grams of calcium hydroxide reacts with an excess of phosphoric acid. How many atoms of oxygen are found in the water produced in the reaction?
What is 3.49 x 1023 atoms
500
An element Z has the configuration [Xe]6s2. The oxide of this element will have the formula: A)ZO B)Z2O3 C)None of these D) ZO2 E) Z2O
What is A) ZO