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100
How many protons and electrons are in 64 Cu 2+ ion?
29 protons, 27 electrons
100
A gas under a pressure of 74 mmHg and at a temperature of 75 degrees Celsius occupies a 500-L container. How many moles of gas are in the container?
1.7 moles
100
What substance can act as either an acid or a base according to the Bronsted-Lowery definition?
HOH
100
The half-life of phosphorus-32 is 14.3 days. How much of a sample of phosphorus-32 will remain after 57.2 days?
1/16
100
By adding a small amount of "accelerant" is it reasonable to think of this accelerant as being a catalyst?
No, the accelerant is used up during the reaction
200
If two oxygen atoms combine to make a molecule, what type of bond will they form?
A double covalent bond
200
What is the volume of 2.00 moles of a nitrogen gas at STP?
56.0 L
200
What is the correct chemical formula for sodium sulfate?
Na2SO4
200
To increase the temperature of 100 g of H2O from -50 degrees Celsius to -10 degrees Celsius, how much energy is required?
8.20 x 10 ^3 J
200
The equation A + B => C + D is first order in A and first order in B. If the rate constant for this reaction is 3,450/M,sec, what will the rate of this reaction be when the concentration of Q is 0.50 M and the concentration of B is 0.25 M?
r = 431.25 M/sec
300
What is the name of the compound with the chemical formula CrCl3?
Chromium(III) chloride
300
In an experiment, 2.62 g of iron react completely with 1.50 g of sulfur. What is the empirical formula for the compound produced?
FeS
300
Which element is located in Group 2 (IIA) and Period 6 of the periodic table?
Barium (Ba)
300
What is the boiling point of a solution is which 22.5 g of sucrose is dissolved in 550 mL of water?
100.06
300
Explain london dispersion
Weakest force. Atoms form temporary dipoles
400
How does an S 2- ion differ from an electrically neutral sulfur atom?
Number of electrons
400
What do the ions K+, Ca2+, and Cl- have in common?
They have the same electron configuration as argon
400
Which is a characteristic of a strong acid?
Completely ionizes in a solution
400
Explain why the addition of a solute decreases the melting point of a liquid?
Intermolecular forces become less strong and interrupted
400
Explain dipole - dipole
attractive forces between the + end of the one polar molecule and the - end of another polar molecule
500
Why did most of the alpha particles go straight through the gold foil in Rutherford's experiment?
Most of an atom is empty space
500
Neutralization occurs when 15.0 mL of KOH react with 25.0 mL of HNO3. If the molarity of HNO3 is .750 M, what is the molarity of KOH?
1.25 M
500
Which on of these is soluble in water? A. aluminum sulfide B. calcium carbonate C. iron(III) hydroxide D. potassium sulfate
potassium sulfate
500
Find the pH of a 0.065 M solution of formic acid. THe acid dissociation constant for formic acid is 1.8 x 10 ^-4
pH = 2.5
500
Explain hydrogen bonding
Strongest force