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Flashcards in Practice Test 1 Deck (16):
1

If 1 mole of H2 and 1 mole of O2 are mixed and allowed to react according to the equation 2H2 +O2 -> 2H2O, The max number of moles of H2O that could be produced is?

1

2

For the equilibrium (NH4)3PO4 -> 3NH4+ +PO4^-3, the solubility product expression Ksp is

[NH4+]^3 [PO4 ^-3]

3

Which of the following compounds contains 42% chlorine and 57% Oxygen by weight?
a. HCl
b. HClO
c. ClO2
d. HClO3
e. HClO4

HClO3

4

When empty, the mass of a beaker is 115g. When filled with 300 mL of an unknown liquid, the combined mass is 427g. What Volume in mL would 1 Kg of the liquid occupy?

(300)(1000)/(427-115)

5

Which of the following is NOT a good conductor of electricity?
a. Fe(S)
b. NaCl (aq)
c. NaCl (l)
d. NaCl (s)
e. Cu (s)

NaCl (s)

Aq solution of Nacl is a superb conductor of electricity; ionic solutions are well known conductors.
The molten form will also be a good conductor.
Only the solid form will be an insulator.

6

A solution of sulfuric acid has a concentration of 18M. What Volume of water would be needed to dilute 25mL of this H2SO4 solution to 3M

125mL

7

Which of the following processes is accompanied by an increase in entropy?
a. Organization of groceries by food group in a refrigerator.
b. Filtration of of a solid from a liquid suspension.
c. Condensation of water.
d. Evaporation of rubbing alcohol.
e. Deposition of carbon dioxide.

d. Evaporation of rubbing alcohol.

2nd law of thermodynamics: In a real, spontaneous process the entropy of the universe must increase.
Think of entropy as disorder or randomness & it is helpful to keep a few typical entropically-favored processes in mind:
boiling, sublimation, melting and mixing.

8

Describe Ionic character.

bond between two atoms of large electronegative difference

9

What is le Chartie Principle?

When a system is in equilibrium, any stress applied to it will cause the equilibrium to shift in a direction that alleviates the stress.

10

the electronic configuration of a particular neutral atom is 1s2 2s2 2p6 3s2 3p6 3d6 4s2. The number of unpaired electrons in this atom is

4

11

what is the product of an oxygen nucleus with 9 electrons that undergo alpha-decay?

13C6

12

What increases down a column in the periodic table?

Atomic radius

13

why does raising the temperature cause an increase in the rate of a chemical reaction?

A greater proportion of the reactants has sufficient kinetic energy to overcome the activation barrier.

14

Whats the electronic configuration of Mn^2+

[Ar]3d^5

15

Describe the thermodynamic and electrochemical properties of a battery?

negative gibbs free energy; spontaneous; oxidation at anode.

16

the pH solution of NNO3 is 3. what is the hydrogen ion concentration?

10^-3M