1 - JustAnswer
1.
A system absorbs 159 kJ of heat, and performs 89 kJ of work on the surroundings. What is ΔΕ of the system?
[pic]C) 70 kJ
2.
A 1.0 kg block of ice, at 0.0 Celsius is added to a picnic cooler. How much heat will the ice removes as it melts into water at 0.0 Celsius?
[pic]A) 80.00 kcal
3.
On a hot Kansas day the mercury can really rise. A couple of days ago the thermometer read 98oF, what would a Kelvin thermometer have read?
[pic]C) 310 K
4.
Express 3.27x105J in kilocalories.
[pic]C) 78.2 kcal
5.
How much energy will be needed to heat 69.7 gal of water from 22.0°C to 110.0°C? (Note that 1.00 gal weighs 3.77 kg and that water has a specific heat capacity of 4.184 J/g•°C.)
[pic]E) 9.67x104kJ
6.
Consider the following standard heats of formation:
H3PO4(s) = -1279 kJ/mol
P4O10(s) = -3110 kJ/mol
H2O(l) = -286 kJ/mol
Calculate the change in enthalpy for the following process:
4H3PO4(s) → P4O10(s) + 6H2O(l)
[pic]B) –290 kJ
7.
True or false? Enthalpy is not a state function.
[pic]B) False
8.
Heat transfer from one solid to another takes place via?
[pic]D) B and C
9.
Heat is typically measured in
[pic]C) joules
10.
____ is a measure of disorder or randomness.
[pic]A) Entropy
11.
On the Celsius scale
[pic]C) the numbers are set by the freezing and boiling point of water
12.
Which of the following processes is endothermic?
[pic]D) freezing water to make ice cubes
13.
True or false? The law of conservation of energy states that energy can be converted from one form to another but can be neither created nor destroyed.
[pic]A) True
14.
The specific heat capacity of iron is 0.45 J/g•°C. How many joules of energy are needed to warm 1.31 g of iron from 20.00°C to 29.00°C?
[pic]E) 5.3 J
15.
561.2 J of heat was added to 8.00 g of water. The final temperature of the water was measured to be 64.2°C. What was the initial temperature of the water? (specific heat capacity of water = 4.184 J/g°C)
[pic]C) 47.4°C
16.
Consider the following reaction:
ClF + F2 → ClF3 ΔH = -108.7 kJ/mol
Is the reaction exothermic or endothermic?
[pic]A) exothermic
17.
Perform the indicated conversion: 1.345 kcal ( ____ J
[pic]A) 5.627x103 J
18.
In the equationΔE = q + w , the q represents
[pic]E) heat
19.
Consider the following standard heats of formation:
CO2(g) = -393.5 kJ/mol
PbO(s) = -151.6 kJ/mol
CO(g) = -110.5 kJ/mol
Calculate the change in enthalpy for the following process:
Pb(s) + CO2(g) → PbO(s) + CO(g)
[pic]D) –131.4 kJ
20.
For the reaction
H2(g) + 1/2 O2(g) → H2O(l) ΔH = -286 kJ/mol
Calculate the enthalpy change when 4.73 g of hydrogen gas is reacted with excess oxygen.
[pic]C) –671 kJ
1.
How many electrons are in the third principal energy level (n = 3) of one atom of cobalt?
[pic]A) 15
2.
The energy levels of the hydrogen atom (and all atoms) are ____, meaning that only certain discrete energy levels are allowed.
[pic]A) quantized
3.
Where could an electron be located in the representation above?
[pic]A) A
[pic]B) B
[pic]C) C
[pic]D) D
[pic]E) Any of these
4.
The electron configuration for the sulfur atom is
[pic]E) none of these (1s22s22p63s22p4)
5.
True or false? The p block of elements contains the transition metals.
[pic]A) True
6.
The form of EMR (electromagnetic radiation) that has more energy per photon than ultraviolet rays but less energy per photon than gamma rays is
[pic]C) X rays
7.
What element has the electron configuration 1s22s22p63s23p6?
[pic]C) Ar
8.
When an electron in the ground state absorbs energy, it goes to a(n) ____ state.
[pic]A) excited
9.
How many d electrons are in an atom of cobalt?
[pic]A) 7
10.
The elements chlorine and iodine have similar chemical properties because they
[pic]B) are in the same chemical period
11.
A given set of d orbitals consists of ____ orbital(s).
[pic]C) 5
12.
True or false? The frequency of the wave indicates how many wave peaks pass a certain point per given time period.
[pic]A) True
13.
The number of d orbitals in the second principal energy level is
[pic]E) none of these (0)
14.
True or false? The speed of a wave indicates how fast a given peak travels through the medium.
[pic]A) True
15.
1s22s22p63s23p64s23d7 is the electron configuration for which of the following atoms?
[pic]A) Co
16.
Which of the following is the highest energy orbital for a silicon atom?
[pic]D) 3p
17.
The form of EMR that has less energy per photon than infrared rays but more energy per photon than radio waves is
[pic]A) microwaves
18.
True or false? The 47th electron of silver, Ag, will be in a d orbital
[pic]B) False (it is in 5s)
19.
The maximum number of electrons in the second principal energy level of an atom is
[pic]C) 8
20.
As the principal energy level increases in an atom's orbitals, the average distance of an electron energy level from the nucleus ____.
[pic]A) increases
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