Chem 1010 - General Chemistry 1 » Fall 2021 » Quiz 3

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Question #1
Which of the following best completes the sentence: “The law of conservation of energy states that ….”
A.   molecules at a higher temperature are moving faster than at a lower temperature.
B.   the energy of the universe is constant.
C.   heat is a form of energy.
D.   heat transfers from a hot object to a cold object.
Question #2
Given the following reaction and enthalpy diagram, which of the following is true?   Fe2O3  +  2 Al  →  2 Fe  +  Al2O3
A.   The reaction is evothermic.
B.   The reaction is exothermic.
C.   The reaction is endothermic.
D.   None of the above is true
Question #3
How much energy is evolved during the reaction of 48.7 g of Al, according to the reaction below?  Assume that there is excess Fe2O3. Fe2O3(s) + 2 Al(s)  →  Al2O3(s) + 2 Fe(s)    ΔH = -852 kJ
A.   769 kJ
B.   241 kJ
C.   415 kJ
D.   207 kJ
Question #4
Describe the shape of an s orbital.
A.   ball
B.   two lobes
C.   four lobes
D.   two balls
Question #5
If a system has 25 J of work done on it and loses 12 J of heat, what is ∆E for the system?
A.   13 J
B.   – 37 J
C.   -13 J
D.   37 J
Question #6
How many kJ of energy are in 1.76 mol of 335 nm photons?
A.   629
B.   357
C.   3.57x105
D.   5.93x10-16
Question #7
Which of the following photons with the given wavelengths in a beam of light has the fastest speed?
A.   418 nm
B.   555 nm
C.   626 nm
D.   All their speeds are the same.
Question #8
If a photon has an energy of 4.10x10-19 J, what is the wavelength in nm?
A.   4.85x10-7
B.   485
C.   48.5
D.   4.85
Question #9
If a 20.0 g sample of Al having an initial temperature of 48.6 °C absorbs 427 J of heat, what is the final temperature? The specific heat capacity for Al is 0.902 J/g°C.
A.   72.3 °C
B.   74.8 °C
C.   53.6 °C
D.   23.7 °C
Question #10
Which of the following properties can be used to distinguish one substance from another substance?
A.   Specific Heat Capacity
B.   Temperature
C.   Enthalpy
D.   System Energy

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