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CHEM 110 PLQ-s PSU Altoona (1).
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CHEM 110 PLQ-s PSU Altoona (1).
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Perform the calculation to the correct number of significant figures: (20.505 x0.044)/2.0109 - CORRECT ANSWER-0.45
What is the mass of a sample of diamond that has a volume of 2.59 mL if the density
of diamond is 3.52 g/cm3? (A single diamond that weighs this much has an
estimated value of $200-$250 million). - CORRECT ANSWER-9.12 g
In Europe, car fuel efficiency is measured in km/L. What is the fuel economy in km/L
of a vehicle in the US that gets 50 miles per gallon. Assume 1 gallon = 3.785 L. -
CORRECT ANSWER-21 km/L
Which of the following are subatomic particles are contained by all atoms? (Choose
all that apply) - CORRECT ANSWER-1. Protons
2. Neutrons
3. Electrons
Which of the following defines an element? - CORRECT ANSWER-Protons
Which of the following subatomic particles does not have an electrical charge
associated with it? - CORRECT ANSWER-Neutrons
Isotopes of elements contain the same number of protons but different number of
neutrons . - CORRECT ANSWER-1. Protons
2. Neutrons
An ion is an atom (or molecule) that has either gained or lost electrons compared to
the neutral atom (or molecule). - CORRECT ANSWER-Electrons
Assume a hypothetical element has 119 protons and only 2 isotopes. The first
isotope has a mass of 296 amu's and has a naturally occurring abundance of 75%.
The other isotope has a mass of 298 amu's and has a naturally occurring abundance
of 25%. What would be the average atomic mass for this element? - CORRECT
ANSWER-296.5 g/mole
Gold has an atomic mass of 196.97 amu due to it's isotopes and their natural
abundance. The molar mass (the mass of 1 mole of gold atoms) is: - CORRECT
ANSWER-196.97 g/mole
Starting in 1983, a US penny has a mass of 2.50 g. How many copper atoms are
there in a US penny assuming the penny is composed only of copper? (Note: 6.02 x
1023 is expressed as 6.02 x 10^23 in the answers below). - CORRECT
ANSWER-2.39 x 10^23 atoms
, Which of the following are true concerning energy? (select all that apply) -
CORRECT ANSWER-1. It must be conserved
2. It can do work
3. It can be transferred through heat
Energy changes are tracked or followed through noting the changes in energy
between (select all that apply) - CORRECT ANSWER-1. The system
2. The surroundings
Energy lost by a system must be gained by the surroundings
(true or false) - CORRECT ANSWER-True
Energy lost by the surroundings is gained by the system (true or false) - CORRECT
ANSWER-True
The sum of the kinetic and potential energies of all the particles that compose the
system - CORRECT ANSWER-Internal energy
A system whose value depends only on the current state of the system and not on
how the system arrived at that state can be described by - CORRECT ANSWER-A
state function
A system can exchange energy with its surroundings through heat and work. As a
result, the net change in internal energy of the system can be (select all that apply)
as before the system and surroundings interacted - CORRECT ANSWER-1. Higher
2. False
3. The same
Which of the following are needed to characterize a wave? (Choose all that apply) -
CORRECT ANSWER-1. Amplitude
2. Wavelength
Light is electromagnetic radiation which is a type of energy . - CORRECT
ANSWER-1. Electromagnetic radiation
2. Energy
All waves can be described by their amplitude and wavelength . - CORRECT
ANSWER-1. Amplitude
2. Wavelength
Radio waves, microwaves, infrared (heat), and light are all electromagnetic radiation.
(True or False) - CORRECT ANSWER-True
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