Chemistry: Semester 1 Final Exam Study
Guide
What physical quantity is measured with kL? - answerVolume
Convert a measurement of 16.2kg into grams. - answerConvert using 1,000g=1kg . Answer:
16,200g
There are 2.54cm in an inch. Convert 8.12 inches into cm - answerConvert using 2.54=1in
Answer...
What physical quantity is measured with kL? - answer✔Volume
Convert a measurement of 16.2kg into grams. - answer✔Convert using 1,000g=1kg . Answer:
16,200g
There are 2.54cm in an inch. Convert 8.12 inches into cm - answer✔Convert using 2.54=1in
Answer:20.6
An object has a mass of 0.112kg. What is the mass in mg? - answer✔1kg=1,000g 1mg=0.001g
Answer:112,000mg
Copper has a density of 8.93g/mL. If a copper statuette has a volume of 1.40 L, what is its mass?
- answer✔Conver mL to L(1mL=0.001L) Volume x density=mass . Volume=1.40x10^3mL
Density=8.93g/mL Mass/Answer=12,000g
A piece of plastic has a mass of 490kg and a volume of 350 liters. Will it float in water, which
has a density of 1.0g/mL? - answer✔Convert mass from kg to g using 1,000g=1kg. Convert
volume from L to mL using 1mL=0.001L. Density=mass/volume Density=1.4g/mL Answer: the
density is more than the water so it will not float.
In an experiment, a student burns 25.6 kg of of wood. He collects all the products, finding that it
produced 1.1 kg of ash, 48.2 kg of carbon dioxide, and 25.6 kg of water. How many kilograms of
oxygen were consumed in the burning process? - answer✔Find total mass of ash, carbon dioxide,
and water. mass of oxygen=total mass of carbon dioxide, ash, and water-mass of wood
Answer:49.3kg
A chemist reacts 11.0 g of carbon with 12.0g of oxygen to get 21.0 g of a gas, along with some
leftover carbon. In another experiment, she reacts 12.0 g of carbon with 32.0 g of oxygen to get
44.0 g of a gas. Are the two gases the same? - answer✔First Gas: Total mass at beginning
11.0g+12.0g=23.0g. Leftover carbon=23.0g-21.0g=2.0g. only 11.0g-2.0g=9.0g of carbon was
used, so the gas has 12.0g oxygen and 9.0g of carbon. Racio of oxygen and
carbon=12.0g/9.0g=1.3. Second Gas: No leftovers so Ratio of oxygen and
carbon=32.0g/12.0g=2.67. Answer: They are not the same gas
What particles are found in the nucleus of an atom? - answer✔Protons and neutrons
Which two of the following atoms are isotopes?
a. An atom with 20 protons, 20 electrons, and 21 neutrons
b. An atom with 21 protons, 20 electrons, and 21 neutrons
c. An atom with 22 protons, 22 electrons, and 22 neutrons
d. An atom with 20 protons, 20 electrons, and 20 neutrons - answer✔Atoms a and d because they
have the same number of protons.
Which subatomic particle has no charge? - answer✔neutron
A chemist is studying two isotopes of argon. The second has less mass than the first. Which has
more neutrons? - answer✔The first one. the isotope with more neutrons will have more mass.
An element has 19 protons and 21 neutrons. what is the symbol, including the mass number? -
answer✔40^K. 21+19=40
Which light has a higher energy: orange light or violet light? - answer✔Violet light. It has a
shorter wavelength which means it has a higher frequency . Since energy and frequency are
directly proportional, that means it has a higher energy as well.
What is the mass of the average chlorine atom, in grams? - answer✔35.45 amu x 1.66x10^-24g/1
amu=5.88x10^-23
What is the most abundant isotope of calcium? - answer✔The most abundant isotope is 40^Ca
An electron ina hydrogen atom jumps from the ground state to the n=3 orbit. A second electron
in another hydrogen atom jumps from the ground state to the n=5 orgit. Which electron absorbed
light of higher frequency? - answer✔The second electron(the one that jumped from to the n=5
orbit)
What is the frequancy of light that has a wavelength of 212 nm? - answer✔Convert nm to n
using 10^-7. f=c/wavelength=3.00mx10^8/sec/2.12x10^-7=1.42x10^15 1/sec Answer:3.43x10^-
19J
An electron in a hydrogen atom emits a photon with a wavelength of 5.80x10^-7m. What is the
difference in energy between the orbit it came from and the orbit to which it jumped? -
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