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Chem 120 Exams|123 Questions with Accurate Answers
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Chem 120 Exams|123 Questions withAccurate Answers
How many meters are in 1 kilometer? - -1000
-The amount of matter in an object is its - -mass
-A piece of metal is believed to be either platinum (valuable) or nickel (not
so valuable). One way to decide is to calculate the density. The piece of
metal is found to have a mass of 156.485 g. The piece of metal has an odd
shape, so geometry cannot be used to calculate the volume. Instead, the
volume is determined by seeing how much water it displaces: 51.2 mL of
water is placed in a container. The metal piece is dropped in, and the water
level rises to 58.5 mL. What is the density of the metal? - -21.4 g/mL
-Which of the following has the largest density? - -*1.8 g object with a
volume of 1.0 mL*
1.8 g object with a volume of 4.0 mL
1.8 g object with a volume of 2.0 mL
-Gold has a density of 19.3 g/mL. Calculate the weight in grams of 16.0 mL
of gold (about 1 cubic inch). Round your answer to the tenths place (0.1) and
include units. - -309 g
-An element has a mass number of 37 and 17 electrons. What is the atomic
number? - -17
-The atomic number of an atom is equal to - -the number of protons in the
nucleus
-In the Bohr model of the atom - -electrons are found only in certain orbits
about the nucleus
-Isotopes have - -the same number of protons but different neutrons
-An element has a mass number of 37 and 17 electrons. How many neutrons
are present? - -20
-An element has a mass number of 37 and 17 electrons. What is the symbol
of the element? - -Cl
-Identify the smallest subatomic particle - -an electron
, -Which of the following is false about background radiation? - -You only are
exposed when you have an X-ray, but not from the natural environment.
-Which of the following types of radiation is the heaviest, slowest, and least
penetrating? - -alpha
-To protect yourself from radiation, you should - -decrease time exposed
and increase distance from the source of radiation
-Describe what changes occur during gamma ray emission. - -The mass
number and atomic number do not change.
-Describe what changes occur during alpha decay. - -The mass number and
atomic number decrease.
-Describe what changes occur during beta decay. - -The mass number is
unchanged and the atomic number increases.
-Protons Neutrons Electrons
Atom A 6 6 6
Atom B 7 6 7
Atom C 6 7 6
Are A and C isotopes? - -yes
-Protons Neutrons Electrons
Atom A 6 6 6
Atom B 7 6 7
Atom C 6 7 6
Are B and C isotopes? - -no
-Niels Bohr is responsible for the - -shell model of electron arrangement
(quantum theory)
-JJ Thomson is responsible for the - -discovery of electron and charge/mass
ratio
-The energy given off in a nuclear reaction comes from - -a small loss of
mass in the reaction
-In fission, - -One neutron starts the reaction and then several (2 or 3)
neutrons are given off during the reaction
-_______+ 1 1H --> 4 2He + 40 20Ca - -43 21Sc
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