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WGU C371 CONCEPTS OF SCIENCE.
EXAM QUESTIONS AND A NSWERS,
100% ACCURATE, VER IFIED
Question :Exactly one pound of bread dough is placed in a
baking tin. The dough is cooked in an oven at 350ºF, releasing a wonderful aroma of freshly baked bread during the cooking process. Which of the following options accurately describes the mass of the baked loaf?The mass of the baked loaf is less than the mass of the one pound of the original dough because a gas is produced during the baking process. The gas escapes the dough and is responsible for the aroma of freshly baked bread.
Correct answer:The mass of the baked loaf is less than the
mass of the one pound of the original dough because a gas is produced during the baking process. The gas escapes the dough and is responsible for the aroma of freshly baked bread.
Question :Which of the following options describes a change
in potential energy only?A leopard waits in a tree in order to more easily seek prey.
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Correct answer:A leopard waits in a tree in order to more
easily seek prey.
Question :The metal bleachers at a football stadium heat up in
the sun. Which of the following options best describes the type of energy transfer occurring in this situation?Thermal energy
Correct answer:Thermal energy
Question :Which of the following is a pure substance?
aluminum sulfate, Al2(SO4)3
Correct answer:aluminum sulfate, Al2(SO4)3
Question :1 (Proton)/1 H, 2(Proton + 1 Neutron)/1 H,
2(Proton + 2 Neutron)/1 H Which of the following options best describes this illustration?Isotopes (neutron count changes)
Correct answer:Isotopes (neutron count changes)
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Question :Bromine (used to make silver bromide, the
important component of photographic film) has two naturally occurring isotopes. One has a mass of 78.918336 amu and a percent abundance of 50.69%, and the other has a mass of 80.916289 amu and a percent abundance of 49.31%. What is the average atomic mass of bromine?
79.90 amu
Correct answer:79.90 amu
Question :Gallium has two naturally occurring isotopes, 69Ga
and 71Ga, with masses of 68.9257 amu and 70.9249 amu, respectively. The average atomic mass of gallium is 69.723 amu. What is the percent abundances of these isotopes of gallium?
60.1% 69Ga ; 39.9% 71Ga60.1% 69Ga ; 39.9% 71Ga
Correct answer:60.1% 69Ga ; 39.9% 71Ga60.1% 69Ga ;
39.9% 71Ga
Question :Which of the following objects is the smallest?
Choices:
Molecule
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Electron Cell Atom Electron
Correct answer:Electron
Question :Which of the following objects is the smallest?
Nucleus Proton Atom Molecule Proton
Correct answer:Proton
Question :Which pair of elements would most likely form a
covalent compound?Chromium and oxygen Magnesium and nitrogen Sulfur and phosphorus