Wednesday, December 16, 2020

Ashworth Semester Exam SC14S Elements of Chemistry

SC14S : Elements of Chemistry
Ozone is considered an air pollutant in the __________ but is a valuable protective layer in the __________.
troposphere; stratosphere
stratosphere; mesosphere
stratosphere; troposphere
mesosphere; stratosphere

The periodicity of the properties of elements is chiefly due to the:
numbers of electrons in the atoms of the elements.
distribution of electrons in the atoms of the elements.
numbers of neutrons and electrons in the atoms of the elements.
Both the numbers of electrons in the atoms of the elements and the distribution of electrons in the atoms of the elements.

The carbon cycle refers to:
the mechanism by which carbon dioxide causes global warming.
the frequency of light energy that affects the rotational energy of carbon dioxide.
the oxidation of glucose to form carbon dioxide and water.
the movement of carbon through living organisms, the atmosphere, the sea, and the earth.

Thermal energy:
decreases as the temperature of a body increases.
is characterized by the random motion of molecules.
is the only form of energy that can be transformed into work with 100% efficiency.
causes the mass of a body to increase.

Which statement concerning groundwater is correct?
Any water found above ground that needs treatment to remove contaminants
Any water found above ground that is usually free of contaminants
Any water pumped from wells that have been drilled into underground aquifers that needs treatment to remove contaminants
Any water pumped from wells drilled into underground aquifers that is usually free from harmful contaminants

Fission is the process of creating energy by:
combining small nuclei to form a larger, more stable nucleus.
combining small nuclei to form a larger, less stable nucleus.
splitting large nuclei with bombarding protons.
splitting large nuclei with bombarding neutrons.

A polymer is a large molecule:
held together by hydrogen bonds.
made up of long chains of atoms covalently bonded together.
made up of large lattice structure held together by ionic bonds.
always made up of identical monomer units.

The father of modern medicine, Hippocrates, described making a "tea" that was effective against fever by boiling willow bark. Years later the active ingredient was isolated and chemically modified to produce the drug we now know as:
acetaminophen.
aspirin.
ibuprofen.
penicillin.

With respect to diet, which statement is correct?
It is possible to be overweight and malnourished.
If a person is malnourished, he/she would have to be anorexic.
It is possible to be undernourished and not anorexic.
If you meet your daily caloric intake, you can be undernourished.

The human genome is organized into:
50 chromosomes.
23 pairs of chromosomes.
1 Y chromosome and 1 X chromosome.
23 chromosomes.



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