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Multiple Choice Quiz
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Please answer all questions

1
An electrically neutral atom bears what trait?
A)It contains protons in its nucleus.
B)It contains the same number of protons and neutrons.
C)It contains the same number of electrons and protons.
D)It contains electrons in its electron shells.
2
Isotopes of the same element vary in the number of _______________ they contain.
A)protons
B)neutrons
C)electrons
D)radioactive particles
3
Radioactive isotopes emit energy or particles until they reach a stable form. Which type of radiation emitted by a radioactive isotope can be the most penetrating, and thus the most damaging, to living things?
A)alpha radiation
B)beta radiation
C)gamma radiation
D)atomic radiation
4
Ionic bonds tend to form between ____________________.
A)atoms that have become electrically, and oppositely, charged
B)atoms that share a single pair of electrons
C)atoms that share two pairs of electrons
D)hydrogen and oxygen atoms that bear weak but opposite charges
5
Which of these molecular formulas represents a compound?
A)H2
B)O2
C)N2
D)C6H12O6
6
Chemical reactions occur as bonds are formed or broken between molecules. The molecules that are changed by a reaction are called _______________.
A)products
B)ions
C)reactants
D)acids
7
The reaction NaCl → Na+ + Cl-, as written, represents what type of reaction?
A)synthesis reaction
B)decomposition reaction
C)exchange reaction
D)reversible reaction
8
Electrolytes that release hydrogen ions (H+) in water are called ________________.
A)acids
B)bases
C)salts
D)electrically neutral
9
A substance with a hydrogen ion concentration of 0.000001 g/L has a pH of ___________.
A)2
B)5
C)6
D)7
10
Animal polysaccharides or _______________, consists of branched chains of sugar units and functions to store energy.
A)glycogen
B)steroids
C)dextrose
D)cellulose
11
A fatty acid in which the carbon atoms are all linked by single carbon- carbon bonds is said to be _________________.
A)polyunsaturated
B)monounsaturated
C)linked
D)saturated
12
Choose the correct statement about proteins and their structure.
A)Hydrogen bonding rarely occurs in proteins.
B)Most proteins are made from a short chain of amino acids.
C)A denatured protein is equally effective as the protein in its original shape.
D)A protein's conformation determines its function.
13
Myoglobin, hemoglobin, and many enzymes are ________________ proteins.
A)globular
B)fibrous
C)linear
D)pleated sheer
14
DNA contains each of the following components, except ______________.
A)5-carbon sugar
B)a single polynucleotide chain
C)phosphate group
D)organic base
15
The smallest complete unit of an element is the _____.
A)atom
B)molecule
C)element
D)electron
16
Which of the following does not belong with the others?
A)proton
B)neutron
C)electron
D)nucleus
17
What is the sum of the neutrons plus protons equal to?
A)atomic number
B)bulk number
C)atomic symbol
D)mass number
18
Which of the following is not nearly as abundant as the others in living cells?
A)Na
B)Mn
C)P
D)N
19
Which element has the nuclear configuration of 12/6?
A)carbon
B)oxygen
C)N
D)K
20
The symbol Na+ is used to describe a sodium _____.
A)atom
B)free radical
C)ion
D)molecule
21
Of the following, which represents an organic compound?
A)H2O
B)O2
C)nitrous oxide
D)C6H12O6
22
Whenever a partially charged hydrogen comes near a partially charged oxygen on another atom, a _____ bond is formed.
A)covalent
B)hydrogen
C)ionic
D)polar covalent
23
Water tends to dissociate, forming ions; which pH value indicates that the [H+] equals the [OH-]?
A)6
B)0
C)7
D)14
24
Which of these is the correct formula for a base?
A)HCl
B)NaOH
C)H2SO4
D)H2O
25
At what pH is a solution completely acidic? ____
A)0
B)7
C)14
D)7.4







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