1) Which of the following molecular structures is incorrect? A. CH3—NH3 B. CH2==
ID: 12209 • Letter: 1
Question
1) Which of the following molecular structures is incorrect?A.
CH3—NH3
B.
CH2==CH2
C.
CH3—NH2
D.
CH3—NH3+
E.
CH3—CH3
Answer choice C
2) Table salt, NaCl, is neutral. When dissolved in water, NaCl
A.
remains as NaCl (does not dissociate).
B.
separates to form Na– and Cl+ molecules.
C.
separates to form Na+ and Cl– ions that do not interact with water molecules.
D.
separates to form Na+ and Cl– ions that interact with water molecules.
E.
does not separates, but interacts with water molecules.
Answer choice D
3) An element that contains ten protons and ten electrons is likely to
A.
form covalent bonds with another element.
B.
form ionic bonds with another element.
C.
be chemically inert (stable).
D.
be radioactive.
E.
be toxic.
Answer choice C
4) For a covalent bond to be polar, the two atoms that form the bond must have
A.
different atomic weights.
B.
the same number of electrons.
C.
different melting points.
D.
different electronegativities.
E.
similar electronegativities.
The answer choice D
5) Water is essential to life. Which of the following physical properties of water affect(s) life in some beneficial way?
A.
Cohesiveness
B.
High heat capacity
C.
High heat of vaporization
D.
Hydrogen bonds
E.
All of the above
Answer choice e.
6) Which of the following biological molecules are linked by covalent bonds formed by the removal of the elements of water from the reactants (a kind of condensation reaction)?
A.
Oils
B.
Fats
C.
Proteins
D.
Starch
E.
All of the above
Answer choice d
7) Which of the following statements is inconsistent with the first and second laws of thermodynamics?
A.
Living organisms can produce energy.
B.
Chemical energy may be converted to light energy.
C.
The total energy of a system is available to do work.
D.
Potential energy may be used to do work.
E.
Both a and c
The answer choice e
8) The synthesis of complex molecules _______ energy, whereas their degradation _______ energy. Synthesis occurs with _______ in entropy.
A.
requires; releases; an increase
B.
requires; releases; a decrease
C.
releases; requires; no change
D.
releases; requires; an increase
E.
requires; releases; no change
The answer choice D
9) Entropy
A.
is the total energy in a system.
B.
tends to decrease the total energy in the universe.
C.
when multiplied times the absolute temperature, is the useable energy in a system.
D.
is related to the disorder or randomness of a system.
E.
is represented in equations by the letter “H.”
The answer choice D
10) A reaction that has a negative ?G
A.
is endergonic.
B.
necessarily proceeds more rapidly than a reaction with a less negative ?G.
C.
is spontaneous.
D.
cannot be used to drive a reaction with a positive ?G.
E.
is always paired with a reaction with a positive ?G.
Answer choice C
Explanation / Answer
1) A N - has 3 valency so it can form 3 bonds 2)D. separates to form Na+ and Cl– ions that interact with water molecules. 3)C. be chemically inert (stable). 4)D. different electronegativities. you all other are correct except for the 1st question
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