Chemistry of life help !

[From: ] [author: ] [Date: 11-10-13] [Hit: ]

d. enzymes. 20.Why is carbon so special compared to other elements?a. Carbon atoms can bond to one another and form a lot of different structures.......

a. reactants.
b. acids.
c. bases.
d. enzymes.

20.Why is carbon so special compared to other
elements?
a. Carbon atoms can bond to one another and
form a lot of different structures.
b. Carbon atoms have four valence electrons and
can form quadruple bonds.
c. Only carbon atoms can form covalent bonds
with oxygen and hydrogen.
d. Only carbon atoms can be dissolved in water
solutions and suspensions.

21. Identify the reactant(s) in the chemical reaction,
CO2 + H2O H2CO3.
a. CO2, H2O, and H2CO3
b. CO2 and H2O
c. H2CO3
d. CO2

Figure 2–2

23. Carbon-12 is the most common isotope of carbon.
It has 6 protons, 6 neutrons, and 6 electrons. Of its
6 electrons, 4 are valence electrons. How many
covalent bonds can a carbon atom form?
a. 1
b. 4
c. 6
d. 12

24. Which of the following is NOT a monomer?
a. a glucose molecule
b. an amino acid
c. a nucleotide
d. a protein

-

1) D - "isotope" is used to describe elements with differing numbers of neutrons
2) C - The mass of an electron is negligible compared to the entire atom
3) C - See "1"
4) A
5) D - Water = H2O
6) A - Electrons carry a negative charge, so negative. H2O are made of mostly covalent bonds, so the charge is slight.
7) D - This is a guess; exceptions exist for everything.
8) B - Only electrons are used in bonding. Transfer of electrons results in ionic bonding.
9) A - Only the valence shell of electrons are available for bonding. There are no electrons in the nucleus.
10) B - Less negative charge from a negative particle leaving = more positive charge.
11) C - A and B can occur in solution, D is a suspension.
*It seems you have misnumbered / forgot a question*
13) Assuming all of the salt dissolves: B
14) D - Solute is WHAT is being dissolved IN the solvent.
15) B
16) D - pH of stomach acid is very acidic, so below 7. Typically, cleaning products are alkaline (basic), so above 7.
17) A - The lower the pH, the more acidic it is.
18) A - Anything lower than 7 is technically an acid.
19) C
20) A - There is an entire discipline dedicated to studying this: "Organic Chemistry" and is offered in all universities. Quadruple bonds don't exist. Many other species can dissolve in water, as well as form covalent bonds with oxygen and hydrogen.
21) B - Assuming there is supposed to be an arrow between H2O and H2CO3
23) B - Carbon has the ability to form a maximum of 4 covalent bonds with other atoms.
24) A - Glucose is formed by a saccharide.

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