A few chemistry questions?

Question

1. Which of the following solids consists of atoms or molecules held together only by Van Der Waals forces?
1



a.
carbon dioxide




b.
water




c.
silicon dioxide




d.
copper





2. What is the approximate value of the O-C=O bond angle in ethanoic acid?
1



a.
45 degrees




b.
90 degrees




c.
120 degrees




d.
180 degrees





3. Which of the following does NOT contain hydrogen bonds?
1



a.
Ammonium chloride




b.
Ammonia




c.
Nitric acid




d.
Water





4. In microwave ovens, the wave energy produced is absorbed by certain polar molecules.
Which of the following would absorb microwave energy?
1



a.
Aluminium trichloride




b.
Carbon dioxide




c.
Ethanol




d.
Sodium chloride





5. The grid represents two periods of the Periodic Table, for the elements with proton number from 3 to 18:






P





Q



R


S



An element from 1 group, P, Q, R or S, reacts with an element from another of these groups to produce a compound with a giant covalent structure.
Which are these 2 groups?
1



a.
P and R




b.
Q and R




c.
Q and S




d.
R and S





6. Graphite can be used as a lubricant; diamond cannot. This is because graphite has
1



a.
Mobile ions




b.
A hexagonal arrangement of atoms in the layers




c.
Van Der Waals forces between the layers of atoms




d.
Covalent bonds between atoms in the layers





7. 109.5°

107°

105°

0.096 nm

0.101 nm

0.109 nm

The bond lengths and bond angles in the molecules of methane, ammonia and water may be represented as follows:

What causes this trend in bond angles shown?
1



a.
Increasing repulsion between hydrogen atoms as the bond length decreases




b.
The number of bonding electron pairs in the molecule




c.
A non-bonding electron pair having a lower repulsive force than a bonding electron pair




d.
The number of non-bonding electron pairs in the molecule





8. Which type of bond is responsible for intermolecular forces in liquid tetrachloromethane?
1



a.
Covalent bonding




b.
Hydrogen bonding




c.
Temporary dipole-induced dipole attractions




d.
Permanent dipole-permanent dipole attractions





9. A solution of ammonia in water contains
1



a.
Simple molecules only




b.
Simple molecules and hydrogen bonded molecules only




c.
Simple molecules, hydrogen bonded molecules and ions




d.
Ions only





10. The diagram below shows a liquid flowing from a burette and a charged rod being brought near the flow.

Which liquid would be deflected as shown?
1



a.
Bromine




b.
Hexachloroethane




c.
Cyclohexane




d.
Trichloromethane





11. In which one of the following does ionic bonding occur between the named atoms?
1



a.
Aluminium and chlorine in tetrachloroaluminate ion




b.
Boron and fluorine in boron trifluoride




c.
Hydrogen and chlorine in hydrogen chloride




d.
Hydrogen and sodium in sodium hydride





12. The radius and charge of each of 6 ions are shown in the table below:

Ion
J+
L+
M2+
X-
Y-
Z2-

Radius/nm
0.14
0.18
0.15
0.14
0.18
0.15


The ionic solids JX, LY and MZ are of the same lattice type.

What is the correct order of their lattice energies placing the one with the highest numerical value first?
1



a.
JX > LY > MZ




b.
JX > MZ > LY




c.
LY > MZ >JX




d.
MZ > JX > LY





13. Silicon carbide is a shiny, hard, chemically inert material with a very high melting point. It can be used to sharpen knives and make crucibles. Which type of structure explains these properties?
1



a.
A giant structure with covalent bonds between silicon and carbon atoms




b.
A giant structure containing metallic bonding




c.
A giant layer structure with covalent bonds between atoms and Van Der Waals forces between the layers




d.
A simple molecular structure with covalent bonds between atoms of silicon and carbon











14. A stable molecule containing atoms of the elements X, Y and Z has the following structure:

Which elements could X, Y and Z be?
1



a.
X=N, Y=P, Z=Cl




b.
X=O, Y=S, Z=Cl




c.
X=B, Y=C, Z=H




d.
X=P, Y=Si, Z=H


15. Which one of the following sets of solid elements A, B, C or D includes a giant metallic structure, a macromolecular structure and a simple molecular structure? 1
a. Na Mg Al
b. Mg Al Si
c. C Si Sn
d. Al Si S
16. Which of the following is an example of a substance with a macromolecular structure? 1
a. Aluminium chloride
b. Ice
c. Magnesium oxide
d. Silicon dioxide
17. The molecules listed below are of the general formula XYn, with n more than or equal to 2. In which is the Y-X-Y angle greatest? 1
a. BF3
b. CH4
c. NH3
d. PCl3



18. The sulphite ion may be represented as:

What is the O-S-O bond angle?
1



a.
About 90 degrees




b.
About 107 degrees




c.
About 109.5 degrees




d.
About 117.5 degrees


19. Which of the following statements about the properties associated with ionic and covalent bonds is correct? 1
a. A covalent bond cannot be an electrolyte.
b. The only covalent compounds with high melting points are those in which hydrogen bonds occur.
c. Ionic bonds and covalent bonds cannot both occur in the same compound.
d. Ionic compounds differ from metals in that ionic compounds do not conduct electricity in the solid state



20. Cleavage readily occurs along planes of crystals of ionic solids because the ions in the crystal are 1
a. Arranged in a regular fashion
b. Strongly bonded together
c. Weakly bonded together
d. Charged

lol I got the answers now
a
c
a
c
b
c
d
c
c
d
d
d
a
a
d
a
b
d
a

TheOnlyBeldin you caused me to answer some questions wrongly, I was wrong to believe you!

Answer 1

1. ) Weren't Van Der Waals forces defeated by Hitler?
20.) Cleavage occurs beautifully in well endowed women.

You question is way too big. Use less spaces, and split into smaller groups. I did not even look at 2-19. I am surprised anyone did.

Answer 2

1. a. Others have metallic, network, or hydrogen bonds
2. c. sp2 hybridization
3. a. Have to have a lone pair of electrons on an atom for hydrogen bonding to take place, and the nitrogen in ammonium does not have one.
4. c. Ethanol is a polar molecule
5. Can't answer without ther graphic
6. c. Van der Waals forces allow the sheets of carbon in graphite to "slide," whereas diamond's network bonding won't.
7. d. Non-bonding pairs take up more space (VSEPR Theory)
8. c. Carbon tetrachloride is a non-polar molecule with polar bonds, so there is no permanent dipole in the molecule
9. c. Ammonia will, to a degree, react with water to produce ammonium hydroxide, which will dissociate to ammonium ions and hydroxide ions.
10. d. Trichloromethane is the only polar molecule in the group.
11. c. Others are polar covalent.
12. d. Stronger lattice energy between the divalent species, and then the smaller radii allow for closer proximity and more energy required to break bonds.
13. a. Network bonding explains these properties.
14. Can't answer without the structure
15. sorry, not sure
16. d. Network bonding in SiO2
17. a. BF3 is sp2 hybridized, with 120 degree angles. The others are sp3 hybridized, with angles of 109.5 degrees or less.
18. d. SO3(2-) is trigonal planar
19. No really one absolutely correct answer, but a is the closest.
20. a.

Answer 3

1. a. Others have metallic, network, or hydrogen bonds
2. c. sp2 hybridization
3. a. Have to have a lone pair of electrons on an atom for hydrogen bonding to take place, and the nitrogen in ammonium does not have one.
4. c. Ethanol is a polar molecule
5. Can't answer without ther graphic
6. c. Van der Waals forces allow the sheets of carbon in graphite to "slide," whereas diamond's network bonding won't.
7. d. Non-bonding pairs take up more space (VSEPR Theory)
8. c. Carbon tetrachloride is a non-polar molecule with polar bonds, so there is no permanent dipole in the molecule
9. c. Ammonia will, to a degree, react with water to produce ammonium hydroxide, which will dissociate to ammonium ions and hydroxide ions.
10. d. Trichloromethane is the only polar molecule in the group.
11. c. Others are polar covalent.
12. d. Stronger lattice energy between the divalent species, and then the smaller radii allow for closer proximity and more energy required to break bonds.
13. a. Network bonding explains these properties.
14. Can't answer without the structure
15. sorry, not sure
16. d. Network bonding in SiO2
17. a. BF3 is sp2 hybridized, with 120 degree angles. The others are sp3 hybridized, with angles of 109.5 degrees or less.
18. d. SO3(2-) is trigonal planar
19. No really one absolutely correct answer, but a is the closest.
20. a.

Answer 4

Try doing your own work first and limit your questions to one not 100.!!

Answer 5

acacbcdccdddaadabd
The answers not separated