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Homework 7: Descriptive Chemistry (Ignore)

There are select solutions to these problems here.

Q7.1

Predict the chemical equation for:

  1. potassium metal with liquid bromine
  2. production of lithium oxide
  3. decomposition of sodium carbonate

http://chemwiki.ucdavis.edu/Inorganic_Chemistry/Descriptive_Chemistry/Main_Group_Elements 

Q7.2

 Predict the chemical equation for:

  1. breakdown of MgCl2 in the presence of Ca, a reducing agent
  2. reaction of chlorine gas with solid calcium
  3. decomposition of slacked lime

http://chemwiki.ucdavis.edu/Inorganic_Chemistry/Descriptive_Chemistry/Main_Group_Elements 

Q7.3

What are diamonds and graphite called? What is the difference between the two?

http://chemwiki.ucdavis.edu/Inorganic_Chemistry/Descriptive_Chemistry/Main_Group_Elements 

Q7.4

Predict the chemical equation for:

  1. the formation of methane from the reaction of Ga4C3 and water
  2. the breakdown of germanium dioxide in the presence of boron

http://chemwiki.ucdavis.edu/Inorganic_Chemistry/Descriptive_Chemistry/Main_Group_Elements 

Q7.5

Predict the chemical equation for:

  1. lead(II) oxide in hydrochloric acid
  2. thermal decomposition of SiCO3(s)
  3. reaction of tin(II)oxide and carbon, a reducing agent

http://chemwiki.ucdavis.edu/Inorganic_Chemistry/Descriptive_Chemistry/Main_Group_Elements 

Q7.6

Write the chemical equations to represent the following: (a) reaction with sodium and chlorine gas (b) formation of cesium superoxide (c) combustion of sodium to form sodium peroxide.

Q7.7

Write the chemical reactions for the following: (a) reduction of BeCl2 to Be metal with Mg as a reducing agent (b) reduction of Sr metal with Br2   (c) the formation of slaked lime from quicklime and water

Q7.8

Do diamonds really last forever? Justify your answer.

Q7.9

Complete the chemical equations: 

a) _SiO2 (s) + ___ (s) --> _Al2O3 (s) + _Si (s)

c) Al4C3 (s) + _H2O (l) --> _____ (g) +_Al(OH)3 (s) 

Q7.10

Salts like NaH2PO4 are called acid salts because their anions undergo further ionization. What is the pH of 250 mL of water solution containing 10 g NaH2PO4?

Q7.11

Write chemical equations to represent the following:

  1. Formation of hydrogen peroxide (H2O2)
  2. Reaction of potassium metal with fluorine gas
  3. Combustion of sodium to form sodium superoxide

Q7.12

Write the following reactions

  1. Reduction of CaCl2 to Ca metal with Be as the reducing agent.
  2. The reaction of F2(l) and calcium metal.
  3. Neutralization of acetic acid by sodium hydroxide.

Q7.13

For each of the following, write plausible chemical equations

a) dissolving of lead (IV) oxide in HCl
b) heating of lead (II) sulfide
c) reduction of lead (II) oxide by carbon
d) reduction of Cl2(g) by Zn

Q7.14

User VSPER theory to predict the probable geometric structures of: a) XeO2, b) XeF4, and c) XeF6.
a) This is linear.
b) This is square planar.
c) This is octahedral.