26 Jun In a balanced chemical equation the total mass of the reactants equals the
Question
1. True or false:
A. In a balanced chemical equation the total mass of the reactants equals the
total mass of the products.
B. A mole of Al has the same mass as a mole of Mg
C. A mole of CH4 has the same number of molecules as a mole of C6H6
D. All chemical reactions are endothermic.
E. In any spontaneous process the entropy of the universe increases.
F. Inorganic chemistry refers to the chemistry of carbon compounds.
G. Carbon can form only single covalent bonds.
H. Addition of a soluble non-volatile compound to water results in
a freezingtemperature higher than 0oC.
I. The same amount of heat is required to increase the temperature of any
metal by a degree C.
J. Diamond, graphite, and fullerenes are all forms of carbon.
2. The overall process for production of iron from an ore is:
2Fe2O3 + 3C → 4Fe + 3CO2
How many grams of Fe can be obtained from 276.5 grams of Fe2O3 ?
3. A. How many moles are in 765 grams of C2H6O ?
B. What is the mass in grams of 3.86 moles of Na2SO4 ?
4. Using the bond energy table on page 196 of the text, determine the value
and sign of delta H for the reaction: H-H + Br-Br → 2H-Br
5. A. Why are there no structural isomers of C3H8 ?
B. Why are there no compounds with the formula C5H14 ?
C. Why is it that a number of samples with the same formula C8H18 can
have different properties
D. Which of the following, if any, is capable of forming a polymer ? Give
a reason for your answer.
1. C2H6 2. C3H6 3. C4H10 4. C6H16
6. A sample of a hydrate of NiCl2 with a weight of 0.235 grams is heated to
drive off the water leaving a weight of 0.128 grams. Determine the formula
of the hydrate? i.e. what is the value of X in NiCl2(XH2O)
7. Explain what hard water is and how it can be treated to remove the hardness.
8. A compound is found to consist of 24.25% F and 75.75% Sn by mass. Determine
the empirical formula.
9. The delta H of combustion of C2H6 is 1541kJ per mole. How many grams of C2H6
must be combusted to provide 5.00×104 kJ of energy ?
10. Explaining your answer, which, if any, of the following solutions in water will have
the highest boiling temperature ?
A. 0.20m NaCl B. 0.10m AlCl3 C. 0.40m KBr D. 0.20m CaCl2
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