plz do the quiz
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chem_011.zipCHEM 011 TEST 1.docx
CHEM 011 TEST 1
1. Please provide definitions for the following terms.
Atoms
Elements
Atomic number
Mass number
Isotope
2. Please convert units.
1cm3 to m3
100°C to K
100°C to F
500cm to m
500ml to L
3. Please provide oxidation number for the following terms.
MgSO4
Ca(OH)2
IF7
4. Please provide atomic number for the following terms.
Na
K
Mg
Ca
F2
5. How many electrons, protons and neutrons are present in the following terms?
CHEM 011 TEST 2.docx
CHEM 011 TEST 2
Answer any five questions.
1. Sulfur hexafluoride (SF6) is a colorless, odorless, very unreactive gas. Calculate the pressure (in atm) exerted by 1.82 moles of the gas in a steel vessel of volume 5.43L at 69.5°C.
2. Ammonia burns in oxygen to form nitric oxide (NO) and water vapor. How many volumes of NO are obtained from one volume of ammonia at the same temperature and pressure?
3. Argon is an inert gas used in light bulbs to retard the vaporization of the filament. A certain light bulb containing argon at 1.20 atm and 18°C is heated to 85°C at constant volume. What is the final pressure of argon in the light bulb (in atm)?
4. A sample of natural gas contains 8.24 moles of CH4, 0.421 moles of C2H6 and 0.116 moles of C3H8. If the total pressure of the gases is 1.37 atm, what is the partial pressure of propane (C3H8)?
5. Oxygen gas generated by the decomposition of potassium chlorate is collected as shown in Figure 5.15. The volume of oxygen collected at 24°C and atmospheric pressure of 762 mmHg is 128ml. Calculate the mass (in grams) of oxygen gas obtained. The pressure of the water vapor at 24°C is 22.4 mmHg.
2KClO3 (s) –> 2KCl (s) + 3O2 (g)
6. What is the volume of CO2 produced at 37°C and 1.00 atm when 5.60g of glucose are used up in the reaction?
C6H12O6 (s) + 6O2 (g) -> 6CO2 (g) + 6HCl (l)
CHEM 011 TEST 3.docx
CHEM 011 TEST 3
1. How much heat is evolved when 266 g of white phosphorus (P4) burns in air? Take Atomic weight of P to be 31.
P4 (s) + 5O2 (g) -> P4O10 (s) DH=-3013kj
2. Calculate the standard enthalpy of formation of CS2 (l) given that:
C (graphite) + O2 (g) -> CO2 (g) DH0 = -393.5kj
S (rhombic) + O2 (g) -> SO2 (g) DH0 = -296.1kj
CS2 (l) + 3O2 (g) -> CO2 (g) + 2SO2 (g) DH0 = -1072kj
3. Describe first law of thermodynamics.
4. Define enthalpy. How does the change in enthalpy equal the change in internal energy at constant pressure?
CHEM 011 TEST 4.docx
1. Classify the elements in the periodic table.
2. What is effective nuclear charge (Zeff) and how does it relate to the number of core electrons in an atom?
3. How does the atomic radius vary across a group and period in the periodic table?
4. How does the ionization energy vary across a group and period in the periodic table?
