FUNDAMENTALS OF CHEMISTRY I
September 26, 2012
INSTRUCTIONS:
PRINT YOUR NAME ————> NAME
QUIZ II
WORK # 1
WORK 2 OF #2 THROUGH #4
SHOW YOUR WORK FOR PARTIAL CREDIT
THE LAST PAGES ARE A PERIODIC TABLE AND A SCRATCH SHEET
R = 0.08206 lit-atm/mol-K
1
R = 8.3145 J/mol
h = 6.626 X 10-34 J-s
c = 2.9979 X 108 m/s
Hvaporization for H2O at 100 °C = 40,700 J/mole
2
3
4
TOTAL(75)
(a) What are the three subatomic particles that make up all atoms, their charges and their
locations
Particle
charge
location
1)
2)
3)
(b) Describe the structure of the nuclear model of the atom
(c) A level Teaspoon of sugar has 15 Calories (food calories). How many J of energy is
this, (1 cal = 4.184 J, and 1 food calorie = 1000 cal)
(d) Characterize these microscopic view as either an element, a compound, or a
mixtuire
(e) A winter day has a temperature of 5.00 °C What is this temperature in K and °F?
2 In an experiment, 400.0 J of heat is transferred to 75.0 g piece of metal originally at
25.00 °C. The heat causes the metal to warm up to 30.91 °C. Calculate the specific heat
capacity of the metal and identify it from the table.
Substance
Lead
Silver
Copper
Iron
Aluminum
Specific
Heat Capacity (J/(g-°C)
0.128
0.235
0.385
0.449
0.903
3. Determine whether the following are endothermic or exothermic processes. Consider
whether the process is endothermic or exothermic from the point of view of the object in
parenthesis.
A tea kettle with water is heated to boiling on the gas burner of stove (the water)
______________________
A tea kettle with water is heated to boiling on the gas burner of stove (gas burner)
______________________
Warming your hands at a fire (your hands) ________________________
When an acid and a base are mixed, the solution warms (the acid and the base)
________________
Solid dry ice converting to gaseous carbon dioxide (the dry ice)_____________________
4. Sodium Chloride is made up of the elements sodium and chloride combined in a ratio
of 1 to 1 by atoms and 22.99 to 35.45 by mass respectively. (we will learn in chapter 4
that the atoms gain or lose electron to be come ions?
Answer the following questions about sodium chloride:
(a)What is the symbol and atomic number of chlorine? ________________ number_____
(b)What is the symbol and atomic number of sodium? ________________ number____
(c)Is sodium chloride an element, a compound, a heterogeneous mixture, or a
homogeneous mixture?____________________________________________
For (d)-(x), Identify the following as chemical or physical properties:
(d) Sodium chloride melts at about 801 °C__________________________
(e) Sodium chloride is soluble in water________________________
(f) Solutions of sodium chloride react with silver sulfate to form a white powder silver
chloride _________________________
(g) Sodium chloride is found in nature as a white rock called halite__________________
g
(h) The density of Sodium chloride is 2.165 /cm3.___________________________
(i) Running electricity through a solution of Sodium chloride produces chlorine
gas___________________________
(j) Evaporation of sea water leaves mostly Sodium chloride _______________________
(k) Sodium chloride reacts with calcium carbonate to produce sodium carbonate and
calcium chloride. ___________________
(l) Molten Sodium chloride conducts electricity ______________________