Iron. 1) Carbon dioxide. Rust. Water. Aluminum. Tea. Isopropyl alcohol. Lead. Glass.
Sulfur. Blood. Which are elements? Which are compounds? Which are mixtures?
2)
238
92
U
235
92
U
18
8
O
16
8
O
Listed above are two types of uranium and oxygen. How is each one different?
What is it called when there are two types of the same element, as above?
What are the atomic numbers?
What are the mass numbers?
What is the number of protons of each? Of neutrons? Of electrons?
3) Heres a number: .0007534. What is this number in % form? In scientific notation? In
ppm?
1.776*10-3 is equivalent to what number in % form? In ppm? In ordinary decimal form?
4) Fe
+
O2
Fe2O3
Balance this equation.
5) What is the energy of electromagnetic radiation with a wavelength of 444 nanometers?
What is its frequency?
What is the wavelength of electromagnetic radiation with a frequency of 9.55*104 s-1?
What is its energy?
6) Showing all electrons or electron pairs, draw the Lewis structure of N2, O2, O3, Cl2,
CO, CO2, H2O, CH2ClF, and HOOH. What is their geometry?
7) What is the expected C-O-H bond angle of CH3OH?
What is the expected H-C-H bond angle?
8) Why does ozone screen out different ranges of ultraviolet radiation than O2?
How is the chlorine radical created, and what do CFCs have to do with the destruction of
the ozone layer?
How can just a few CFCs be so destructive to the ozone layer?
9) What is a greenhouse CO2, gas?
Compare O2, and N2. Which are greenhouse gases, which are not, and what makes
them so?
Where did/does all the CO2 come from?
What is a CO2 sink, and what are some examples of them?
10) What are the vibrational modes of CO2 and H2O? Which are infrared active, and
which are not?
11) What are the differences between the problem of ozone depletion and the problem of
global warming?
12) How many atoms are in 5 moles of Cu?
How many molecules are in 5 moles of H2?
What is the molar mass of C2H4?
What is the % carbon in C2H4?
If you have 240g of CH4, how many moles of CH4 do you have? How many molecules?
13)
CH4 + 2O2 CO2 + 2H2O
In the above combustion reaction, how many grams of CO2 would be formed if you
began with 2.40*102g of CH4? How many grams of H2O would be formed?
14) If there is a fuel that has a molecular weight of 110 and produces 565 kJ/mol, how
much energy will evolve if you burn 5.00 g of this fuel?
15) What is a fossil fuel? Why are fossil fuels so important?
O
C
H . Given that the bond energy
16) The molecule of formaldehyde looks like this: H
for O-H is 467 kJ, the bond energy for O-C is 336 kJ, the bond energy for C-H is 416 kJ,
the bond energy for O=O is 498 kJ, and the bond energy for C=O is 803 kJ, what is the
net energy change expected when one mole of formaldehyde is burned in oxygen to form
water and CO2? Is this reaction endothermic or exothermic?