1.True or false
A. When water is added to an acid solution the pH changes.
B. A solution of CO2 in water is acidic
C. As the [H+] in water increases, the pH increases.
D. The two major components of air are oxygen and nitrogen.
E. When an atom emits gamma radiation it becomes another element.
F. None of the products of uranium fission are radioactive.
G 10.0g of N2 gas in a container at a given temperature has the same
pressure as 10.og of Cl2 gas in the same size container at the same
temperature.
H. In two half-lives a radioactive element is completely gone.
I. Chlorofluorocarbon compounds are considered to be a prime cause of ozone depletion in the stratosphere..
J. Agricultural fertilizers and pesticides are some causes of water pollution
A. When water is added to an acid solution the pH changes.
B. A solution of CO2 in water is acidic
C. As the [H+] in water increases, the pH increases.
D. The two major components of air are oxygen and nitrogen.
E. When an atom emits gamma radiation it becomes another element.
F. None of the products of uranium fission are radioactive.
G 10.0g of N2 gas in a container at a given temperature has the same
pressure as 10.og of Cl2 gas in the same size container at the same
temperature.
H. In two half-lives a radioactive element is completely gone.
I. Chlorofluorocarbon compounds are considered to be a prime cause of ozone depletion in the stratosphere..
J. Agricultural fertilizers and pesticides are some causes of water pollution
-
A: True - pH = -log [H3O+] so adding more water decreases ion concentration, and therefore increases pH.
B: True - it forms carbonic acid.
C: False - as H+ (actually it is H3O+) ion concentration increases, pH actually decreases because it calculated as -log [H3O+].
D: True.
E: False. That only happens with alpha and beta radiation - gamma radiation does not involve the emission of particles, only radiation, so the nucleus is unchanged by it.
F: False - Fission products are indeed radioactive. If they weren't you would have no problem with dealing with nuclear waste!
G: False. 10 g of N2 and 10 g of Cl2 are not equivalent numbers of moles, so they would not have the same pressures when the same volumes are at the same temperatures. Pressure is directly related to amount of substance in mol.
H: False. Successive half lives simply halve the amount of substance, so if you started with 1 kg, after 1 half life you would have 500 g, after 2 half lives, 250 g, after 3 half lives 125 g, and so on. You would never reach zero, you would just get a smaller and smaller number.
B: True - it forms carbonic acid.
C: False - as H+ (actually it is H3O+) ion concentration increases, pH actually decreases because it calculated as -log [H3O+].
D: True.
E: False. That only happens with alpha and beta radiation - gamma radiation does not involve the emission of particles, only radiation, so the nucleus is unchanged by it.
F: False - Fission products are indeed radioactive. If they weren't you would have no problem with dealing with nuclear waste!
G: False. 10 g of N2 and 10 g of Cl2 are not equivalent numbers of moles, so they would not have the same pressures when the same volumes are at the same temperatures. Pressure is directly related to amount of substance in mol.
H: False. Successive half lives simply halve the amount of substance, so if you started with 1 kg, after 1 half life you would have 500 g, after 2 half lives, 250 g, after 3 half lives 125 g, and so on. You would never reach zero, you would just get a smaller and smaller number.
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