Introductory Chemistry For Today
8th Edition
ISBN: 9781285644561
Author: Seager
Publisher: Cengage
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(A) if both sentences are true, (B) if both sentences are false, (C) if the first sentence is true but the second is false, and (D) if the first sentence is false but the second is true.
1. Radioactive wastes, like uranium, must be handled and disposed of according to special regulations designed to protect people and the environment. Nuclear power plants produce too much greenhouse gases due to the burning of uranium.
2. In the experiment on determining the dissolved oxygen concentration of a water sample, the compound used to acidify the sample was hydrochloric acid. An acidic solution will have a pH greater than 7.
3. Pure water has a slight blue coloration that goes deeper as the thickness of the sample increases. Water follows the temperature of its surrounding.
4. The solubility of oxygen in water increases at colder temperatures, and decreases at higher temperatures. DO can be measured in milligrams of oxygen (O2) per liter of water.
5. An atom is composed of three subatomic…
Looking at isotope ratios, we can determine past climates. Please explain how the ration of Oxygen 18 to Oxygen 16 helps to determine whether a past climate was colder or warmer than todays climate.
Calculate average atomic weight of Uranium using isotopic abundances of its three isotopes: U-234 (abundance of 0.006%) and U-235 (abundance of 0.720%), U-238 (abundance of 99.274%).
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- The vitamin niacin (nicotinic acid,C6H5NO2 ) can he isolated from a variety of natural sources, such as liver, yeast, milk, and whole grain. It also can be synthesized from commercially available materials. Which Source of nicotinic acid, from a nutritional view, is best for use in a multivitamin tablet? Why?arrow_forward2.86 For some uses, the relative abundance of isotopes must be manipulated. For example, a medical technique called boron neutron capture therapy needs a higher fraction of 10B than occurs naturally to achieve its best efficiency. What would happen to the atomic weight of a sample of boron that had been enriched in 10B? Explain your answer in terms of the concept of a weighted average.arrow_forwardThe following isotopes are important in nuclear power. Write their symbols in the form XZA. a. U-235 b. U-238 c. Pu-239 d. Xe-144arrow_forward
- FILL IN THE BLANK This experiment concerns kinetics and isotopes. Isotopes are atoms of an element that differ only in the number of (electrons, neutrons, protons?) We rarely talk about isotopes unless radioactivity is involved. A radioactive isotope can emit alpha rays which are (electrons, photons, helium 4 nuclei?) beta rays which are (electrons, photons, helium 4 nuclei?) or gamma rays which are (electrons, photons, helium 4 nuclei?) Despite our rare discussion of isotopes we actually cover them very early in our study of chemistry when we learn that the Periodic Table advertises the average atomic mass of an element as a weighted average of the various isotopes. Chlorine has two isotopes: chlorine-35 massing at about 35 g/mol and chlorine-37 massing at about 37 g/mol. The average atomic mass of chlorine is 35.453 g/mol instead of being close to 36 g/mol because (Cl-37, Cl-35?) is more abundant than the other isotope. The fact that the Periodic Table reports weighted average molar…arrow_forwardThe uranium atom is the heaviest of the common naturally occurring elements but uranium is not the densest element. Explain how this is possible.arrow_forward
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