Answer the following question given this paragraph: Melting and boiling points are somewhat unique identifiers, especially of compounds. In addition to giving some idea as to the identity of the compound, important information can be obtained about the purity of the material. Q: What is the boiling and freezing point of water in celcius? Choices: - 100 degrees c and 32 degrees c - 212 degrees c and 0 degrees c - 212 degrees c and 32 degrees c - 100 degrees c and 0 degrees c A:
100 degrees c and 0 degrees c

Answer the following question given this paragraph: 29.3 Photon Energies and the Electromagnetic Spectrum 11. Why are UV, x rays, and rays called ionizing radiation? 12. How can treating food with ionizing radiation help keep it from spoiling? UV is not very penetrating. What else could be used? 13. Some television tubes are CRTs. They use an approximately 30-kV accelerating potential to send electrons to the screen, where the electrons stimulate phosphors to emit the light that forms the pictures we watch. Would you expect x rays also to be created? 14. Tanning salons use "safe" UV with a longer wavelength than some of the UV in sunlight. This "safe" UV has enough photon energy to trigger the tanning mechanism. Is it likely to be able to cause cell damage and induce cancer with prolonged exposure? 15. Your pupils dilate when visible light intensity is reduced. Does wearing sunglasses that lack UV blockers increase or decrease the UV hazard to your eyes? Explain. One could feel heat transfer in the form of infrared radiation from a large nuclear bomb detonated in the atmosphere 75 km from you. However, none of the profusely emitted x rays or rays reaches you. Explain. Can a single microwave photon cause cell damage? Explain. In an x-ray tube, the maximum photon energy is given by. Q: Tanning salons claim to use a "safe" form of what light, with a longer wavelength than that in sunlight? Choices: - infrared - microwave - X rays - uv (ultraviolet) A:
uv (ultraviolet)

Answer the following question given this paragraph: Electrons at the outermost energy level of an atom are called valence electrons. They determine many of the properties of an element. That's because these electrons are involved in chemical reactions with other atoms. Atoms may share or transfer valence electrons. Shared electrons bind atoms together to form chemical compounds. Q: What are electrons at the outermost energy level of an atom are called? Choices: - core electrons - ions - shell electrons - valence electrons A:
valence electrons

Answer the following question given this paragraph: This giant Buddha statue, which is a national treasure in Japan, is made of bronze. Bronze consists mainly of copper but also contains some tin. Bronze is an example of a solution. A solution is a type of mixture that has the same composition throughout. Q: What do you call a type of mixture that has the same composition throughout? Choices: - transition - structure - transfusion - solution A:
solution