Chemistry 12: College Preparation Unit 1 Self Quiz - 1.8

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Chemistry 12: College Preparation Unit 1 Self Quiz - 1.8 - 1.10

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	1.	MRI stands for___________________________________. It is a medical procedure that uses ____________________ waves and ____________________. By manipulating the ____________________ atoms in the human body, a detailed image of the desired area is produced. When a magnetic field is applied, the hydrogen protons face either the north or south pole of the magnet of the MRI machine. When ____________________ energy is applied, the hydrogen atoms absorb this energy and spin. When the energy source is removed, the hydrogen atoms ____________________ the excess energy they absorbed. This energy is detected, producing an image. In Ontario, there are currently ____________________ MRI clinics. A person who operates an MRI machine is known as a(n) ___________________________________.
Short Answer
	2.	Canadian currency has numerous security features that help to deter the production of counterfeit banknotes. One of these features causes certain parts of a genuine banknote to fluoresce under ultraviolet (UV) light. a. Explain why some parts of a genuine banknote fluoresce while other parts do not. b. Describe what happens at the atomic level when a substance fluoresces under UV light. c. Testing for fluorescence is a qualitative analysis technique. What other security features of Canadian currency allow qualitative analysis procedures to be used to determine whether or not a banknote is genuine?
	3.	a. Name two processes that can weaken a concrete structure. b. How is the damage by each of these processes detected?