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natka813 [3]
3 years ago
7

HELP ASAP!!!

Chemistry
1 answer:
sammy [17]3 years ago
8 0

Answer:The answer is number 4 aka 7

Explanation:

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Fluorine-18 is a positron emitter used in pet scans. write a balanced nuclear equation for the reaction.
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3 years ago
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My barometer is reading 1253 torr. What is the pressure in mmHg?
kobusy [5.1K]

Answer:

The pressure in mmHg is 1253 (option C)

Explanation:

Two quantities are directly proportional if when multiplying or dividing one of them by a number, the other is multiplied or divided by that number. In other words, the magnitudes are directly proportional when one magnitude increases and so does the other in the same proportion; or when one magnitude decreases and so does the other in the same proportion.

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In this case, knowing that 1 Torr = 1 mmHg, the rule of three can be applied as follows: if 1 torr is equal to 1 mmHg, 1253 torr is equal to how many mmHg?

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3 years ago
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Xelga [282]

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B. Excited state

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The excited state is any level higher than the ground state. An electron  in an energy level has a definite amount of energy associated with it at that level.

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Thank you for choosing Brainly.

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