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Les nombres entiers
Mathématiques
Middle School Math
Les nombres entiers

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Complète.

 1 The melting point of trifluoroacetophenone is-40C. The melting point of 4-nitroacetophenone is81C. Another similar compound melts at-40C. What is the average melting point of the compounds?
 2 Ryan prepares an ice bath to cool a beaker of reagents. It is rather warm in the room that day (27C), and the beaker begins to cool at a rate of-6C per minute. At that rate how long will it take the beaker to get to2C?
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 4 Acetylene is a flammable gas used in welding. The boiling point of acetylene is-84C. If a sample of acetylene was cooled to20C below its boiling point (where it would become a solid), what would its temperature be?
 5 If a dense plastic block is dropped into a tank of water, it experiences a change in velocity of-8m/s. If the original velocity was22m/s, what was the velocity immediately after it hit the water?
 6 The water potential in one plant cell was calculated to be-4bar. The water potential in another cell was found to be-10bar. What was the difference in water potentials? Note: the bar is a pressure unit equal to about 14.5 PSI.

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