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Middle School Math
Mathématiques
Middle School Math
Nombres décimaux

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 Name _____________________________ Date ___________________
Nombres décimaux
Complète.

 1 Pure water boils at 100C at sea level. Now you may recall that if a solute is added to water it increases the boiling point slightly. One day, Ryan decided to see if this was really true (he didn't believe it). He added some salt to a beaker of water and used an accurate thermometer to measure the temperature at which the water boiled. He found that the boiling point was raised to100.4C. He had measured the boiling point of pure water earlier and found it to be99.8C by his thermometer. How manyC did the boiling point increase in his experiment?
 2 Two different rocks from near a recent volcanic eruption are compared. Sample A is a rock with a mass of640grams and a volume of325cm3, and sample B has a mass of935grams and a volume of512cm3. Which sample is denser and by how much? Round your answer to the nearest hundredth.
 3 Mr. Jones has to mix a fertilizer solution for his garden. The instructions on the package say to dissolvethree-fourthsof a cup of fertilizer in5gallons of water. He has a40-gallon tank that he pulls with a yard tractor. He only puts35gallons of water in the tank each time. How many cups of fertilizer does he need to add to the tank before filling it with water?
 4 Christopher is late for work. He has to drive his triscooter from his house on Road One to his office on Road Four. The trip is about9km. How long will it take him to get there if his average speed is34km/hr?
 5 A chemistry experiment requires a salt solution. You have just dissolved2.9g of NaCl (salt) in135g of water. What is the final concentration (in g/ml) of your salt solution? Round your answer to the nearest thousandth.
 6 Shelby has to add some medicine to her aquarium. Several fish have a fuzzy growth around their mouths. The medicine bottle says to put0.5ml for every gallon of water in the tank. She has a35-gallon tank. How much medicine should she add?

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