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Monday, February 24 Please take out your Ch. 7 social studies packet and begin working on #17-28. Today’s Schedule: Science Jeopardy review and completing study guide

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**Investigation 3 Concentration**

Final Jeopardy Grab Bag #1 Grab Bag #2 Grab Bag #3 10 20 30 40

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Solubility is the amount of ________ (solid) that will dissolve in a given amount of ________(liquid) solute; solvent Grab Bag #1 10

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**Can a cup of salt and water be both a mixture and a solution? Explain.**

Yes, mixtures are two or more things mixed together. Salt and water also make a solution when the salt dissolves. All solutions are mixtures! Grab Bag #1 20

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**Marissa, Paige, and Jacob each used 3 scoops of Epsom salts to make solutions.**

Marissa made her solution using 1000ml of water, Paige used 500ml of water, and Jacob used 250ml of water. List the solutions (by student name) in order of concentration. Jacob, Paige, Marissa Grab Bag #1 30

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**Describe how salt and water can be separated**

Describe how salt and water can be separated. Include what will happen to the salt and to the water. They can be separated by evaporation. The water will go into the air, and the salt will be left in the container. Grab Bag #1 40

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**Mercedes made a solution using 30 grams of salt in 200ml of water. **

Grab Bag #2 10 Mercedes made a solution using 30 grams of salt in 200ml of water. What should Mercedes add to this solution to make a solution that is half as concentrated? 30 grams of salt 15 grams of salt 200 ml of water 100 ml of water

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Grab Bag #2 20 Gracie made a saturated solution by adding a solid to 50ml of water. Drew made a saturated solution by adding the same solid to 200ml of water. Do the two saturated solutions have the same concentration? Explain your answer. Both solutions are saturated and cannot get any more concentrated, so they have the same concentration.

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Grab Bag #2 30 Tyler is trying to understand how the concentration of a saltwater solution changes as he adds salt. Describe how the concentration changes with each spoon of salt added after the solution becomes saturated. The concentration of the solution does not change after it reaches saturation, no matter how much salt is added.

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**Which solution is the most concentrated and how do you know?**

Grab Bag #2 40 Solution 1 150ml of water 6 spoons of solid Solution 2 100ml of water 4 spoons of solid 50ml of water 3 spoons of solid Solution 3 Which solution is the most concentrated and how do you know? Solution 3, because concentration is a comparison of the amount of solid to the amount of liquid. -Solution 1 has 2 spoons per 50ml of water -Solution 2 has 2 spoons per 50ml of water -Solution 3 has 3 spoons per 50ml of water

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**Mercedes made a solution using 30 grams of salt in 200ml of water. **

What should Mercedes add to this solution to make a solution that is twice as concentrated? 100 ml of water 200 ml of water 15 grams of salt 30 grams of salt Grab Bag #3 10

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**Tyler is trying to understand how the concentration of a saltwater solution changes as he adds salt.**

Describe how the concentration changes with each spoon of salt added before the solution becomes saturated. The concentration of the solution increases with each addition of salt. Grab Bag #3 20

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Solution A 4 spoons solid, 100 ml water Clear; no material on bottom Solution B 2 spoons solid, 50ml water Clear; no material on bottom If you would weigh 50ml of solution from each one, would one weigh more than the other or would they be equal? Explain. The solutions have the same concentration (2 spoons in 50ml = 4 spoons in 100ml), so the masses would also be the same. Grab Bag #3 30

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Cup 2 3 spoons solid, 50ml water Clear; material on bottom Cup 1 4 spoons solid, 50 ml water Clear; material on bottom How would you describe the concentrations of the two solutions? Explain your answer. They have the same concentration because both solutions are saturated even though cup 1 has more spoonfuls. Grab Bag #3 40

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Final Jeopardy Gracie made a saturated solution by adding a solid to 50ml of water. Drew made a saturated solution by adding the same solid to 200ml of water. Write a plan for an investigation Gracie and Drew could conduct to tell whether the solutions have the same concentration.

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**Measure equal amounts of each solution into separate cups. **

Final Jeopardy Answer Write a plan for an investigation Gracie and Drew could conduct to tell whether the solutions have the same concentration. Measure equal amounts of each solution into separate cups. Weigh the cups against each other. If the cups balance is equal, the solutions are the same concentration. If one weighs more, than the heavier solution is more concentrated.

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**Final Jeopardy Alternate Answers**

Measure equal amounts of each solution into separate cups. Weigh each cup’s solution in grams. The heavier one is more concentrated. Or Measure equal amounts of each solution into separate cups. Let both cup’s water evaporate. The heavier crystallized solid that is left is more concentrated.

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