Foss: Mixtures and Solutions Investigation 3

What is one way you could determine which solution has the greatest concentration and density?

• A. Use a balance with equal volumes

• B. compare the ratios from each solution

• use a straw base to layer the salt solutions

• both answers A and B

Tags

NGSS.MS-PS1-2

Which solution is most concentrated?

• They all have the same concentration.

• Solution 1

• Solution 2

• Solution 3

Tags

NGSS.MS-PS1-2

Which solution has a ratio of 4:25?

• Solution A

• Solution B

• Solution C

• Solution D

Which solution is most concentrated?

• Solution A

• Solution B

• Solution C

• Solution D

Tags

NGSS.MS-PS1-2

A student makes two solutions.

• Solution 1 = 50mL of water and 24g of solid.
• Solution 2 = 100 ml of water and 24g of solid.

She puts the two cups on either side of a balance to find out which solution is more concentrated.

What is wrong with this student's procedure?

• She should have evaporated the liquids before weighing them.

• She should have compared equal volumes of the two solutions.

• She should have used different solids to make the solutions.

• She followed a procedure to determine density, not concentration.

Which of the four solutions has a ratio of 2:30?

• Solution 1

• Solution 2

• Solution 3

• Solution 4

Which of the four solutions is the most concentrated?

• Solution 1

• Solution 2

• Solution 3

• Solution 4

A student makes two solutions with citric acid and 100mL of water. Both are clear and have no solid on the bottom. The student puts 50mL of one solution in "Cup S" and 50mL of the other solution in "Cup T."

True or False: Based on the picture, 50mL of "Solution S" is more dense than 50mL of "Solution T."

• True

• False

Ocean water (salt water) and river water (water with very little salt) mix near the mouth of a river. When the water from the two sources meet, the river water layers on top of the ocean water. Select ALL of the choices that explain this.

• The salt concentration in the ocean water is LOWER.

• Higher salt concentration means that ocean water is MORE dense than river water.

• Solutions that are LESS dense float on solutions that MORE dense.

• Density causes the layering effect.

A solution was made with 200g of Epsom salts and 2,000mL of water. Another container of water had 5,000mL of water in it. How much Epsom salts would need to be added to make a solution of the same concentration?

• 200g

• 2,000g

• 500g

• 500mL