Mass Percent Solution-with feedback

What is the percent by mass of a solution made by dissolving 20.0 g of NaCl into 180.0 g of water?

• 10.0 %

• 11.1 %

• 80.0 %

• 20.0 %

Answer explanation

20g / (180g+ 20g) x 100 = 10 %

What is the percent concentration of sugar in pink lemonade if 28 g of sugar is added to 209 g of water?

• 14.7 %

• 5.14 %

• 13.4 %

• 8.47 %

• 11.8 %

Answer explanation

28 g / ( 209g + 28g) x 100 = 11.8 %

The ___ is the part of the solution being dissolved

• solute

• solvent

Answer explanation

The solvent ( usually water) dissolves the solute.

What is the percent by mass of a solution made by dissolving 10.0 g of NaCl into 180.0 g of water?

• 5.26 %

• 5.56 %

• 180.0 %

• 20.0 %

Answer explanation

10 g / (10 g + 180 g) x 100 = 5.26 %

What is the percent by mass of a solution containing 56.5 g of salt in 500 g of water?

• 11.3 %

• 5.56%

• 8.85%

• 10.2 %

Answer explanation

56.5g / ( 56.5g + 500g) x 100 = 10.2 %

Something that is soluble

• can be dissolved
• cannot be dissolved

How does a solution become supersaturated?

• dissolve lots of solvent in it.

• dissolve a little solute in it.

• heat it up, add lots of solute, then cool it down.

• dissolve a super amount of solvent in it.

Answer explanation

A supersaturated solution holds more solute than it should at a cooler temperature. You must heat it up to get it to dissolve all of the solute. Then you cool it down so that it is holding more solute than it should at that cooler temperature.

Tags

NGSS.HS-PS1-5

What type of a solution is 55g KBr at 80ºC in 100g H₂O?

• Saturated

• Unsaturated

• Supersaturated

Answer explanation

The point where 55g meets 80 C is under the line , therefore it is an unsaturated solution.

What type of a solution is 25g NaCl at 70ºC in 100g H₂O?

• Saturated

• Unsaturated

• Supersaturated

Answer explanation

The point where 25g meets 70 C is under the line therefore it is an UNsaturated solution.

Using the solubility curve, decide whether 20g of KClO₃ dissovled in 100g of water at 50°C is saturated, unsaturated or supersaturated.

• saturated

• unsaturated

• supersaturated

Answer explanation

The point on the graph where 20 g meets 50 degrees C is on the line therefore it is a saturated solution.

Tags

NGSS.HS-PS1-5