Solute and Solvent review

Holly stirred 2 liters of water with 3 packets of lemon flavoring.  When Holly tasted the solution, it was too sour.  In order to decrease the concentration of lemon flavoring in her solution, Holly will need to

• stir the solution harder

• add more lemon flavoring

• add more water

• filter out the lemon flavoring

Choose a word from the drop-down menu to complete the sentence below. 

Solutions are  mixtures of two or more substances that spread out evenly and do not settle at the bottom of a container. 

• compound

• homogenous 

• suspension

• heterogenous

Read the following sentence and answer the question that follows. (2 points)

A student wants to change the concentration of a solution.  She has the following supplies available to her: solvent, solute, an extra container of the solution, and a container of a second solution with more solvent.

Which of the following actions would DECREASE the concentration of the initial solution?

• Mix the first solution with the second solution.

• Add more solute to the first solution.

• Add more solvent to the first solution.

• Remove half of the first solution.

When salt, sugar, and hot water are stirred together, a 

is created because the salt and sugar completely

in the water, changing some of water's properties such as taste.

• solution

• mixture

• combine

• dissolve

Tags

NGSS.MS-PS1-2

Choose an option from the drop-down menu to complete the sentence below.

A solution is a type of homogeneous (same)  made up of two or more substances.

• atom

• element

• solute

• mixture

A group of students is exploring the properties of substances in mixtures and solutions as part of a STEM activity.  The students place a teaspoon of sand in a 100ml beaker of water and stir briskly for one minute.  Next, the students add a teaspoon of salt (NaCl) to another 100ml beaker of water and stir briskly for one minute.  After 30 minutes, the students observe the two beakers of water.  Which conclusion would they be most likely to make based on their observations?

• The sand and salt both dissolved completely in the water and no particles of either could be observed.

• The salt dissolved and was no longer visible, but the sand had settled to the bottom of the beaker.

• The majority of both salt and sand dissolved, but some salt or sand could be seen on the bottom of each beaker.

• The salt settled at the bottom of the beaker, but the sand was completely dissolved and could not be seen.

Tags

NGSS.MS-PS1-2

Ocean water contains dissolved salt (NaCl); however, it is possible to separate the salt from the water.

Which technique would be the BEST way to separate the salt from the water? 

• Filter the salt out of the water with filter paper.

• Sift the salt out of the water with a kitchen strainer

• Apply heat to evaporate the water leaving the salt.

• Use a magnet to attract the salt molecules

Tags

NGSS.MS-PS1-4

Which scenario will the sugar dissolve the quickest?

• A cube of sugar is poured into cool water

• Granulated sugar is poured into warm water.

• A cube of sugar is stirred in hot water.

• Granulated sugar is stirred in hot water.

Tags

NGSS.MS-PS1-4

Dimitri combined some substances. He made a list of the substances he combined.
Which combination is a solution?

• Combination 1

• Combination 2

• Combination 3

• Combination 4

Tags

NGSS.MS-PS1-2

A student poured some sugar into a glass of water. After the water was stirred, no solid sugar remained in the glass. Which statement BEST describes what happened?

• The sugar reacted with water to form elements.

• The sugar reacted with water to form a mixture.

• The sugar dissolved in water to form a solution.

• The sugar dissolved in water to form compounds.