P.5.5B.1 ELS questions

When salt, sugar, and hot water are stirred together, a ​ (a)   is created because the salt and sugar completely ​ (b)   in the water, changing some of water's properties such as taste.

• solution
• dissolve
• molecule
• mixture
• combine
• oxidize

Tags

NGSS.MS-PS1-2

Which of the following are properties of a solution? (Select two choices)

• always transparent (clear) to light

• can be physically separated

• particles (solute) do not settle

• most solutes can be filtered out of the solvent

• appear cloudy when observed

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

• homogeneous
• compound
• suspension
• heterogeneous

Which statements best describe the properties of substances in a mixture? (Select two choices)

• able to chemically combine

• retains physical properties

• unable to chemically combine

• contains dissolved particles

What is a physical combination of two or more substances that are blended together without forming a new substance?

• distillation

• solute

• mixture

• solvent

Mrs. Sanchez's science class is conducting a mixture and solution lab. Students brought in different items to create their mixtures and solutions. Each group was given a bowl to assemble their items. The table below shows the outcomes of each group.

Match each group with their appropriate mixture.

• Group 2

• Because this mixture contains a liquid, the solids have been completely distributed in the water.

• Group 3

• Because this mixture is the only one that does not contain a liquid, the items are easily separated.

• Group 4

• Because this mixture contains a liquid, the solids are visible at the bottom.

• Group 1

• Because this mixture contains a liquid, one solid will float on top of the water.

Tags

NGSS.MS-PS1-2

Record each example in the column that best identifies it.

Groups:

(a) Mixture

,

(b) Solution

• air

• cereal and milk

• salad

• salt water

A group of students are 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.

A group of students combined peanuts, pretzels, m&m's, and raisins in a bowl. The combination the students created was a(n) ​ (a)   . We know it is this because ​ (b)   .​

• mixture
• each ingredient kept its original properties
• compound
• element
• solution
• a chemical change took place
• the ingredients were unable to be separated
• a physical change took place

Which of the following is an example of a heterogeneous mixture?

(a)  

• Saltwater
• Air
• Milk
• Trail mix