P.5.5B Formative Review

Megan wants to design an atomic model to represent a mixture. The image shows four different models where each type of foam ball represents an atom. Which model best represents a mixture?

• Model 1 represents a mixture because all atoms are identical and are not joined together.

• Model 2 represents a mixture because the atoms of two different elements are joined together.

• Model 3 represents a mixture because the atoms of two different elements are not joined together.

• Model 4 represents a mixture because all atoms are identical and are joined together.

Tags

NGSS.MS-PS1-1

Jessie knows that a quarter is made of nickel and copper. She can see these two substances in different colored bands on the edge of a quarter. Which best describes why Jessie can see the bands of nickel and copper on the edge of the quarter?

• because the copper and nickel formed a new element

• because the copper dissolved into the nickel

• because the quarter is a mixture

• because the quarter is a metal

A teacher pours 6mL of clear liquid into a glass and then adds a spoonful of salt. The teacher stirs the liquid and asks a student to make observations. The student observes that the salt particles disappear. The teacher then asks the student to write a description and classify the new liquid. What is the most appropriate classification for the new liquid?

• The liquid is a solution because the salt dissolves in the water.

• The liquid is a mixture because the salt dissolves in the water, and the water becomes cloudy.

• The liquid is a solution because the salt particles are visible in the water, and the water becomes cloudy.

• The liquid is a mixture because the salt particles are visible in the water, and the water becomes cloudy.

Tags

NGSS.MS-PS1-2

Which image describes what we would see in a heterogeneous mixture?

• 
• 

Vinegar and water are placed in a container and stirred. What is formed when they are mixed?

• gas

• solid

• solution

• compound

Tags

NGSS.MS-PS1-2

Four students write explanations for how concentration in solutions is measured, as shown in the table. Which student has the best explanation of how concentration is measured?

• Student P

• Student Q

• Student R

• Student S

A student made a pitcher of lemonade. How can the student dilute the lemonade if the taste is too sweet?

• 
  Add more sugar.

• Add more water.

• 
  Boil the lemonade.

• 
  Shake the lemonade.

During an activity, a student prepares a sugar solution by dropping five sugar cubes in a glass of water. How would the concentration of the solution change if one more sugar cube is added to the solution?

• 
  The concentration would increase because the quantity of solute in the solution increases.

• The concentration would decrease because the quantity of solute in the solution increases.

• The concentration would increase because the quantity of solvent in the solution increases.

• The concentration would decrease because the quantity of solvent in the solution increases.

This table shows different salt solutions. Which solution is most concentrated?

• Solution #1

• Solution #2

• Solution #3

• Solution #4

Which image describes what we would see in a homogenous solution?

• 
•