150 grams of sugar were dissolved in water at a temperature 40°C. Which of the following would best describe this type of solution?

• unsaturated

• saturated

• supersaturated

Which best describes the result when the concentration of a solution is decreased?

• The amount of solute is increased, and the conductivity of the solution is decreased

• The amount of solute is increased, and the conductivity of the solution is increased

• The amount of the solute is decreased, and the conductivity of the solution is decreased.

• The amount of solute is decreased, and the conductivity of the solution is increased.

Tags

NGSS.HS-PS1-5

Which of the following variables has the most effect on the rate of dissolution of a substance in a container of water?

• the temperature of the water

• the force of the stirring

• The surface area of the substance

• All of the above

Which is the correct set of base properties?

• sweet taste, slippery, changes litmus from blue to red

• bitter taste, slippery, change litmus from red to blue

• sour taste, corrosive, change litmus from blue to red

• sour taste, corrosive, change litmus from red to blue

Which is the correct set of acid properties?

• sweet taste, slippery, changes litmus from blue to red

• bitter taste, slippery, change litmus from red to blue

• sour taste, corrosive, change litmus from blue to red

• sour taste, corrosive, change litmus from red to blue

If the hydroxide ion (OH^-) concentration is greater than the hydronium ion (H₃O⁺) concentration, then the solution is…

• basic

• acidic

• neutral

• salty

If the hydronium ion (H₃O⁺) concentration is greater than the hydroxide ion (OH^-) concentration, then the solution is…

• basic

• acidic

• neutral

• salty

A student recorded the pH of fresh cow’s milk as it sat at room temperature and curdled over a period of 5 days using an electronic pH meter. What does the change in the pH of milk indicate?

• The milk turned more acidic as it curdled

• The milk became neutral as it curdled

• the milk turned more basic as it curdled

• The milk remained the same as it curdled

Tags

NGSS.MS-PS1-2

Four students in a physical science class tested different methods of dissolving laundry soap in water. Each student combines 20 grams of soap with 1000mL of water. The table shows the different methods used by each student.

Which of the following shows the MOST LIKELY order that the students’ laundry soap finished dissolving, from the slowest (last finished) to fastest (first finished)?

• Abdullah --> Darien--> Heather ---> Larissa

• Heather --> Larissa --> Abdullah --> Darien

• Darien --> Abdullah --> Larissa --> Heather

• Larissa --> Abdullah --> Heather --> Darien

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

In the lab situation shown in the table, what color should litmus paper turn when placed in liquid dishwashing detergent?

• red

• blue

• colorless

• pink

Tags

NGSS.MS-PS1-2