Representations of Solutions

A beaker of uncovered salt water is left in the lab. What happens to the conductivity after a week?

• The conductivity decreases since the concentration decreases as the water evaporates

• The conductivity increases, since the concentration decreases as the water evaporates.

• The conductivity decreases, since the concentration increases as the water evaporates.

• The conductivity increases, since the concentration increases as the water evaporates.

What happens when KBr is dissolved in water?

• Br - ions are attracted to positive K ions

• Br - ions are attracted to the oxygen atom of water

• K+ ions are attracted to the hydrogen atoms of water

• no attractions are involved

Tags

NGSS.MS-PS1-2

NGSS.MS-PS2-5

What is a substance that is dissolved in another substance? 

• solution

• solute

• solvent

• compound

What is a solvent?

• The substance that does the dissolving in a solution.

• The substance that is being dissolved in a solution.

• The mixing of different substances.

• The process in which neutral molecules lose or gain electrons

Which of the following will conduct electricity when dissolved to make a solution?

• KCl

• NH₃

• CO₂

• C₁₂H₂₂O₁₁

Tags

NGSS.MS-PS1-2

A light bulb connected to two electrodes is immersed in the following solutions. Which one will make the light bulb light up the brightest?

• 1 g of sugar in 1 cup of water

• 1 g of salt in 1 cup of water

• 10 g of salt in 1 cup of water

• 10 g of sugar in 1 cup of water.

Which of the following will produce ions to conduct electricity when dissolved in water?

• CaCl₂

• NH₃

• CH₄

• P₂O₅

Tags

NGSS.MS-PS1-2

Which of the following solutions is concentrated?

• 10 g of sugar in 10g of water

• 10 g of sugar in 20 g of water

• 20g of sugar in 20 g of water

• 20 g of sugar in 10 g of water

A solution with only  a small amount  of solute is called a ______ solution.

• dilute

• saturated

• concentrated

• homogeneous

A ratio comparing the amount of solute to the amount of solution.

• concentration

• solution

• mass

• volume

Tags

NGSS.HS-PS1-5