Solutions and Solubility

What effect is seen on a reaction (dissolution) when the temperature is increased?

• It decreases the rate of reaction.

• It increases the rate of reaction.

• It has no effect on the rate of reaction.

• It stops the reaction completely.

Tags

TX.112.44.C.7.F.

Which factor does NOT affect the rate of dissolving a solute in a solvent?

• Particle size

• Stirring

• Color of the solute

• Temperature

Tags

TX.112.44.C.7.F.

If you observe that a sugar cube dissolves faster in hot water than in cold water, what question could you ask to further investigate this phenomenon?

• Why does sugar taste sweet?

• How does temperature affect the dissolving rate of sugar?

• What is the color of the sugar cube?

• How much sugar is in the cube?

Tags

TX.112.44.C.1.A.

Which of the following procedures would best help you determine the effect of particle size (surface area) on the rate of dissolving?

• Measuring the temperature of the solution.

• Using different sizes of the same substance (like Alka seltzer tablets) and measuring the time taken for the reaction to complete.

• Changing the color of the reactant.

• Observing the reaction without any changes.

Tags

TX.112.44.C.7.F.

A student observes that stirring a solution speeds up the dissolving process. What could be a possible explanation for this observation?

• Stirring increases the temperature of the solution.

• Stirring increases the surface area of the solute.

• Stirring decreases the concentration of the solution.

• Stirring increases the interaction between solute and solvent particles.

Tags

TX.112.44.C.7.F.

Which of the following is a simple procedure to determine the effect of temperature on the rate of dissolving?

• Measure the mass of the solute before and after dissolving.

• Use a thermometer to measure the temperature of the solvent before adding the solute.

• Dissolve the solute in solvents at different temperatures and measure the time taken for complete dissolution.

• Observe the color change of the solution.

Tags

TX.112.44.C.7.F.

Which question best matches the observation that dissolving happens faster when the reactant (solute) is in powdered form?

• How does the color of the reactants affect the reaction rate?

• What is the effect of particle size on the rate of reaction?

• Why do powdered reactants have a different smell?

• How does the shape of the container affect the reaction?

Tags

TX.112.44.C.1.A.

Which of the following actions will NOT increase the rate of dissolution (dissolving)?

• Stirring the solution

• Decreasing the temperature

• Increasing the surface area of the

  solute

• Increasing the temperature

Tags

NGSS.HS-PS1-5

What factors can affect the rate of dissolution of a solute in a solvent? (Pick 2)

• Color and taste

• Temperature and surface area

• Smell and viscosity

• Agitation and concentration (amount)

Choose all the ways to increase the rate (speed) of dissolving.

• Cool the solute

• Stir the solution

• Break apart the solute

• Heat up the solvent

• Cool the solvent