Solutions, Acids & Bases Mastery Check

Solutions, Acids & Bases Mastery Check

By Katelyn Waldron

Poll

How was the Mastery Check?

• We had a mastery check?

• Eh. I could have done better.

• I did great! I'm ready for the test.

• ...let's not talk about it. I have a lot to review.

Multiple Choice

If more salt was added to an unsaturated saltwater solution, how will the concentration of the solution change?

• The concentration of the solution will decrease because the salt was added; this resulted in a smaller volume of solution.

• The concentration will first increase then decrease because both the salt and the water evaporated; first, only the water evaporates, but later, the salt also begins to evaporate.

• The concentration of the solution will increase because the slt was added; this resulted in a solution with the larger amount of salt but a same volume of water.

• The concentration of the solution stays the same because the salt evaporated with the water; this resulted in a solution with the same mass of solute per unit volume of solvent.

Multiple Choice

DeYon wants to test the conductivity of each solution. Prior to carrying out the investigation, he needs to identify the variables being controlled and the variables being changed between the two solutions. Which identification of the variables is correct?

• The volume of the solution and the concentration of the solution are being changed between the two solutions, but the number of solute particles is being held constant

• The volume of the solution and the number of solute particles are being changed between the two solutions, but the concentration of the solution is being held constant.

• The number of solute particles is being changed between the two solutions, but the volume and concentration of the solution is being held constant.

• The number of solute particles and the concentration of the solution are being changed between the two solutions, but the volume is being held constant.

Multiple Choice

Dr. Gyorgyi is investigating which type of medicine delivery system, a solid pill or a scoop of powder, would relieve pain faster. Which hypothesis should Dr. Gyorgyi develop given prior knowledge about surface area?

• Powders have more surface area and will dissolve in the bloodstream faster

• Powders have less surface area and will dissolve in the bloodstream faster

• Tablets have more surface area and will take longer to dissolve into the bloodstream

• Tablets have less surface area and will enter the bloodstream without dissolving

Multiple Choice

Where should you keep your glass of soda if you want it to remain fizzy?

• On the counter so that the warmer temperature can allow the gas to remain dissolved within the liquid of the soda more easily.

• On the counter so that the warmer temperature can allow the liquid of the soda to remain dissolved within the gas more easily.

• In the refrigerator so that the colder temperature can allow the gas to remain dissolved within the liquid of the soda more easily.

• In the refrigerator so that the colder temperature can allow the liquid of the soda to remain dissolved within the gas more easily.

What factors affect solubility?

Think about...

Surface Area

Temperature

Saturation

Agitation ​

What other factors can you tthink of?

Multiple Choice

• I, III, and V

• II, III, and V

• II, III, and VI

• I, IV, and V

Multiple Choice

What is the solubility of KNO3 in 100g of water at 60℃?

• 28 grams / 100g of H₂O

• 38 grams /100g of H₂O

• 45 grams/100g of H₂O

• 108 grams/100g H₂O

Multiple Choice

How much sodium nitrate, NaNO3 , would completely dissolve in 100g of water at 60℃?

• 0 grams

• 44 grams

• 108 grams

• 126 grams

Multiple Choice

Based on the solubility curve of carbon dioxide, which statement would not be accurate about soda?

• Cold soda will taste more bubbly because the solubility of carbon dioxide in water is higher at lower temperatures.

• Cold soda will taste less bubbly, because the solubility of carbon dioxide in water is lower at lower temperatures.

• Warm soda will taste more bubbly, because the solubility of carbon dioxide in water is higher at higher temperatures

• Warm soda will taste less bubbly, because the solubility of carbon dioxide is lower at higher temperatures.

Multiple Choice

Ammonia (NH3 ) dissolved in water is heated in a beaker. Initially there 60 grams were dissolved in 100 grams of water. What would happen if the temperature reached 90℃ and why?

• about 50 more grams of ammonia would be able to dissolve as the increase in temperature caused the solubility to decrease.

• about 50 grams of ammonia would come out of solution as the increase in temperature caused the solubility to increase.

• about 50 more grams of ammonia would be able to dissolve as the increase in temperature caused the solubility to increase.

• about 50 grams of ammonia would come out of solution as the increase in temperature caused the solubility to decrease.

Multiple Choice

From the ions listing, which would be a part of an acid?

• carbonate ion (CO₃^2-)

• hydrogen ion (H⁺)

• phosphate ion (PO₄^3-)

• hydroxide ion (OH^-)

Multiple Choice

Which statement below would be the best explanation for how students should categorize the solutions?

• Solutions W and Y must be acids since they both conduct electricity very well. Solution X is neutral since it does not conduct electricity. Solution Z is a base since it is a weak conductor of electricity.

• Solutions W and Y are very strong solutions since both conduct electricity well. Solution W is a strong base since litmus paper turned blue. Solution X is neutral since litmus paper didn’t change. Solutions Y and Z are acids since litmus paper turned red.

• Solutions W and Y are very strong solutions since both conduct electricity well. Solution W is a strong acid since litmus paper turned blue. Solution X is neutral since litmus paper didn’t change. Solutions Y and Z are bases since litmus paper turned red.

• Solution W is a strong base since is conducts electricity well and turned litmus paper blue. Solutions X and Z are neutral since they don’t conduct electricity well or at all. Solution Y is a strong acid since it conducts electricity well and turned litmus paper red.

Multiple Choice

Chloe wants to classify household chemicals by testing them using litmus paper. If she is going to classify these chemicals correctly, which statement will best help her determine if the chemicals are acids or bases?

• if blue litmus paper turns red, the substance has a pH below 7 and is a base

• if blue litmus paper turns red, the substance has a pH above 7 and is a base

• if blue litmus paper turns red, the substance has a pH below 7 and is an acid

• if blue litmus paper turns red, the substance has a pH above 7 and is an acid

Multiple Choice

Click on the image to read the question.

• She should mix substance A, lemon juice, with substance C, ammonia. She should mix substance B, milk of magnesia, with substance D, black coffee.

• She should mix substance C, lemon juice, with substance A, ammonia. She should mix substance D, Milk of Magnesia, with substance B, black coffee.

• She should mix substance A, lemon juice, with substance B, Milk of Magnesia. She should mix substance C, ammonia, with substance D, black coffee.

• She should mix substance C, ammonia, with substance B, Milk of Magnesia. She should mix substance D, black coffee, with substance A, lemon juice

Multiple Choice

What is the factor that affects the rate of dissolving by increasing the exposed parts of the solute?

• surface area

• temperature

• agitation

Multiple Choice

Which of the following BEST describes the type of chemical this model represents?

• This molecule is an acid as it can release a hydrogen ion.

• This molecule is a base because it releases oxygen ions.

• This molecule is a base as it increases the concentration of hydrogen ions.

• This molecule is an acid because it increases the concentration of OH ions.

Multiple Choice

Leonard adds 5 grams of sugar to 1 liter of water to make one sugar solution. Then he adds 10 grams of sugar to 1 liter of water to make another sugar solution. Which statement correctly compares these solutions?

• The solution with 10 grams of sugar has less water than the solution with 5 grams of sugar.

• The solution with 10 grams of sugar is more concentrated than the solution with 5 grams of sugar.

• The solution with 5 grams of sugar is more concentrated than the solution with 10 grams of sugar.

• The solution with 10 grams of sugar has the same concentration as the solution with 5 grams of sugar.

Multiple Choice

Next, Curtis uses the universal indicator to test bleach, and the results show a purple color. Using the data from the table, classify bleach as an acid or a base.

• The color indicator shows that bleach has a pH below 7, so it is an acid.

• The color indicator shows that bleach has a pH below 7, so it is a base.

• The color indicator shows that bleach has a pH above 7, so it is an acid.

• The color indicator shows that bleach has a pH above 7, so it is a base.

Multiple Choice

Why is saltwater a conductor of electricity?

• Saltwater has many free ions

• Saltwater has no free ions.

• Saltwater has many dissolved pollutants

• Saltwater has few dissolved pollutants.