Dissolution Rates

In the experiment, the __________ tablet dissolved the fastest because it had the __________. Which terms best complete the sentence?

• whole; highest surface area

• quartered; lowest concentration

• crushed; highest temperature

• crushed; highest surface area

• whole; lowest surface area

Tags

NGSS.MS-PS1-2

Which statement best describes the concentration of the solutions made from the dissolved vitamin C tablets?

• The solution with the whole tablet has the highest concentration because the tablet was in one piece.

• The solution with the crushed tablet has the lowest concentration because the tablet was in many pieces.

• All three solutions had a concentration of zero because the tablets completely dissolved in the water.

• All three solutions have the same concentrations because the amounts of water and solute were the same.

Which two experiments would examine ways to change the rate of dissolution?

• Use crushed, quartered, and whole tablets with varying sizes.

• Use a crushed, quartered, and whole tablet, and measure the amount of water evaporated following heating.

• Use full tablets in each trial but use a different temperature of water for each container.

• Use full tablets in each trial, but increase the amount of water used to dilute the Vitamin C tablet.

• Use full tablets in each trial and stir each tablet a different number of times when dissolving.

Image A and image B show two different substances. Which of the following statements accurately describe the two substances? Choose two answers.

• Images A and B are both composed of carbon and oxygen.

• Images A and B are both molecules containing 2 atoms of oxygen.

• Images A and B are both compounds containing only 2 atoms of oxygen.

• Image A is an element and image B is a compound.

• Image A is a compound and image B is an element.

Tags

NGSS.MS-PS1-1

An antacid is a medication that is used to help calm heartburn. Some antacid tablets contain two compounds that dissolve when the tablet is placed in water. When these compounds dissolve into solution, they react with each other and form two different compounds, one of which is carbon dioxide (CO₂) gas. The person then drinks the dissolved solution. This type of antacid tablet is a __________ that dissolves into the _______, water. This is a __________ change. Once in solution, the _______________ react to form a gas which is evidence of a __________ change. Which terms best complete the sentences?

• solute; molecule; chemical; solvents; physical

• solvent; solute; physical; molecules; chemical

• solute; solvent; physical; molecules; chemical

• solvent; solute; chemical; molecules; physical

• solvent; molecule; physical; molecules; chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Compare the four solutions in the diagram in terms of the amount of solute and the volume of the solutions. Solution ________ is the most concentrated solution. Solution ________ is the most diluted solution. Solution B has the same concentration as solution ________. Which order of letters accurately completes the sentences?

• A. B; A; C

• B. A; D; C

• C. D; A; C

• D. C; B; A

Tags

NGSS.MS-PS1-2

The chemical formulas of three substances are recorded. - C₃H₈O - C₄H₁₀O - C₅H₁₂O These compounds contain the same __________ because each formula has the same __________. They are different compounds because they have different __________. Which terms best complete the sentences?

• elements; chemical symbols; chemical formulas

• molecules; atomic numbers; molecular weights

• atoms; isotopes; electron configurations

• compounds; valence electrons; atomic masses

Tags

NGSS.MS-PS1-1

A student wants to test how temperature affects the speed a solute dissolves in an aqueous solution. The student plans to conduct three trials of the same solute and solvent. The table shows the three trials the student will conduct.

• As the temperature increases, the solute will dissolve slower into the solution.

• As the temperature increases, the solute will not dissolve into the solution.

• As the temperature increases, the solute will dissolve faster into the solution.

• As the time to dissolve increases, the speed at which the solute dissolves will not change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Glucose is a simple sugar with the molecular formula C₆H₁₂O₆. It contains elements that can be found in the Periodic Table. Which option correctly identifies the type and number of each atom found in glucose?

• Glucose contains 24 atoms of carbon, 24 atoms of hydrogen, and 24 atoms of oxygen.

• Glucose contains 6 atoms of carbon, 12 atoms of hydrogen, and 6 atoms of oxygen.

• Glucose contains 6 atoms of carbon and 18 atoms of holmium.

• Glucose contains 12 atoms of cobalt and 12 atoms of hydrogen.

Tags

NGSS.MS-PS1-1

Look at the image. Which labels best complete this diagram?

• 1 = solution, 2 = solvent, 3 = solute

• 1 = solute, 2 = solvent, 3 = solution

• 1 = solvent, 2 = solute, 3 = solution

• 1 = solution, 2 = solute, 3 = solvent