Topic 1 Retest

In the experiment, the ​ (a)   tablet dissolved the fastest because it had the ​ (b)   .

• whole
• quartered
• crushed
• highest surface area
• lowest concentration
• highest temperature

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.

Which of the following statements accurately describes 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 ​ (a)   that dissolves into the ​ (b)   , water. This is a ​ (c)   change. Once in solution, the ​ (d)   react to form a gas, which is evidence of a ​ (e)   change.

• solute
• solvent
• physical
• molecules
• chemical
• solution
• emulsion
• mixture

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 ​ (a)   is the most concentrated solution. Solution ​ (b)   is the most diluted solution. Solution B has the same concentration as solution ​ (c)   .

• D
• A
• C

Tags

NGSS.MS-PS1-2

A glass of lemonade with ice in it sits outside in the Texas summer heat. Before long, the ice begins to melt. Which of the following has occurred? Select two answers.

• The ice has melted, which is a chemical change.

• The ice has melted, which is a physical change.

• The lemonade has been diluted by the water from the melting ice.

• The water from the melting ice has been diluted by the lemonade.

• The water from the melting ice has not diluted the lemonade.

A student wants to test how temperature affects the speed at which 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. What will likely happen during the student’s experiment?

• 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

Glucose is a simple sugar with the chemical 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

NGSS.MS-PS1-5

Erika is making a saltwater solution to remove ice from her driveway. She pours salt into a big bucket of water, but most of it sinks to the bottom. What is the simplest way to get the salt to dissolve?

• Heat the water so the salt dissolves and then cool it back down again.

• Crush the granules of salt into a finer powder.

• Add ice to cool the salt even more so the salt dissolves.

• Stir the solution with a stick so the salt will dissolve.

Tags

NGSS.MS-PS1-4