Chemistry 6-10

A class is given four different immiscible "mystery liquids" of different colors by their teacher and are asked to predict the order the liquids would separate into if poured into a graduated cylinder to form a density column. The data collected for each liquid is shown in the table. What is the correct order the student should predict for how the liquids will separate? List the liquids from bottom to top of the density column.

• red, orange, yellow, green

• orange, red, yellow, green

• green, yellow, orange, red

• green, yellow, red, orange

Tags

NGSS.MS-PS1-2

The images above show the buret before the titration begins (left) and at the end point (right). What should the student record as the volume of NaOH(aq) delivered to the flask?

• 5.65 mL

• 6.34 mL

• 31.65 mL

• 37.30 mL

The diagrams above represent solutes present in two different dilute aqueous solutions before they were mixed. Water molecules are not shown. When the solutions were combined, a precipitation reaction took place. Which of the diagrams below is the best particle representation of the mixture after the precipitation reaction occurred?

• Diagram A

• Diagram B

• Diagram C

• Diagram D

Tags

NGSS.HS-PS1-3

You are given 200.0 mL of a 3.0 M solution of KOH. What would be the molarity of the solution if it is diluted with additional solvent to a final volume of 1000. mL?

• 15. M

• 1.7 M

• 0.6 M

• 0.2 M

Which statement below is TRUE?

• Both samples are strong acids due to the donation of hydrogen ions.

• There is no way to determine relative pH from these diagrams.

• H₂CO₃ is a weak acid with a lower pH than the HCl sample.

• HCl is a strong acid with a lower pH than the H₂CO₃ sample.

A student reacts nitric acid (HNO₃) and solid copper (Cu) in a sealed container and leaves it overnight. When the student checks on the container the next day, the solution has turned a green color and a new, red gas has formed above the liquid with some copper remaining in the bottom. The student let it sit overnight again and react for an additional 24 hours, but the extra time did not change the results. What can the student conclude from these results?

• Copper is the limiting reactant.

• Nitric acid is the limiting reactant.

• You cannot determine the limiting reactant with this information.

• The copper is dissolving not reacting, therefore there is not a limiting reactant in this scenario.

Which of the quantities in the energy level diagram below are affected by the use of a catalyst?

• 1, 2, and 3.

• 2 and 3 only.

• 1 and 3 only.

• 1 and 2 only.

Tags

NGSS.HS-PS1-4

During the course of the gravimetric analysis chemical reaction, what happens to the aqueous nitrate (NO₃⁻) ions from the reactant AgNO₃?

• NO₃⁻ ions are combined with and oxidized by M⁺ ions to become the precipitate.

• NO₃⁻ ions are combined with and reduced by M⁺ ions to become the precipitate.

• NO₃⁻ ions form solid MNO₃ that is filtered out before being dried and massed.

• NO₃⁻ ions are a spectator ion in this reaction and therefore remain dissolved in solution after filtering out the precipitate.

Which of the following is the correct name for the compound that would form from Co³⁺ and HCO₃⁻?

• Cobalt bicarbonate

• Cobalt (III) bicarbonate

• Cobalt carbonate

• Cobalt (III) carbonate

A solution is made by adding 60 g of KCl to 100 g of 70°C water. The solution is stirred vigorously and continuously for 10 minutes, and it is assumed all dissolution that could occur at these quantities has finished. No additional steps are taken. Which of the following is TRUE about the ending solution?

• The final solution is supersaturated.

• The final solution is saturated and no undissolved solute is observed in the bottom of the beaker.

• The final solution is saturated and undissolved solute is observed in the bottom of the beaker.

• The final solution is unsaturated.