Experiment 8 Pre-Assessment

What is the purpose of Experiment #8?

• To measure the amount of nitrogen in plant food.

• To determine the percentage of phosphorus in plant food.

• To analyze the color of plant food.

• To calculate the percentage of potassium in plant food.

Which reaction will occur during the experiment?

• Precipitation of nitrogen gas.

• Formation of magnesium ammonium phosphate hexahydrate.

• Formation of potassium oxide.

• Decomposition of plant food into nitrogen and potassium.

Tags

NGSS.MS-PS1-2

Why should the reactions be performed in the fume hood?

• To avoid contamination.

• Because the ammonia has a strong odor.

• To prevent the reaction from evaporating.

• To keep the temperature constant.

Tags

NGSS.HS-ETS1-3

What is the main safety concern when handling ammonia?

• It is highly flammable.

• It is corrosive and should be handled in the fume hood.

• It reacts explosively with water.

• It produces toxic fumes when mixed with acids.

Why is it important to seat the filter paper in the Buchner funnel before filtering?

• To increase the surface area.

• To prevent the paper from curling and to ensure proper filtration.

• To allow the liquid to pass through faster.

• To measure the mass of the paper.

Why should you store the petri dishes uncovered after the reaction?

• To prevent contamination.

• To allow the product to fully dry.

• To avoid reactions with air.

• To prevent evaporation.

What should you do if the filter paper dries out during filtration?

• Proceed with the filtration.

• Wet the filter paper again.

• Change the filter paper.

• Increase the vacuum.

When transferring the reaction product to the filter, how should you pour it?

• Pour it directly into the center of the filter.

• Pour it down the side of a stirring rod to avoid disturbing the filter paper.

• Pour it as quickly as possible.

• Pour it slowly without a stirring rod.

What should you do after weighing the dry filter paper with the precipitate?

• Store it for future use.

• Record the mass and throw the filter paper and product into the trash.

• Reuse the filter paper for the next experiment.

• Wash the filter paper.

Which of the following should you neutralize before pouring it down the drain?

• The filter paper.

• The ammonia solution.

• The filtrate from the filter flask.

• The petri dish.