Separation Techniques: Sublimation, Filtration & Evaporation

Which of the following is the BEST definition of sublimation?

Which technique is BEST suited for separating a mixture of salt and sand?

What property of ammonium chloride makes it suitable for separation by sublimation?

During the separation of salt, sand, and ammonium chloride mixture, which component is removed FIRST by sublimation?

Which of the following describes the role of the filter paper in the separation of sand from a salt solution?

In the laboratory procedure for separating ammonium chloride, what is the purpose of the inverted funnel placed over the china dish?

What is the purpose of using a wire gauze between the Bunsen burner and the china dish?

What observation indicates that the sublimation of ammonium chloride is complete?

After separating the components of a salt, sand, and ammonium chloride mixture, where would you find the salt?

What is the primary purpose of evaporation in the context of separating a salt solution?

Why is it important to allow the funnel to cool before removing it in the sublimation setup?

Which of the following is NOT a physical method for separating mixtures?

What does the term 'filtrate' refer to in the context of filtration?

Which of the following mixtures is LEAST suitable for separation by sublimation?

What is the purpose of using distilled water instead of tap water when separating sand and salt?

Which of the following is a characteristic of a mixture, as opposed to a pure substance?

In the sublimation process described, what happens to the kinetic energy of ammonium chloride molecules as they transition from solid to gas?

A student finds that after sublimation, some solid residue remains in the china dish along with the sand. What is the MOST likely explanation?

How does surrounding temperature affect the process of separating salt from water by evaporation?

Which of the following is NOT a real-world application of filtration?

What is the MOST important safety precaution to take during sublimation of ammonium chloride?

Why does salt recrystallize during the evaporation process?

How does the rate of filtration change if the pore size of the filter paper is increased?

In an experiment separating a mixture by evaporation, which factor needs to be MOST carefully controlled to ensure successful separation?

Which technique would be MOST appropriate for separating a mixture of two liquids with significantly DIFFERENT boiling points?

A student wants to separate iron filings from sulfur powder. Which method would be the MOST efficient?

Which statement accurately compares sublimation and evaporation?

A mixture of two solid compounds is heated. One compound sublimes at a significantly lower temperature than the other. However, the temperature is raised too quickly, and as a result, some of the higher sublimation temperature compound is also collected with the first sublimate. Which method would BEST purify the first compound?

Which of the following techniques relies on differences in solubility to separate the components of a mixture?

What is the MOST likely reason a student might obtain a lower-than-expected yield of salt after evaporation?

What is a limitation of using evaporation as a separation technique?

A student performs sublimation on a solid mixture and observes that the collected sublimate is not completely pure but has a slightly different color than expected. What is the MOST probable explanation?

During filtration, a student notices that the filtrate is cloudy instead of clear. What does this indicate?

Given a scenario where a mixture of three substances (A, B, and C) needs to be separated. Substance A is soluble in water and sublimes easily. Substance B is soluble in water but does not sublime. Substance C is insoluble in water and does not sublime. What is the OPTIMAL sequence of separation techniques?

Consider a scenario where you are tasked with separating a very complex mixture containing several components with overlapping properties. Which approach would offer the MOST versatile and comprehensive separation strategy?

A chemist mistakenly uses a filter paper with a pore size significantly larger than is appropriate for the particle size of the solid they wish to filter. Attempting to remedy the situation mid-filtration, which of the following actions would be MOST effective without restarting the entire process?

Which of the following is an example of a mixture?

In the context of separating mixtures, what is the primary difference between filtration and evaporation?

Why is an inverted funnel used during the sublimation of ammonium chloride?

What is the purpose of the wire gauze in the experimental setup for separating a salt, sand, and ammonium chloride mixture?

In the separation of sand and salt, why is the mixture stirred with distilled water?

After dissolving salt in water and filtering the mixture to remove sand, what remains in the filtrate?

In the evaporation technique, what happens to the water molecules as the salt solution is heated strongly?

What remains in the china dish after the evaporation of the salt solution?

Which of the following is a characteristic property of substances that can undergo sublimation?

Why is it important to allow the funnel to cool down after sublimation before collecting the ammonium chloride?

What is the purpose of plugging the stem of the inverted funnel with cotton during sublimation?

Which of the following best describes the role of a glass rod during the filtration process?

In separating a mixture of salt, sand, and ammonium chloride, which property is exploited to separate ammonium chloride?

What is the purpose of using distilled water, rather than tap water, in the separation of salt and sand?

Which of the following is a potential source of error that could lead to an incomplete separation of salt and sand?

During the separation of salt, sand, and ammonium chloride, at what point should the heating for sublimation be stopped?

What is the primary reason salt recrystallizes during the evaporation process?

If a student observes that some solid remains undissolved after stirring the salt and sand mixture with water, what should they do before proceeding with filtration?

How would you determine if the separation of salt from water by evaporation is complete?

A student performs the experiment but forgets to add the wire gauze under the china dish during the sublimation step. What is the MOST likely consequence?

Which of the following actions would MOST effectively improve the purity of the salt obtained after evaporation?

A student observes small black particles in the recrystallized salt after evaporation. Assuming proper filtration, what is the MOST probable source of this contamination?

In a scenario where the ammonium chloride sublimes very slowly, even with adequate heating, what adjustment to the experimental setup would MOST likely increase the rate of sublimation?

During the sublimation process, a student notices condensation forming on the outside of the inverted funnel. What does this indicate?

You are tasked with separating a mixture containing sand, salt, iron filings, and naphthalene. In what order should you perform the separation techniques for optimal results?

When heating the salt solution for evaporation, a strong burning smell is detected. What is the MOST likely cause?

Which modification to the filtration process would MOST improve the speed of filtration of a chalky (cloudy) suspension without sacrificing filtrate clarity?

A student is separating a mixture of salt, sand, and ammonium chloride. They perform the sublimation step, but some of the ammonium chloride remains mixed with the salt and sand. What is the MOST likely reason for this incomplete separation during sublimation?

After performing the filtration step, a student finds that the sand on the filter paper still contains some salt crystals. What is the BEST way to remove the remaining salt from the sand?

During the evaporation of the salt solution, the student notices that the solution starts to bump and splatter. What should the student do to prevent this?

A mixture of three substances (A, B, and C) needs to be separated. Substance A is soluble in cyclohexane and sublimes easily. Substance B is soluble in water but does not sublime. Substance C is insoluble in both cyclohexane and water, and does not sublime. What is the OPTIMAL sequence of separation techniques?

In a scenario where a student wants to recover the water after separating salt from a salt water mixture using evaporation, which additional laboratory equipment would they require?

While performing sublimation, a student notices the formation of a brown, oily substance along with the expected ammonium chloride sublimate. What is the MOST likely explanation for this observation?

A student is trying to separate a very fine powder from a liquid but finds that the particles pass right through the filter paper, resulting in a cloudy filtrate. Which of the following actions would MOST effectively address this issue without completely changing the filtration setup?

You have a solution of salt water that also contains a small amount of dissolved oil. What sequence of steps would be most effective to separate the mixture into its individual components?

Which of the following experimental errors would lead to the MOST inaccurate determination of the mass of salt recovered after evaporation?

A scientist discovers a new solid material that appears to completely disappear when gently heated, leaving no residue behind. However, upon closer inspection using high-powered microscopy, they observe that the 'disappearance' is actually the solid transforming into transparent vapor. Under which category would this phase transition be classified?