1. Why do certain components move further on the stationary phase than others? 2. Why was it important to have a wick and to keep the beaker covered with foil while the samples were developing?
Q: Why would industry prefer to purify solids by sublimation or zone refining rather than…
A: The advantage of sublimation for purification process are i) Minimum amount of product is lost. ii)…
Q: In thermal analysis methods. Is the thermocouple for measuring sample temperature immersed directly…
A:
Q: Taylor was harvesting her beautiful, pure crystals via vacuum filtration from a methanol/water mixed…
A:
Q: What is the best technique for pushing down on the plunger to carefully form a drop? Select the most…
A: To decribe the best technique for pushing down the plunger to carefully form a drop.
Q: What are the physical states of dispersed phase and dispersion medium in foam rubber.
A: A phase is the state of a system. Phase can be solid, liquid and gas. When the solution forms…
Q: Please draw out the apparatus illustration for normal distillation and key points in this process
A: Please find your solution below : The apparatus illustration of normal distillation process is as…
Q: A sample of benzoic acid is contaminated with methyl red, a compound that is soluble in cold water.…
A: Gravity filtration only runs from the help on gravitational force , so no other external stimuli is…
Q: In paper chromatography, the stationary phase is made of ---------- and the mobile phae is made of…
A: A paper chromatography variant, two-dimensional chromatography involves using two solvents and…
Q: Having too much sample can cause an inaccurate melting point .under these circumstances how will the…
A: Melting point is the temperature at which the substance in solid phase changes to liquid phase as…
Q: Which part of the distillation set-up should the water inlet properly be situated? refer to the…
A: Explanation : Name of set up Distillation process, A) Thermometer B) Water outlet C) Cooling…
Q: Determine the moisture content of the crystalline solid that weighs 4.8756g after staying in the…
A: In the given question we have to calculate the moisture content in the solid. given data: wet…
Q: true or false A desirable solvent should be highly pure, commercially available, low viscosity and…
A: The given statement is " A desirable solvent should be highly pure, commercially available, low…
Q: os the enrgy cost to break IMFs for acetone to mix with water likely larger or smaller?
A: We found generally that acetone evaporates much more quickly than water, suggesting that the IMFs…
Q: Why is important to add a spin bar, spin vane or boiling stones to a mixture to be heated? These…
A: Bumping of solution result in loss of solution.
Q: 7) Calculate the viscosity (micropoises) of molecular oxygen at 273.2 K and 1 bar. The molecular…
A: From given data's Initially we are calculating mass of molecule of oxygen and then using viscosity…
Q: How Vickers hardness test is different from other hardness tests? 2- How to measure Vickers…
A: Hardness is the property of material surface resistance to abrasion and indentation. To measure the…
Q: Which of the following actions would increase foam fractionator efficiency? Lowering salinity (such…
A: The correct option is as follows:
Q: Relative amounts of fluid given off and reabsorbed by a model capillary, and what compensates for…
A: Along with oxygen transport, blood also helps in the transport of nutrients, wastes and other…
Q: Having too much sample can cause an inaccurate melting point under these Sir how will the observed…
A: If heating occurs too quickly, the material cannot reach thermal equilibrium. Pure substances melt…
Q: Describe the phenomena used for stabilization of emulsion and suspension?
A: As mentioned, emulsions are stabilized with surfactants (emulsifying agents) that have affinities…
Q: If the scale-pan of weighing balance is not well cleaned during preparations, it could lead to the…
A: 1. Cross contamination is correct answer .
Q: Pipetting is much easier when the top of the pipette and the bulb are: Select one: a. Filled with…
A: Pipette is a laboratory tool commonly used in chemistry
Q: Sol Gel Aerosol Emulsion Foam Solid in Liquid Liquid in Gas Liquid in Solid
A: The mixtures given are,
Q: Q1:What effect would each of the following have on the observed melting point and melting point…
A: a) a thick walled tube may show an increased melting point for your sample.The melting point range…
Q: Filter paper can be added to the developing chamber to help saturate the chamber with solvent vapor.…
A: Answer: True Thin-layer chromatography is a technique for separating a sample into its component…
Q: Complete the profile solid A E GAS D And the processes lavulved
A: Matter is anything that has mass and volume, which exist in material word. Three types of matter are…
Q: Briefly explain why it is important to use crucible tongs when you transfer the heated crucible (a)…
A: (a) It is very important to use crucible tongs when you transfer the heated crucible, why because…
Q: Explain the difference between constant rate filtration and constant pressure difference filtration…
A: Answer - According to the question - Given - filtration - Filtration is a physical separation…
Q: Vacuum filtration is just one method that can be used to separate the components of a mixture.…
A: We have to suggest a separation method that is more efficient than vacuum filtration. There are many…
Q: A glass windowpane with a thin film of water on it reflects less than when it is perfectly dry. Why?
A: reflection is the change in direction of wave or light when it passes from one medium to another…
Q: What is the role of collectors in Froth Floatation process?
A: Various processes are used for extraction of minerals. These minerals are very useful for…
Q: Are there any alternatives for a rotary evaporator?
A: Rotary evaporator is an equipment used in chemical laboratories to separate the solvents and the…
Q: Give a brief introduction on the following topic i.e. (solids: recrystallization and melting points…
A: A question based on analytical process that is to be accomplished.
Q: What is the purpose of the layer of sand at the top of the column? To protect the top of the packing…
A: Sand is added on the top of the column (above silica layer) so that when the sample is applied, the…
Q: how temporary hardness of water can be removed?
A: Hardness in water is due to the presence of concentration of magnesium and calcium…
Q: Why is it necessary to immerse the flask both in hot and cold water for 5 minutes before taking the…
A: Accuracy is how close a value is to its true value. The accuracy is a measure of the degree of…
Q: Why do we heat our hydrate samples to a constant weight?
A: Hydrated sample, means that the compound is not pure, it is hydrated or is having water molecules…
Q: After vacuum filtration why is it important to allow the product to sit out for a few days before…
A: The separation of solids from liquids by passing the mixture through a filter and where, on one…
Q: Anion Test - Nitrate (NO3‾) Procedure : Mix H2SO4 4 M into 5 drops of NO3‾ solution (NaNO3 0.5 M)…
A: The confirmatory test for the NO3- ion depicted here is the brown ring test. In this test FeSO4 is…
Q: How does the melt temperature of the main phase affect diffusion?
A: The entropy of fusion and the melting temperature have a governing influence on the self-diffusion…
Q: When checking the melting point of your impure sample, what temperature should you set as the…
A: Let's say the melting point of the pure sample is 'x0 C'
Q: There are many opportunities during a recrystallization to lose crystals. How could you improve your…
A: Interpretation- How we can improve the percent recovery of recrystallization to lose crystals .…
Q: It is preferable to use the conical beaker for the crystallization process
A: Beakers (cylindrical) have a very wide surface area, which allows hot liquids to evaporate more…
Q: Why should you heat the sample to constant mass?
A: Heating the sample to a constant mass plays an important role in the gravimetric technique. It…
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- . When checking the melting point of your impure sample, what temperature should you set as thestarting temperature (the SET temperature) and what should the ramp rate be?Describe how to weigh hygroscopic solids.1. How to collect main batch of crystals using vacuum filtration (Set-up, things to remember)• Why use small amounts of cold water for washing? What is being washed away (2things)?2. Why measure the volume of mother liquor in a graduated cylinder?3. How to let the main batch of crystals dry/how will they be stored until next week?4. How to collect the small amount of crystals from step 4 (those that were not subjected tocrystallization)• What can we expect of this small batch of crystals compared to the main batch?
- Volumetric pipettes are designed to deliver a precise amount of liquid, but only if you a. submerge the end of the pipette into a solution you are delivering. b. allow the pipette to drain freely, and leave any residual solution in the pipette. c. hold the pipette at a 45 degree angle and ensure that all the liquid is delivered.1. What is the limitation of the sublimation laboratory technique? 2. When can sublination be applied as a process of separation?Why viscosity of fluid affect the capillarity height?
- Briefly explain why it is important to use crucible tongs when you transfer the heated crucible (a) from the clay triangle to the heat-resistant matWhich of the following are safe and effective techniques for drying organic solids recovered from a filtration? (Choose all that apply). a. Spreading the solid evenly on a watch glass or aluminum weigh boat and placing it in an oven set at a temperature 20 °C below the substance's expected melting point. b. Placing it on top of a hotplate set on low. c. Leaving the solid on the funnel with the vacuum on for several minutes. d. Blowing on the solid.In recrystallization, fluted filter paper is used instead of a regular cone because it minimizes its contact with the glass funnel. Why is this important?
- Chemistry 5. You melt the substance and de-coloration occurs. Unfortunately, you weren’t paying attention and miss the melting point. Should you start over or re-melt it? Or both are options ‘okay’? 6. When measuring the melting point of a substance, it suddenly disappears. What has happened? Can you still measure the melting point? If so, how? 7. We should not re-use a sample in a capillary tube for melting point measurement. Why not? 8. It takes significant amount of time for the melting point apparatus to cool down before next measurement if your new sample has a lower melting point than your previous one. What can you do to reduce this time in between measurements when many samples of different melting points are used?Describe the process inside the test tube during boiling point determination (In other words, why not take the boiling point when the first bubble comes out but rather when the last bubble comes out?)Which tablet size and the liquid combination resulted in the fastest dissolution times?