chemistry lab

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noqhy764

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i need to solve all problems according the data and pre-lab(2) questions and pre-lab(3) questions, but please i don't want very long answers. thanks

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4. Suppose you weighed 2.003 g sample of a mixture of NH CI, NaCl, and SiO2. Accidentally you dropped a small amount of the sample on the floor. Nevertheless, you decided to carry out the experiment without further weighing the mixture. How would the individual mass percentages of NH CI, NaCl, and SiO2 be affected? 5. In this experiment you separated NH CI, NaCl, and SiO, from the mixture of NH CI, NaCl, and SiO2 using sublimation and decantation. Name some other methods chemists use in the laboratory to separate components from their mixture. morta Heather tongoa guld 10 do leito T e out this to logo Di Duo desde o niedale is al madi obro 62 Separation of a Solid Mixture Experiment #2 Problems: 1. Look in the Handbook of Chemistry and Physics to find differences in the physical properties of MgSO, CaSO4, and CH, (naphthalene) and develop a procedure for separating a mixture containing all three of these compounds. A copy of the Handbook of Chemistry and Physics may be obtained from the library, the chemistry lab, or your instructor. Da er beradio 2. The chemical formula of blue copper sulfate is CuSO, 5H20. Determine the mass percent of water in blue copper sulfate. 3. You may be able to separate NH CI, NaCl, and SiO, from their mixture in a different order than what you actually did in the laboratory. Explain. Experiment 2 61 Date: Experiment #2 Pre-Lab Questions 1. Classify each of the following as a pure substance or a mixture: ammonium chloride Santo (b) silica sto slate TOL S 2 otab W 130130 borba out at to (c) gasoline (d) dry ice iodine crystals 2. Define the terms "pure substance” and “mixture". 3. In this experiment what particular method did you use to separate ammonium chloride from the mixture? What safety precaution do you need to know when you use this method of separation? to Experiment 2 57 4. What other safety precautions do you need to be aware of before you start the experiment? ar data Kim so aasade once with a todos atent 5. rolour ETOS Consider that you started with 2.101 g sample of a mixture containing NH_CI, NaCl, and SiO, and sublimed away 0.810 g of NH CI. When you removed all of NaCl by dissolving in water, 1.008 g of silica was present in the evaporating dish. What was the mass percentage of NaCl in the mixture? Show all work. lease sob 16 ellano gribor Substeduzetique dois sono le cose ar boy bib boriti se asub word toes or obuvid Patim emrit Cooling to bedien 58 Separation of a Solid Mixture Date: Experiment #3 Pre-Lab Questions 1. All chromatography involves a stationary phase and a mobile (moving) phase. What is the stationary phase in this experiment? What is the mobile phase in this experiment? 2. What is the definition of an Rp value? If a compound has traveled 2.3 cm while the solvent has traveled 7.7 cm, what is the Rę value for the compound? 3. List two factors used to identify a substance in our paper chromatography experiment. Experiment 3 71
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Experiment #2 Pre-Lab Questions
Answer:
1. Classify each of the following as a pure substance or a mixture:
(a) Ammonium chloride: pure substance.
(b) Silicon dioxide: pure substance.
(c) Gasoline: mixture.
(d) Iodine crystals: pure substance
2. Define the terms "pure substance” and “mixture".
Answer:
Pure substances are defined as substances that are made of only one type of atom or only one
type of molecule. A mixture is a combination of two or more pure substances in which each pure
substance retains its individual chemical properties
3. In this experiment what particular method did you use to separate ammonium chloride from
the mixture? What safety precaution do you need to know when you use this method of
separation?
Answer:
The ammonium chloride can be separated from the mixture by the process called sublimation.
On a tripod stand a china plate having mixture is placed and it is heated. The safety precaution is
that, Cotton should be used at the terminal end of funnel.
4. What other safety precautions do you need to be aware of before you start the experiment?
Answer:


Safety goggles must be worn at all times w...


Anonymous
This is great! Exactly what I wanted.

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