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- 4. Two engineers are serving as trainees in a laboratory of a pharmaceutical company. One of their tasks involves determining the identity of a vitamin they were given by using any equipment or method at their disposal. As a hint, their supervisor gave them a list of possible candidates for the vitamins identity which includes: Vitamin Molecular Formula Folinic Acid C20 H23 N707 C3H11NO3 C,H,N20 C17H20N406 Pyridoxine Niacinamide Riboflavin To identify the vitamins identity, the two trainees separated their sample into two equal portions and performed two separate tests: [a.] Engr. Mayo used the flame atomic absorption spectrophotometer in order to identify the elemental composition of the sample which happens to be 59.0% C, 5.0% H and 22.9% N by mass [b.] Engr. Busog on the other hand mixed his 3.88 g sample with 30.0 mL of nitrobenzene, C,H5NO2 (Latent Heat of Fusion = 79.81 J/g). Using Beckmann's method, he determined the freezing point depression to be 7.1 deg C. Based on the tests…4:00 -5:20 pm CHEM2101 QUIZ WEEK 4 8 OCTOBER, 2020 WRITE ONLY YOUR ANSWERS IN BLUE OR BLACK INK DO NOT COPY THE QUESTIONS NUMBER YOUR ANSWERS CORRECTLY TO AGREE WITH THE NUMBERING OF THE QUESTIONS QUESTION 1: What are the physical properties of each of the following substances? arwa (a) copper(II) nitrate (b) sulfur (c) honey (d) drinking water QUESTION 2: What does the following picture show? SQUESTION 1 questions. Just give the answer only. Make sure that your answers are carefully numbered. Give short answers to each of the following questions. Do not copy the (a) A homogeneous mixture which contains water as a solvent is called (b) Ni(CIO4)2-6H2O is hydrated whereas Ni(CIO4)2 is (c) Nacl contains an bond whereas O2(g) contains a bond (d) A homogeneous mixture has a and composition (e) Temperature is an, because it does not depend on the amount of substance (f) The maximum number of electrons that an orbital can have is (g) The energy of the lowest level in the H atom is (h) Arrange the following subshells in the H atom in order of increasing energy: 3s 4d 2p 41 3d 2s 3p (i) Wavelength and frequency of, radiation have an relationship (i) In an atom, what is the maximum number of electrons that can have the following set of quantum numbers? n = 4, m =-1, m, = +% (k) Draw a 3d2 orbital and describe it in your own words. (1) Write the ground state electron configuration for…
- 1. The following substances will be used or observed in this experiment. Provide the chemical formula for each substance and state whether it is an element or a compound. If it is an element, state whether it is a metal or a non-metal element in column 4 and leave column 5 blank. If it is a compound, leave column 4 blank and state whether it is an ionic or covalent compound in column 5. (1) Substance (2) Formula (3) Element or Compound? (4) Metal or Nonmetal? (only for elements) (5) lonic or Covalent? (only for compounds) Covalent Ionic Honic Ionic Honic compound compound C02 COC12 Coa (PO4)2kompound CUCOS CuCl2 carbon dioxide cobalt(II) chloride cobalt(II) phosphate compound compound copper(II) carbonate copper(II) chloride hydrogen magnesium magnesium chloride magnesium oxide methane охудen sodium acetate sodium carbonate sodium chloride sodium phosphate sodium sulfate water zinc zinc chloridepour it 2. Still sleepy from a late night studying, you take the milk out of the refrigerator and pour it on your lemon juice to milk to make paneer (fresh cheese). As a group, craft a chemical explanation for the fact of coagulated milk onto your cereal. The last time you saw milk coagulate like that was when you added breakfast cereal. Unfortunately, by the time you notice the funny smell you have already poured clumps lemon juice to milk to make paneer (fresh cheese). As a group, craft a chemical explanation foea added that spoiled milk coagulates.QUESTION 1 questions. Just give the answer only. Make sure that your answers are carefully numbered. Give short answers to each of the following questions. Do not copy the (a) A homogeneous mixture which contains water as a solvent is called (b) Ni(CIO4)2·6H2O is hydrated whereas Ni(CIO4)2 is (c) NaCl contains an bond whereas O2(g) contains a bond (d) A homogeneous mixture has a and composition (e) Temperature is an because it does not depend on the amount of substance (f) The maximum number of electrons that an orbital can have is (g) The energy of the lowest level in the H atom is (h) Arrange the following subshells in the H atom in order of increasing energy: 3s 4d 2р 4f 3d 2s 3p (i) Wavelength and frequency of radiation have an relationship (i) In an atom, what is the maximum number of electrons that can have the following set of quantum numbers? n = 4 , m = -1 , ms = +½ (k) Draw a 3dx2- orbital and describe it in your own words. (1) Write the ground state electron configuration…
- 1. When a candle is lit and allowed to burn for 15 minutes, some wax drips and collects at the base of the candle, and the candle becomes shorter. a) Did you observe any physical changes? Explain. b) Why did the candle become shorter? What happened to the missing sections of the candle? c) Did you observe any evidence of chemical change? Explain2. Explain the difference between (a) nanoscience and nanotechnology (b) nanomaterial and nanoparticleYou are given a hammer a battery, a bulb, wires and switch(a) How could you use them to distinguish between samples of metals and non metals?(b) Assess the usefulness of these tests to distinguish between metals and non-metals
- 1. A mixture (shown below) contains the following components: (1) salt, (2) water, and (3) gasoline. Discuss the separation techniques needed to separate the mixture back into its individual components. gasoline saltwaterThe mass of a neonate is 1.6070 kg. State the number of significant figures in this measurement. 1) 4 2) 3 3) 5 4) 2 5) 1Example 60 mice, each weighing 2 kg, were used in a lethal dose (LD50) experiment. The number of death mice versus the mass of substance A given to each mouse presented in the Figure below. 70 60 E S0 40 30 ultann A E 20 10 10 15 20 29 30 35 40 Mass of Sulstance given to each mouse (mg) Calculate the lethal dose (LD50) of substance A and B seperately. • Which one of the substances is more toxic? Number of death mice