worksheet 1

Just what does it imply when people talk about a "homogeneous structure?"

on What is the volume of the atom with an atomic radius of 0.423nm and a BCC crystal structure? Please provide your answer in nm^3 with 3 decimal places. Only enter a numeric response. Answer:

1-what is the Definition of surfactant ?  2- The role of surfactant in nanomaterial ?

Using the knowledge established in the previous parts, answer the original question: Ultraviolet light with a wavelength longer than about 295 nm has little germicidal value. What is the frequency (in Hz) that corresponds to this wavelength? Hz

If you are using a very strong magnet you might get more interesting results by varying the distance of the magnet below the boat. Examine the starting FeCl and FeCI, solids used to prepare magnetite (leave the solids in their sealed containers.) How do they respond to a magnet? Which is magnetic?

The name carbohydrate comes from the fact that many simple sugars have chemical formulae that look like water has simply been added to carbon. (The suffix hydrate from the Greek word hydor ("water") means "compound formed by the addition of water.") The actual chemical structure of carbohydrates doesn't look anything like water molecules bonded to carbon atoms (see sketch at right). But it is nevertheless possible to chemically extract all the hydrogen and oxygen from many simple carbohydrates as water, leaving only carbon behind. If you search the Internet for "reaction of sulfuric acid and sugar" you will find some impressive videos of this. Suppose you had (200. g) of ordinary table sugar, which chemists call sucrose, and which has the chemical formula C12H₂2011. Calculate the maximum mass of water you could theoretically extract. Be sure your answer has alunit symbol, and round it to 3 significant digits. 0 HO CH₂OH OH OH OH The actual chemical structure of glucose.

The name carbohydrate comes from the fact that many simple sugars have chemical formulae that look like water has simply been added to carbon. (The suffix hydrate from the Greek word hydor ("water") means "compound formed by the addition of water.") The actual chemical structure of carbohydrates doesn't look anything like water molecules bonded to carbon atoms (see sketch at right). But it is nevertheless possible to chemically extract all the hydrogen and oxygen from many simple carbohydrates as water, leaving only carbon behind. If you search the Internet for "reaction of sulfuric acid and sugar" you will find some impressive videos of this. Suppose you had  300.g  of ordinary table sugar, which chemists call sucrose, and which has the chemical formula  C12H22O11 . Calculate the maximum mass of water you could theoretically extract. Be sure your answer has a unit symbol, and round it to the correct number of significant digits.

Vggg

1) Listen The Ksp value for calcium sulfate [CaSO4] is 2.40 X 10-5 and a professor made 1825 mL of a CaSO4(ag) solution but then one of his graduate student accidentally poured in a 0.125 M solution of calcium phosphate [Ca3(PO4)2] solution. You may ignore the additional volume coming from the Cag(PO4)2 solution to make the calculation simpler. Now that you have calculated the new equilibrium constant (K) with this common ion effect then which way will the chemical equilibrium shift? need more information to be determined at equilibrium chemical equilibrium will shift to the right first and then to the left chemical equilibrium will shift to the right chemical equilibrium will shift to the left 201591..docx LAB EXP. #3 -..docx Show All

Hsshsh

Scenario Four Read the following extract: "A polymer is a substance which has a molecular structure comprising of a large number of identical molecules covalently bonded together to form a long chain structure. Many synthetic organic materials are polymers, such as nylon, polythene and Kevlar." The extract mentions 'covalent bonds'. Explain what these are, and the formation of different types that can exist i.e. single, multiple etc. Do some research and identify 4 simply covalently bonded molecules. Draw dot and cross diagrams of each to show the bond formation of each of your 4 examples.

Bucks McGee, after being poisoned, is currently being treated in the hospital with an antidote- the chemical Fe(CN)18. The compound is so intensely coloured that even a small amount of it makes for a black or dark blue suspension. 2022-02-0. Given that this antidote has never before been administered at the hospital, none of the doctors or nurses have experience with it. There is one very old bottle of Fe>(CN)18 pills in the medicine store-room, but the label is worn and the units are in the old, archaic British Apothecaries' system which has unusual units like drachms, scruples, grains, and mites: 453.6 grams (g) = 1 pound (Ib) = 12 ounces (3) = 96 drachms (3) = 288 scruples (3) = 5760 grains (gr) = 115200 mites (m) ruu useu tnis antidote long ugu at dnother hospital, and who seemed to remember that they used to make 0.025 M solutions of this compound in ethanol and give 45 mL of the solution three times daily. What critical information is missing from the worn label? How many pills…

6) What is the density of NaCl given that and rci = 181pm. Show your calculations below. rNa+ = 102pm Hint: Edge length of an unit cell of NaCl, d = 2rci +2rNa+, Volume = d³ Mass of NaCl unit cell = (58.54g/formula unit) x (# of 'units of NaCl' in a unit cell) 6.022 x 1023 units/ formula unit Density = mass/volume