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- Answer the following questions in the spaces provided. 1. Identify four physical properties of gold that made it a great choice for currency. 2. Colloidal gold in solution changes colour depending on the size of the particles. Briefly explain how particle size relates to the colours we can see. 3. Copper and silver are better conductors of electricity than gold, but gold is more commonly used in electronics. Explain why. 4. Provide a brief summary of the history of gold mining in New Zealand4. Why do you determine a mass by difference? You use this because it's typically more accurate. 5. What are equivalence points and end points? How do they differ? equivalence point- the point @ which stoichiometric quantities are brought together, end point- the the equivalence point is theoretical, when end poi 6. Why should the standardized NaOH solution be kept in a stoppered bottle? pr 7. What is parallax? Why should you avoid it? Parallax is the upperent displacement or the di da in direction of an object as seen from two diffe points. са It should be colded because it ca errors in volume measurements. Copyright © 2018 Pearson Education, Inc.Sodium glutamate (commonly known as monosodium glutamate, MSG) is a salt found in seaweed that is used to enhance savory flavors, with a molar mass of 169.11 g/mol. Research has shown the ideal flavor profile for a soup is reached at 0.0856 M sodium glutamate. How many grams of MSG should be added to 2.44 L of soup to reach that concentration? g
- What is the molarity of a solution that results from dissolving 424.78 g of a compound with FW 20.76 into a total volume of 2.12 L? (Give your answer in units of M, with two places after the decimal point.)1-What are the dangers of hcl in the library ? 2- why add the acid hcl to diluted water not the opposite and add drop by drop2. We can check our predictions by using other materials for solubility experiments. a. Make a table for the Lewis structures, polarity and expected intermolecular forces for all of the following: water, I2, CH2CI2, CH;OH, and C:H24 b. Do you expeet la to be more soluble in CeH14 or H2O? Why? 9:16 PM Type here to search 35°F ^ # a E 11/1/2021 $4 4. 5. backspae 8 T F K D నామిలలు
- Consider these compounds: A. BaF2 B. PbCrO4 C. PbI2 D. ZnS Complete the following statements by entering the letter(s) corresponding to the correct compound(s). (If more than one compound fits the description, include all the relevant compounds by writing your answer as a string of characters without punctuation, e.g, ABC.) Without doing any calculations it is possible to determine that lead fluoride is more soluble than fill in the blank 1, and lead fluoride is less soluble than fill in the blank 2. It is not possible to determine whether lead fluoride is more or less soluble than fill in the blank 3 by simply comparing Ksp values.H-N-CES:OWLV2 | On x *: OWLV2 | Ass x * OWLV2 | On x y google- Yal x e Registration x D selfserve.un x n/takeAssignment/takeCovalentActivity.do?locator=assignment-take Use the References to access important values if needed for this question. The molar solubility of lead fluoride in a water solution is M. Submit Answer Retry Entire Group 8 more group attempts remaining W hp
- 1. A class organic compounds containing a six-membered ring with alternating double bonds that results in delocalization of the electrons within the ring. This class of compounds can have additional groups attached to the ring. 2. A family of organic compounds that can be represented by the general formula R-CHO. 3. A compound with the general formula R-COOH. It is a weak electrolyte that can lose an H+ ion in water solutions. 4. A hydrocarbon with a general formula of CnH(2n+2). All carbon-to-carbon bonds would be single bonds.150 140 130 120 110 100 90 80 70 60 50 -ха 40 FACI 30 20 KCIO 10 -Ce₂(SOs)s 0 0 10 20 30 40 50 60 70 80 90 100 Temperature (°C) • Rectangular Snip According the solubility curve graph above, the lowest temperature in which 50 g NH4Cl can be dissolved in 100 g water is- a 10°C b 50°C с 30°C Time left for this assessment: O d 60°C 67:47 Grams of solute per 100 g H₂O B NH NaNO3 KNO₂ KHÁCCocaine (C17H21O4N) is a natural substance found in the leaves of the coca plant, which has been used for centuries as a local anesthetic and stimulant. Illegal cocaine arrives in the USA either as a pure compound or as the hydrochloride salt (C17H21O4NHCl). At 25oC, the salt is very soluble in water (2.50 kg/L), but pure cocaine is much less so (1.70 g/L). What is the maximum amount of salt (in gram) that can dissolve in 50.0 mL of water? [1 mark.] When a 25 mL aqueous solution that contains 62.50 g of the salt is treated with NaOH, the salt is converted to pure cocaine. How much water (in liters) is needed additionally to dissolve the formed pure cocaine? Round your final answer off to two decimal points. C17H21O4NHCl(aq) + NaOH(aq) → C17H21O4N(aq) + H2O(l) + NaCl(aq)