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college chemistry answers

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The contact angle between the liquid and the tube is ze... SDS-PAGE is commonly used to separate proteins in a mixture. What is the difference between molarity and molality? b. A solution made from ethanol and water is 1.75 molar (m) in ethanol. How is chemistry connected to everyday life? Calculate the value of (H3O+) of a solution with (OH-) = 4.21 x 10-9 M. Is the solution acidic or basic? Given that the ene... Geometrically tetrahedral means that the electron groups have what angle? How can an understanding of basic chemistry help scientists cure diseases in the future? When heating, why should you heat the evaporating dish gently and intermittently? Complete the explanation. Crystalline and amorphous solids differ in the degree of order among their particles. Explain what chemophobia is, the "symptoms", and how you would help people who are afflicted better understand the importance of chemistry. I found the balanced equation : 4C + S8 = 4CS2, but I am confused about how to find the grams.Any help is greatly appreciated!Consider the following unbalanced reaction: C(s) + S8(s) → CS2(l) How... © 2005 - 2020 Wyzant, Inc. - All Rights Reserved, a Question Calculate the heat when 10.0 grams of aluminum reacts with excess oxygen at constant pressure to form aluminum oxide. Draw Lewis structures for the following compounds/ions. How might this process be used to explain the degradation in aquatic ecosystems due to thermal pollution? SO42-(aq) + HCN(aq) arrow HSO4-(aq) + CN-(aq). Before entering the furnace, the air is preheated from 32 o F to 575 o F. At what rate (Btu/h) must heat be transferred to the air if the feed rate of p... Why are intermolecular forces generally much weaker than bonding forces? How many grams of CaCl2 should be dissolved in 500.0 ml of water to make a 0.20 M solution of CaCl2? How it works with aniline as example? (Vapor pressure of H2O = 23.8 mmHg). The difference in the chemical shift between two protons observed in a 15 MHz field is 230 Hz. Calculate the density of methane (CH4) at STP. For a particular dive, 35.7 L of oxygen gas at 25.0oC and 1.08 atm, and 6.33 L of helium gas at 25.0oC and... Ammonia is produced from the reaction of nitrogen and hydrogen according to the following balanced equation:N2(g) + 3H2(g) → 2NH3(g)1. c. It is attracted to the negatively charged plate in an... At 25 degrees C, how many dissociated H ions are there in 305 mL of an aqueous solution whose pH is 11.91? Predict the electron pair geometry and the molecular structure of the following molecule or ion: CH_3 ^+, Predict the electron pair geometry and the molecular structure of the following molecule or ion: BeH_2, Predict the electron pair geometry and the molecular structure of the following molecule or ion: PCI_5, Predict the electron pair geometry and the molecular structure of the following molecule or ion: SF_6. What is the pH of 0.35 M solution of sodium formate (NaHCOO)? The enthalpy of combustion of gasoline is about 45 kJ/g. Which of the following characterizes a beta ray? The specific heat of liquid water is 4.184 J/g degrees Celsius. Why does the atomic radius increase from top to bottom? Its volume is 0.225 L at a temperature of 55 degrees Celsius and a pressure of 886 mmHg. The compression factor of a fluid is defined as the ratio PV/NkT; the deviation of this quantity from 1 is a measure of how much the fluid differs from an ideal gas. Explain why staggered conformer is more stable than an eclipsed conformer? How many moles of iron(III) oxide are required to completely react with 1.40 x 10^22 atoms of carbon in the following reaction? a) C_2H_3O_2 ^- b) H_3O^+ c) HC_2H_3O_2 d) H_2. In the reaction: NiCl_2(aq) + 2NaOH(aq) \to Ni(OH)_2(s) + 2NaCl(aq) How many grams of Ni(OH)_2 are produced from the reaction of 30.5 mL of 1.75 M NaOH and excess NiCl_2? Besides vodka, there are other colorless alcohol-containing beverages that can be titrated following the procedure in your lab. When was Anna J. Harrison awarded the Frank Forrest Award? How has society benefited from advances in the chemical industry? 120 degree B. If the percent yield is 66.3 %, What mass of PCl_5 is actually formed when 61.3 g of Cl_2 reacts with excess PCl_3? 2KClO3 arrow 2KCl + 3O2 c. CaCO3 arrow CaO + CO2 d. SO2 + H2O arrow H2SO3. Each sample is diluted in Standard Dissociating buffer and heated for 5 mins before placing on ice and loading onto the gel. Which is the limiting reagent? Why do you think it is important to have a basic understanding of chemistry in your study of Anatomy and Physiology and in turn, your study of Exercise Science? NaOH (aq) + HCl (aq) \to NaCl (aq) + H2O (l) a) H^+ (aq) + OH^- (aq) \to H2O (l) b) Na^+ (aq) + Cl^- (aq) \to NaCl (aq)... 30.00 mL of 0.100 M H_2SO_4 solution was used to neutralize 20.55 mL of NaOH solution. Given the average values for the percent alcohol by volume listed in... What's the chemical reaction of: Ag^+ + 6M Hcl Ag^+ + Hot stream Ag^+ + 1M K2CrO4. What is the average atomic mass of oxygen? Exam1-2018-Answer-Key. Calculate the root mean square velocity of nitrogen molecules at 25 deg C. Calculate the energy for the transition of an electron from the n = 8 level to the n = 2 level of a hydrogen atom. What are the periodic trends on the table? 1. I think number three is Titanium and four is Chlorine, but cannot figure out the electrons or neutrons. Calculate the molar solubility of CaF2 (K_sp = 4.0 times 10^(-11)) in a 0.025 M NaF solution. Using a single reagent, how could you distinguish between the following pairs of substances contained in separate test tubes? Initially, 2 kg of the water is in the liquid phase and the rest is in the vapor phase... A 2 mm diameter tube is inserted into a liquid in an open tank and the liquid is observed to rise 10 mm above the free surface of the liquid. Fe2O3 + 3C arrow 2Fe + 3CO. A buffer is made by adding 0.24 mole acetic acid and 0.16 mole sodium acetate in 1L water. Browse through all study tools. If I have 0.21 grams of KHP, how many moles is that? What volume of hydrogen at STP is needed to react with 3 moles of oxygen? How will we know when we reach the endpoint of the titration? In what direction will the equilibrium shift? Use the simplification: 1mL of the solution = 1g. A. What is the fluid force?

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