Chemistry

A mixture of 90. 0 grams of CH4 and 10. 0 grams of argon has a pressure of 250 torr under conditions of constant temperature and volume. The partial pressure of CH4 in torr is?
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what is the percent by weight (w/w%) of sugar in soda? assume the average mass of sugar in soda is 31.0 g and the total mass is 370.0 g.
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determine the percent ionization of a solution having a ph of 4.35 and an initial weak acid concentration of 0.00019.
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8. A catalyst lowers the amount ofactivation energy needed to geta reaction started. What do youthink the diagram would looklike if a catalyst were added?
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sodium hydroxide is used to clear clogged drains. a solution of NaOH has a pH of 9.52 at 258C. what are its [H3O^+] and [OH^-]?
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describe the flow of energy that happens when bonds are broken and formed in a chemical reaction.
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An ester is mixed with LiNHCH3 in order to perform a SNAc mechanism. What is the LUMO in this reaction?A. N p orbitalB. C-N bondC. C-O * bondD. C-O * bond
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Select all reactants that could be used to prepare benzoic acid. Multiple select question. a. Na/NH2 b. Reactant B Reactant A O3, c. (CH3)2S KMnO4, d. OH
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compare the processes that occur when methanol (ch3oh), hydrogen chloride (hcl), and sodium hydroxide (naoh) dissolve in water. write equations and prepare sketches showing the form in which each of these compounds is present in its respective solution.
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When adding the measurements 42. 1014 g + 190. 5 g, the answer has Significant figures
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calculate the enthalpy change when 100. g of ice at 0.0 oc is heated to liquid water at 50.0oc. (the heat of fusion for water is 333 j/g.)
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the most common end product of the chemical weathering of feldspar is clay minerals. pyroxene. amphibole. calcite.
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Alexander, who weighs 180 lb , decides to climb Mt. Krumpett, which is 5620 m high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100-g bar contains 10 g of fat, 40 g of protein, and 50 g of carbohydrates. One gram of fat contains 9 Calories, whereas each gram of protein and carbohydrates contains 4 Calories.To determine how much food to bring, Alexander will need to take into account the energy required to climb the mountain. Gravitational potential energy is the energy stored in an object that is raised to a height. The gravitational potential energy is related to an object's mass m, the height h to which it is raised, and the acceleration due to gravity, g. The relationship is given by E=mghThe value of g near Earth's surface is 9.81m/s2.Alexander wants to know exactly how many bars to pack in his backpack for the journey. To provide a margin of safety, he assumes that he will need as much energy for the return trip as for the uphill climb. How many bars should Alexander pack?
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what is the major reason that physical properties do not differ much from one gaseous substance to another
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How many reaction schemes involving the alkene should you have in the "Reactions" section of your Pre-lab notebook?4132
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Besides having an emf, what is necessary for an electric current to perform useful work?
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!!(100 points)!! Identify the number of electrons each of the following atoms needs to gain or lose to have a stable outer electron configuration: Sodium(Na), Sulfur(S), Strontium(Sr)
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a steady current was passed through molten s n s o 4 until 5.51 g of metallic tin was produced. calculate the coulombs of electricity used.
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A large forest of trees was recently cut down. Which of the following effects, relating only to photosynthesis, is most likely to occur in this area as a result?a An decrease in carbon dioxide in the airb An increase in sunlightc A decrease in oxygen in the aird An increase in glucose (sugar) in the area
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15. why is it important to take both the polarity of the bonds and the shape of the molecule into consideration when determining the polarity of the molecule?
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what nacl nacl concentration results when 279 ml 279 ml of a 0.840 m 0.840 m nacl nacl solution is mixed with 442 ml 442 ml of a 0.220 m 0.220 m nacl nacl solution?
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How many grams of chlorine gas can be liberated from the decomposition of 169. 0 g. Of AuCl3
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Nuclear fission occurs when a neutron strikes the nucleus of a uranium-235 atom. The illustration models the chain reaction that can result. Which statement describes how a chain reaction results from the nuclear fission of uranium-235? A. It produces an enormous amount of energy in the form of heat. B. It takes enormous amounts of heat to get the reaction started. C. It produces neutrons that strike other nuclei and cause more fission. D. It uses a type of nuclear fuel that has a very short half-life.
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how many moles of oh- are in 55.85 ml of 0.350 m naoh? do not include units and place answers in 3 sig figs. be sure to include any zeros before the decimal and do not put answer in scientific notation.
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