What is the empirical formula of the compound? a sealed flask contains 1 molecule of hydrogen for every 3 molecules of helium at 20 °C. Molecular shape determines a compound’s state of matter, boiling point, freezing point, viscosity, volatility, surface tension, and the nature of its reactions. BRILLIANT PUBLIC SCHOOL, SITAMARHI (Affiliated up to +2 level to C.B.S.E., New Delhi) Class-XI IIT-JEE Advanced Chemistry Study Package Session: 2014-15 Office: Rajopatti, Dumra Road, Sitamarhi (Bihar), Pin-843301 Ph.06226-252314 , Mobile:9431636758, 9931610902 Website: www.brilliantpublicschool.com; E-mail: [email protected][email protected] if the total pressure is 400 kPa, the partial pressure of the hydrogen is... the volume of a sample of air in a cylinder with a movable piston is 2.0 L at a pressure P1, as shown in the diagram above. a student obtains a mixture of the liquids hexane and octane, which are miscible in all proportions. The percent by mass of X and the percent by mass of Z in the mixture is known. based on coulomb's law and the information in the table above, which of the following anions is most likely to have the strongest interactions with nearby water molecules in an aqueous solution? The NaOH(aq) was added from a buret to the HC2H3O2(aq) in a flask. When C2H4(g) reacts with H2(g), the compound C2H6(g) is produced, as represented by the equation above. When dissolved in water, they don't conduct electricity. Ternary acids commonly contain hydrogen, a nonmetal, and oxygen. For one of the demonstrations, a student concluded that a physical change took place, but not a chemical change. Gain Electrons Reduction, H2Se(g) + 4 O2F2(g) → SeF6(g) + 2 HF(g) + 4 O2(g). D: testing the electrical conductivity of an aqueous solution of the substance. K2SO3(aq)+2HNO3(aq)→2KNO3(aq)+SO2(g)+H2O(l), Using 200.0mL of 0.100MK2SO3(aq) and 200.0mL of 0.200MHNO3(aq), because these are the required stoichiometric amounts, It is an oxidation-reduction reaction because zinc is oxidized and hydrogen is reduced, 5Fe2+(aq)+MnO4−(aq)+8H+(aq)→5Fe3+(aq)+Mn2+(aq)+4H2O(l). the diagram above [shows the positive end of water facing a molecule] represents a particle in aqueous solution. One piece of solid substance was changed into small pieces. Six electrons are given up by 2 Al atoms in the oxidation half-reaction, and six electrons are added to 3 Zn2+ ions in the reduction half-reaction. The Taxol nucleus has the molecular formula C32H40O11. Place 5 mL of tap water into a small, clean beaker. a. Studyres contains millions of educational documents, questions and answers, notes about the course, tutoring questions, cards and course recommendations that will help you learn and learn. The peaks with the lowest binding energy correspond to the valence electrons, while the peaks at the highest binding energy correspond to the inner-shell or core electrons. Find the training resources you need for all your activities. the ratio of the numbers of Ar, Ne, and He atoms in the vessels is 2:1:6, respectively. which of the following is the most likely empirical formula of a compound formed from element X and phosphorus, P? under which of the following conditions of temperature and pressure will H2 gas be expected to behave most like an ideal gas? Which of the following claims about a binary compound in which the bonding is ionic is most likely to be scientifically valid? B: boron nitride is a network solid of atoms connected by covalent bonds with fixed bond angles. [0.1m hc2h3o2, 0.1m ki, 0.1m ch3oh] of the three solutions listed in the table above, which one, if any, has the greatest electrical conductivity and why? not change, because the amount of AgNO3(aq)AgNO3(aq) did not change. D: the atomic radius of Cl is smaller than that of S because Cl has a larger nuclear charge than S does, if a pure sample of an oxide contains 40% sulfur and 60% oxygen by mass, then the empirical formula of the oxide is. on the basis of periodic properties which of the following compounds can most likely be used as a fire-resistant chemical. A beaker was half filled with freshly distilled H2O and placed on a hot plate. If no reaction occurs, write 'N.R.' Molecular. Oxidation-reduction, because H2(g) is oxidized. With four electron domains around the central N atom, their geometry is tetrahedral (which minimizes repulsion among the four electron pairs). The pressure inside the container is recorded using a pressure gauge. As the temperature of the water reached 100°C, vigorous bubbling was observed in the beaker. the complete photoelectron spectra of neutral atoms of two unknown elements, X and Y, are shown above. Precipitation reactions can help determine the presence of various ions in solution, Lose Electrons Oxidation. the mass of the anhydrous Na2SO4 (molar mass 142 g) that remains is 1.42 g. the value of x in the hydrate is. the photoelectron spectra above show the energy required to remove the 1s electron from a nitrogen atom and from an oxygen atom. Place about 0.2 g of solid sodium chloride (\(\ce{NaCl}\)) into a small, clean beaker and test the conductivity. which of the following best describes the change that takes place immediately after the CH3OH (l) is introduced into the previously evacuated vessel? which of the following particle diagrams best represents the products when four molecules of H2O2 decompose into water and oxygen gas at room temperature? which of the following statements is true about the absorption bands in the spectrum? It looks like your browser needs an update. C: all of the acids will need the same volume of NaOH to reach equivalence point, [diagram with 4 CO molecules and 3 O2 molecules]. 100% yield). which of the following would be most useful in providing data to determine if the substance is an ionic compound? There is ionic bonding between Mg2+ ions and NO3− ions. Which of the following information is needed to determine the mole fraction of each gas in the mixture? based on the table above [shows the structural formula and molar mass of butanol, pentane, and propanoic acid], which of the compounds has the highest boiling point, and why? The presence of which of the following substances would support the claim that the observed phenomenon was a physical change? the structure of one form of boron nitride is represented above. the photoelectron spectra for H and He are represented above. Which of the following statements correctly predicts the change in pressure as the reaction goes to completion at constant temperature, and provides the correct explanation? The name of the most common form of the acid consists of the nonmetal root name with the -ic ending. The carbon-to-carbon bond on the left is stronger because it is a double bond. which diagram provides the better particle representation for the solubility of O2 and H2O, and why? C: element Y has a greater nuclear charge. The mass of each gas used to make the mixture is known. To ensure the best experience, please update your browser. The insoluble salt that falls out of solution is known as the precipitate, hence the reaction's name. Based on the Lewis diagram for NH3, shown above, the H-N-H bond angle is closest to which of the following? when 4.0 L of He(g), 6.0 L of N2(g), and 10. the data recorded by one student are shown in the table above. If a 115 mg sample of Taxol were subjected to combustion, calculate both the amount of carbon dioxide and water (in mg) expected. which of the following techniques would be best for separating the components of the mixture and why? After the solution was filtered, the yellow solid was dried and weighed. Which of the following additional information is most helpful in calculating the mole percent of XCl(s) and of ZCl(s) in the mixture? At 24 °C, the vapor pressure of water is 22 millimeters of mercury. a 20 mL sample of 0.5 M HC2H3O2 is titrated with 0.5 M NaOH. The smallest whole-number coefficient for Al is 2. if the reaction produced 0.095 atm of gas, the concentration of the HCl solution was at least. what will be the pressure in the vessel at 400K? The volume taken up by the solids is negligible, and the initial pressure of N2(g) in each vessel is 720 mm Hg. C: the student labeled the cuvettes incorrectly, reversing the labels on two of the solutions of known concentration. Rb reacts with O in a mole ratio of 2 to 1, forming the ionic compound Rb2O. if the solutioh represented in vessel 1 is KCl then the solution represented in vessel 2 could be an aqueous solution of, D: CaCl2 with twice the molarity as the solution in vessel 2. beta-carotene is an organic compound with an orange color.
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