Chemistry

Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HCl(aq), asdescribed by the chemical equationMnO,(s) + 4 HCl(aq)MnCl(aq) + 2 H2O(l) + Cl (8)How much MnO(s) should be added to excess HCl(aq) to obtain 175 mL C12(g) at 25 C and 715 Torr?mass of MnO2
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Divers often inflate heavy duty balloons attached to salvage items on the sea floor. If a balloon is filled to a volume of 1.20 L at a pressure of 6.25 atm, what is the volume of the balloon when it reaches the surface?
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Given that the Ksp value for Ca3(PO4)2 is 8.61019, if the concentration of Ca2+ in solution is 4.9105 M, the concentration of PO34 must exceed _____ to generate a precipitate.
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To find the pH of a solution of NaNO2, one would have to construct an ICE chart using: a. the Kb of NO2 to find the hydroxide concentration.b. the Kb of HNO2 to find the hydronium concentration.c. the Kb of NO-2, to find the hydronium concentration.d. the Kb of HNO2, to find the hydroxide concentration.
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an atom Y has atomic number 13. It loses three electrons in order to be stable.i.) What is the proton number and electron number of the atoma)before it loses electronsb) after losing electronsii.) name the tyoe of ion formed by the atom when it loses three electrons Show by illustration
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A solution contains 2.2 10-3 M in Cu2+ and 0.33 M in LiCN. If the Kf for Cu(CN)42- is 1.0 1025, how much copper ion remains at equilibrium?
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If a sample of C-14 initially contains 1.6 mmol of C-14, how many millimoles will be left after 2250 years
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For the reaction CO2(g) + H2(g)CO(g) + H20(g) H=41.2 kJ and S=42.1 J/K The standard free energy change for the reaction of 1.96 moles of Co2(g) at 289 K, 1 atm would be_________KJ. This reaction is (reactant, product)___________ favored under standard conditions at 289 K.Assume that H and S are independent of temperature.
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The melting points of ionic compounds _____
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Suppose 300 mL of 0.50 M lithium bromide solution and 300 mL of 0.70 M rubidium bromide solution are combined. What is the concentration of the bromide ion in the resulting solution?
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Iron and aluminum are examples of
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Which ONE of these cations has the same number of unpaired electrons as Fe2+ ? A) Ni2+ B) Fe3+ C) Cr2+ D) Mn2+ E) Co2+
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Which of the following is NOT the property of a non-metal? A. Non-rigid structure B. Not ductile C. Low density D. Malleable
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One hundred fifty joules of heat are removed from a heat reservoir at a temperature of 150 K. What is the entropy change of the reservoir (in J/K)?
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The solubility product for Ag3PO4 is 2.8 1018. What is the solubility of silver phosphate in a solution which also contains 0.10 moles of silver nitrate per liter?
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Read the article. Use your understanding to answer the questions that follow. What type of source is this article? primary or secondary and how do you know
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how scientific inferences can be made from scientific observations
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What are cells and how are they important to maintaining life?
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How many moles of oxygen are in 49.2 grams of carbon dioxide?
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03/08/2020Question 1.(a) State the definition of a chemical formula.(b) What does it tell about a compound?(c) What information is conveyed by the formulation H2SO4?
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You are the captain of a ship, and you just hit an iceberg. Water is rushing into the ship and it is quickly sinking. A total of 10 people are on the ship and all of them are in grave danger! Hungry sharks are everwhere! The good news is that you have a lifeboat onboard. The bad news is that it only has room for 5 people. You don't know any of the people very well (only the information provided), and you don't have time to interview them before hopping onto the lifeboat. So, you do you keep, and why (and you do NOT have to keep yourself)?
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In the laboratory, a volume of 100 mL of sulfuric acid (H2SO4) is recorded. How many g are there of the liquid if its density is 1.83 g / cm3?
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The front curve of a spectacle lens is called?
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PLZ HELP! TIMED TEST Which of the following groups of elements are likely to have elements in the three states of matter? (1 point) Alkali metals Actinides Halogens Lanthanides
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