![]() ![]() c) SiH4 (g) -> Si(s) + 2 H2 (g) d) The H2(g) molecules are more highly dispersed than the Si(s) atoms and, therefore, have a higher absolute molar entropy. London dispersion forces are much weaker than covalent bonds, so SiH4 boils at a much lower temperature than SiO2. SiO2 is a network covalent compound with covalent bonds between silicon and oxygen atoms. (Assume that the amount of CO2(g) dissolved in the solution is negligible.) (g) After the reaction has proceeded for several minutes, does the amount of catalyst increase, decrease, or remain the same? Justify your answerĪ) i) 14 protons and 14 neutrons ii) 1s2 2s2 2p6 3s2 3p2 OR 3s2 3p b) SiH4 is composed of molecules, for which the only intermolecular forces are London dispersion forces. Calculate the number of moles of CO2( )g produced in the reaction. The vessel originally did not contain any gas. HCOOH(aq )→ H2(g ) + CO2 (e) Is the reaction a redox reaction? Justify your answer (f) The reaction occurs inarigid 4.3 L vessel at 25☌, and the total pressure is monitored, as shown in the graph above. When a catalyst is added to a solution of HCOOH(aq), the reaction represented by the following equation occurs. ![]() (ii) Is the resulting solution acidic, basic, or neutral? Justify your answer. (i) Write the balanced net ionic equation for the reaction that occurs when H2NNH2 is combined with HCOOH. A 50.0 mL sample of M H2NNH2 0.25 aq)( is combined with a 50.0 mL sample of 0.25 M HCOOH( ) aq. H2NNH2 (aq ) + H2O(l) H2NNH3 (aq ) + OH (aq) Kb= 1.3 x 10^-6 d) In aqueous solution, the compound H2NNH2 reacts according to the equation above. Show all bonding and nonbonding valence electrons. (c) In the box below, complete the Lewis electron-dot diagram for HCOOH. (b) Calculate the pH of a 0.25 M solution of HCOOH. 2021 FRQ #1 HCOOH(aq) + H2O(l) H3O (aq ) + HCOO (aq) Ka= 1.8 x 10^-4 (a) Write the expression for the equilibrium constant, Ka, for the reaction. ![]()
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