ALL KNEWTON TESTS Exam Questions With Verified Answers.

ALL KNEWTON TESTS Exam Questions With Verified Answers. The rate of a reaction is: - answerdirectly proportional the to rate of collisions Identify the option below that exemplifies how the intrinsic chemical properties of a reactant affect the rate of reaction. - answerWhen exposed to air, sodium reacts completely overnight, whereas iron barely reacts. In a chemical equation, the symbol between the reactants and the products that is used to indicate an equilibrium reaction is _____________. - answertwo stacked arrows: one pointing to the left and one to the right. reactants⇌products What is the equilibrium expression for the reversible reaction shown below? 4NH3(g)+7O2(g)⇌4NO2(g)+6H2O(g) - answerKc=[NO2]4[H2O]6/[NH3]4[O2]7 Which of the following best describes the term homogeneous equilibrium? - answerHomogeneous equilibrium is the equilibrium in a system in which all reactants and products are present in a single phase What is the equilibrium constant for the reversible reaction in aqueous medium below given that the respective concentrations of A, B, C, and D are 0.0117 M, 0.00440 M, 0.00550 M, and 0.00780 M? 3A+3B⇌2C+3D Report your answer with three significant figures. - answer105 Consider the reaction shown below. Before the reaction occurs, the concentrations of A and B are each 0.0280 M. If the concentration of B at equilibrium is 0.0112 M, what is the equilibrium constant? A(g)+B(g)⇌2C(g) - answer9.00 The initial concentrations of PCl3 and Cl2 in the reaction below are each 0.0371 M. If the initial concentration of PCl5 is 0 M and the equilibrium constant is Kc=0.021, what will be the concentration of PCl3 when the system reaches equilibrium? PCl5(g)↽−−⇀PCl3(g)+Cl2(g) - answer0.019 M 2A+B↽−−⇀C If equilibrium concentrations are[B]=1.4 Mand[C]=0.85 M, andKc=2.5, what is the equilibrium concentration ofA? Your answer should have two significant figures. - answer0.49 Which of the following conditions are necessary for a change in total pressure to result in a change to the relative amounts of reactants and products for a gas phase reaction that is at equilibrium? - answerThe pressure change is a result of changing the volume of the container. The number of moles of gas on each side of the reaction are different. Which of the following helps us to predict the effect of change in temperature on a reaction system? - answerLe Châtelier's principle 2H2S can react to yield 2H2 and S2. Which of the following changes will shift the equilibrium to reactants? (select all that apply) - answerAdd more H2. Add more S2. Consider the reaction below. According to the Bronsted-Lowry definition, what acts as the conjugate acid when the reaction proceeds in the forward direction? CN−+H2O⇌OH−+HCN - answer???? DEF NOT H20 In a prospective buffer system, as the strength of the weak acid decreases (i.e., as the pKa increases), what happens to the strength of the conjugate base? - answer????