0.0784 moles of substance A is dissolved in water to make a 2.00 L solution. Then, substance B is added, without changing the volume of the solution, and the following reaction takes place: 2A (aq) + 3B (aq) →2C (aq) During the course of the reaction, concentration of A is monitored. After 100 seconds into the reaction, it was found that 0.0570 moles of A is remaining. Calculate the rate of disappearance of A in the first 100 seconds of the reaction. Hint: Since rate is defined as the change in molar concentration (mol/L) over time, start by calculating molarity of A in the beginning of the reaction, and 100 seconds after. rate = A [A] At O 3.92x104 M.s1 O 2.14x104 MS1 O 1.07x10 M.s1 O 5.34x10 Ms

The half-life of a chemical reaction is   the time it takes for half the present reactants to be used up   when a reaction has reached the half-way point   when only half of the reactant is used   the time passed when a reaction is half over

Consider the same reaction carried out two more times, both at the same condition(including concentration and temperature), but where the volume of the reaction is doubled in the second reaction. Since the concentrations are the same in both cases, the 2nd has twice the quantity of gases. How do those two rates of reaction compare to each other? Please compare using units of moles/(L•min) and separately using units of moles/min.

Methane and water react to form carbon monoxide and hydrogen, like this: CH₂(g) + H₂O(g) → CO(g) + 3H₂(g) 2 Imagine 169. mmol of CH4 and 169. mmol of H₂O are added to an empty flask, and then answer the following questions. What is the rate of the forward reaction before any CH4 or H₂O has been added to the flask? What is the rate of the forward reaction just after the CH4 and H₂O has been added to the flask? What is the rate of the forward reaction at equilibrium? How much CH4 is in the flask at equilibrium? Zero. Greater than zero, but less than the rate of the reverse reaction. Greater than zero, and equal to the rate of the reverse reaction. Greater than zero, and greater than the rate of the reverse reaction. Zero. Greater than zero, but less than the rate of the reverse reaction. Greater than zero, and equal to the rate of the reverse reaction. O Greater than zero, and greater than the rate of the reverse reaction. Zero. Greater than zero, but less than the rate of the reverse…

Consider the following general reaction for which gases A and B are mixed in a constant volume container: A(g) + B(g) -> C(g) + D(g) Match what happens to the rate of the reaction under the following changes: (consider each change separately) v all of gas B is removed from the container more gas A is added to the container the temperature of the container is increased there is no change to the reaction rate ya catalyst is added to the container I. the reaction proceeds at a faster rate v gas D is also added to the container the reaction proceeds at a slower rate II. some of gas B is removed from the container Iy the reaction does not proceed at all the volume of the container is increased

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A bimolecular reaction can involve a single reactant

Consider the reaction: H2 (g) +I2 (g) → 2 HI (g) A chemist performed an experiment and monitored the concentration of I2 during the course of the reaction. The red line in the graph below represents the results obtained. Which line in the plot would best represent how the concentration of HI changes during the course of the reaction? Time (s) Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a a b b d d е е Concentration (M)

2 Define "activation energy" a b What is the role of a catalyst in chemical reactions? Draw an energy profile diagram of an exothermic reaction and show the reaction pathway both with and without a catalyst present.