You study the rate of a reaction, measuring both the concentration of the reactant and the concentration of the product as a function of time, and obtain the following results:
(a) Which chemical equation is consistent with these data:
(i) A 
B, (ii) B A, (iii) A 2 B,
(iv) B 2 A?
(b) Write equivalent expressions for the rate of the reaction in terms of the appearance or disappearance of the two substances.
You study the rate of a reaction, measuring both the concentration of the reactant and the concentration of the product as a function of time, and obtain the following results:
(a) Which chemical equation is consistent with these data:
(i) A B, (ii) B A, (iii) A 2 B,
(iv) B 2 A?
(b) Write equivalent expressions for the rate of the reaction in terms of the appearance or disappearance of the two substances.
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Related questions
The rate of reaction indicates the speed at which the reaction can occur. It can be expressed in terms of a change in the concentration of reactants or products per unit of time:
rate = concentration changetime change
The rate of reaction can be defined either as a decrease in the concentration of a reactant per unit of time or as an increase in the concentration of a product per unit of time.
Select the image to explore the activity that shows the different ways in which the rate of a reaction can be expressed.
When you click on the "Disappearance of reactants," "Appearance of products," or "Rate law expression" button, you will observe different expressions for the rate of the reaction.
Consider the following reaction:
2A+3Bâ3C+2D
Use the following data to determine the rate of reaction in terms of the disappearance of reactant A at time = 20 s.
| Time (s) | 0 | 20 | 40 |
| [A](M) | 0.1200 | 0.0720 | 0.0540 |
Express your answer in molar concentration per second to three significant figures.
Part B
Consider the following reaction:
2A+3Bâ3C+2D
Use the following data to determine the rate of reaction in terms of the appearance of product C when the time is 20 s.
| Time (s) | 0 | 20 | 40 |
| [C](M) | 0.000 | 0.0720 | 0.1440 |
