Rate Graphs Flashcards
All 5 cards in this deck
On a graph of quantity of product against time, when is the reaction fastest?
At the start, where the curve is steepest.
Why does the line of best fit on a product-against-time graph become horizontal?
The reaction has stopped (no more product formed) because a reactant has been used up.
Why does the curve on a product-against-time graph get less steep as the reaction goes on?
The concentration of the reactants decreases, so the collision frequency and rate decrease.
What are the steps to plot the results of a rate experiment as a graph?
e.g. volume of gas collected every 20 s- Put time on the x-axis and volume of gas on the y-axis.
- Plot each point accurately (to within ½ a small square).
- Draw a smooth curve of best fit, not dot-to-dot.
True or false? A line that levels off at a higher value always means a faster reaction.
False. The height it levels off at shows the total amount of product; the steepness of the line shows the rate.