
0973 06 Chemical Reactions - Rates SUPPLEMENT

Flashcard
•
Jonathan admin
•
Chemistry
•
10th Grade
•
Hard
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29 questions
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1.
FLASHCARD
Front
Define rate of reaction.
Back
The amount of reactant used up per second
2.
FLASHCARD
Front
What's the formula to calculate the mean rate of reaction in terms of reactants used?
Back
(quantity of reactant used) ÷ (time taken)
3.
FLASHCARD
Front
What's the formula to calculate the mean rate of reaction in terms of product formed?
Back
(quantity of product formed) ÷ (time taken)
4.
FLASHCARD
Front
What are the two possible units for rate of reaction?
Back
g/s or cm³/s (where s is seconds)
5.
FLASHCARD
Front
How can you tell the fastest rate of reaction from graphs of 'volume of product formed' against 'time'?
Back
The graph with the steepest gradient is the fastest.
6.
FLASHCARD
Front
How can you tell a reaction has completed from a graph of 'volume of product formed' against 'time'?
Back
When the gradient becomes zero (a straight horizontal line).
7.
FLASHCARD
Front
What is a tangent?
Back
A straight line that touches a curve at a point but doesn't cross the curve
8.
FLASHCARD
Front
How can the rate of a reaction be shown at a point in time on a graph?
Back
by drawing a tangent
9.
FLASHCARD
Front
How can the rate of a reaction at a point in time be calculated from a graph?
Back
1. Draw a tangent on the graph at the point in time 2. Rate of reaction = gradient of the tangent = change in y ÷ change in x
10.
FLASHCARD
Front
Why does the rate of a reaction decrease over time?
Back
because the number of reactant particles available to react decreases as they are turned into products
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