Concentration-Time Graphs (AQA A-Level Chemistry): Quizzes

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Concentration-Time Graphs
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What shape does a concentration-time graph show for a zero-order reaction?

A straight line with negative gradient

How does a first-order reaction appear on a concentration-time graph?

A curve sloping down, steep then flattens

How does a second-order concentration-time curve compare to first-order?

Steeper initially and flattens more

How is the initial rate determined from a concentration-time graph?

Tangent to the curve at t=0t = 0

How do you find the instantaneous rate at a specific time?

Draw tangent at that point, find gradient

What indicates a first-order reaction on a concentration-time graph?

Constant half-life

If concentration falls from 0.80.8 to 0.40.4 mol dm−3^{-3} in 5050 s, what is kk for zero-order?

0.0080.008 mol dm−3^{-3} s−1^{-1}

What are the units of the rate constant kk for a first-order reaction?

s−1^{-1}

What are the units of kk for a zero-order reaction?

mol dm−3^{-3} s−1^{-1}

What does the gradient of a concentration-time graph represent?

Rate of reaction at that point

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