AQA · Chemistry · 8462
GCSE Chemistry (AQA): Rates of Reaction
Topic 5 — Energy Changes. Generated from the caption track of Cognito's lesson video "GCSE Chemistry - Rates of Reaction - How to Measure it | How to Show it on Graphs (2027/28 exams)"; each card deep-links to the moment in the video it came from. Lesson 6.01 of Cognito's AQA GCSE Combined Science (Trilogy) and Chemistry course (Higher tier), filed under AQA Chemistry 8462. Teaching by Cognito — https://cognitoedu.org/coursesubtopic/c2-gcse-aqa-h-c_6.01.
12 flashcards · Free to study · No account needed
Study this deck
Preparing your cards…
All questions and answers
Read through the full deck, or practise recalling each answer above.
Which two quantities can be measured to find the rate of a reaction?
Show answer
How fast the reactants are used up, or how fast the products are formed.
State the equation for rate of reaction using products.
Show answer
Rate = quantity of product formed ÷ time taken.
What is meant by the rate of a chemical reaction?
Show answer
The speed at which reactants are turned into products.
0.6 moles of magnesium are used in 2 minutes. What is the rate in mol/min?
Show answer
0.3 mol/min — 0.6 ÷ 2.
Why does the rate of a reaction decrease as the reaction progresses?
Show answer
The reactants get used up, so there are fewer reactant particles able to react together.
A rate calculated from the total quantity and total time is the ? rate of reaction.
Show answer
mean
3 g of magnesium is completely used up in 4 minutes. What is the rate?
Show answer
0.0125 g/s — 3 g ÷ 240 s.
Why does a graph of volume of product against time plateau?
Show answer
The reaction has finished because a reactant has been completely used up, so no more product forms.
A reaction produces 180 cm³ of hydrogen in 2 minutes. What is the rate?
Show answer
1.5 cm³/s — 180 cm³ ÷ 120 s (the 2 minutes must be converted to seconds).
On a rate of reaction graph, what is plotted on the x-axis?
Show answer
Time.
State the equation for rate of reaction using reactants.
Show answer
Rate = quantity of reactant used ÷ time taken.
When calculating rate of reaction, quantities are measured in g or cm³ and time is measured in ?.
Show answer
seconds
Want to create your own cards? Create a free account. AI generation uses credits.