Learning objective
Rearrange equations and use algebra in physical chemistry.
Read the explanation, check the common trap, then practise with flashcards and questions.
At a glance
0
Flashcards
0
Questions
Topic
Mathematical requirements and assessment objectives
Subtopic
Mathematical requirements
Study support
Understand this objective
Quick explanation
Rearrange equations and use algebra in physical chemistry
- This point belongs to Mathematical requirements and assessment objectives, especially Mathematical requirements.
- You need to be able to rearrange equations and use algebra in physical chemistry.
- The key ideas to know are algebra.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect Mathematical requirements to exam-style questions, flashcards, and revision notes for Mathematical requirements and assessment objectives.
Quick student answer
What is the value of Kc for the equilibrium reaction: N2(g) + 3H2(g) ⇌ 2NH3(g) at 25°C if the concentrations at equilibrium are [N2] = 0.5 mol/dm³, [H2] = 0.1 mol/dm³, and [NH3] = 0.2 mol/dm³?
Direct answer
The equilibrium constant Kc is calculated using the formula Kc = [NH3]^2 / ([N2][H2]^3). Substituting the values gives Kc = (0.2)^2 / (0.5 * (0.1)^3) = 0.04 / 0.0005 = 80.
Key terms
- Equilibrium Constant (Kc): A numerical value that expresses the ratio of the concentrations of products to reactants at equilibrium for a reversible reaction.
- Boyle's Law: A gas law stating that the pressure of a given mass of gas is inversely proportional to its volume at constant temperature.
Common trap
Incorrectly applying Kc calculations: Always ensure to apply the correct stoichiometric coefficients from the balanced equation when calculating Kc.
Related questions
Try this as a practice card
Question 1 of 3
Choose an answer, get feedback, then move sideways through the set.
Flashcard prompts
Flip through the key recall cards
Flashcard 1 of 3
Revision tools
Choose how to practise
Flashcards0 linked cards
Practice Questions0 linked questions
Revision notestopic notes
Open the full topic revision notes when you are ready to review this objective in context.
Open revision notesRelated learning objectives
- Use arithmetic and numerical computation in chemical calculations.
Mathematical requirements
- Handle data, units, standard form, significant figures and uncertainty.
Mathematical requirements
- Plot, interpret and analyse graphs.
Mathematical requirements
- Apply geometry or trigonometry where required by chemical contexts.
Mathematical requirements
- Demonstrate knowledge and understanding of scientific ideas, processes, techniques and procedures.
Assessment objectives and paper structure