Moles 1.1.1

• What is the last exam year mentioned for OCR Economics?

  2025
• What does "Past Papers" provide for students?

  Previous exam questions for practice
• What is the focus of the "Dance" section?

  Past papers and revision notes
• Why are "Revision Notes" crucial for students?

  They summarize key concepts for efficient study
• What is the last exam year mentioned for Edexcel Geography?

  2025
• What does "Flashcards" help students with?

  Quick recall of important information
• What is the focus of the "Media Studies" section?

  Past papers and revision notes
• How does the study material categorize "Other Subjects"?

  By providing various subjects not listed elsewhere
• What is the last exam year mentioned for OCR Religious Studies?

  2025
• What is the significance of the "Exam Questions" for students?

  They provide practice for real exam scenarios
• What is the focus of the "Accounting" section?

  Exam questions and revision notes
• Why are "Past Papers" important for exam preparation?

  They help students understand exam formats
• What is the last exam year mentioned for Edexcel Music?

  2025
• What does "Further Maths" include in the study material?

  Advanced topics and past papers
• What is the focus of the "Food & Nutrition" section?

  Revision notes and past papers
• How does the study material assist students in their exam preparation?

  By providing structured resources and practice
• What is the last exam year mentioned for Cambridge (CIE) Economics?

  2024
• What does "Revision Notes" provide for students?

  Summaries of key concepts for study
• What is the focus of the "Geography" section?

  Exam questions and revision notes
• Why are "Flashcards" useful for students?

  They help with quick recall of information
• What is the purpose of PAG 1 in A Level Chemistry?

  Determination of moles
• What is the first suggested practical for PAG 1?

  Determination of the composition of copper(II) carbonate
• How is the number of moles calculated in gas volume experiments?

  By measuring gas volumes produced in reactions
• What is the stoichiometric ratio used for in these experiments?

  To determine the final answer from moles
• What is the second suggested practical for PAG 1?

  Determination of the relative atomic mass of magnesium
• What is the third suggested practical for PAG 1?

  Determination of the formula of magnesium oxide
• How is the number of moles of magnesium and oxygen calculated in the magnesium oxide experiment?

  By measuring the mass of magnesium oxide produced
• What is the suggested practical for measuring changes in mass?

  Determining the formula of magnesium oxide
• What is the formula for calculating the number of moles of gas produced?

  n = v / 24.0
• Under what conditions is the gas volume calculation valid?

  At room temperature and pressure
• What is the molar ratio for the reaction of CuCO₃ and H₂SO₄?

  1. 1
• How can the mass of CuCO₃ be determined from the number of moles?

  Using the formula m = n x M_r
• What is a potential source of error in the gas collection experiment?

  Carbon dioxide escaping before sealing
• How can the escape of carbon dioxide be minimized?

  By sealing immediately after adding acid
• What are the suggested practicals for PAG 1 - Moles Determination?

  • Determination of the composition of copper(II) carbonate
  • Determination of the relative atomic mass of magnesium
  • Determination of the formula of magnesium oxide
• What methods are used to determine moles in practicals?

  1. Measuring gas volumes
  2. Measuring changes in mass
• What is the volume of 1 mole of gas at RTP?

  24.0 dm³
• Under what conditions is the gas volume calculation correct?

  At room temperature and pressure (RTP)
• What should be used if the calculation is not at RTP?

  Rearranged ideal gas equation
• What is the overall equation for the reaction of copper carbonate with sulfuric acid?

  CuCO₃ + H₂SO₄ → CuSO₄ + H₂O + CO₂