Summary

• Description:

  The MS Word document comprises Grade 7 Integrated Science Paper 2 Term 3 2026 Opener Exam with Marking Scheme. The PDF version is also available upon your request. The marking scheme is towards the end of the file.

  This practical examination assesses learners' laboratory skills, experimental observations, indicator preparation, and chemical classification of household substances.

  • Duration: 2 Hours
  • Total Marks: 30 Marks
  • Number of Questions: 2 Practical Tasks (Task 1 and Task 2)
  • Structure: Task 1 (15 Marks) investigating thermal effects and boiling behavior of liquids, and Task 2 (20 Marks raw / scaled) classifying household substances using litmus indicators.

  It covers the following topics:

  • Task 1 (Investigating the Effects of Heating Common Liquids):
    • Observing boiling thresholds, vapor bubble dynamics, and steam formation
    • Physical transitions in states of matter (liquid to gaseous phase change)
    • Thermal behavior of other liquids (ethanol, paraffin, cooking oil)
    • Laboratory safety protocols when heating liquids and handling hot glassware
    • Practical domestic and industrial applications of changes of state
  • Task 2 (Classification of Household Substances Using Litmus Papers):
    • Testing common solutions (wood ash, lemon juice, baking powder, water, orange juice, sugar, toothpaste, vinegar, liquid soap) with red and blue litmus paper
    • Classifying tested household substances into acids, bases, and neutral substances
    • Behavior and chemical properties of neutral substances
    • Sourcing, extracting, and preparing organic acid-base indicators from plant parts (hibiscus, red cabbage)
    • Stability and decay properties of organic indicators
    • General chemical and physical properties of acidic and basic substances
• File Size:

  135.89 KB
• Length:

  5 pages
• Category:

  Exams
• Level:

  Grade 7
• Subject:

  Integrated Science
• Posted By:

  Caleb_Peter

Enter your details below to initiate a payment using MPESA.