Chemistry – Classes 16 & 17

Period B – Thursday-Friday, September 26-27

Exam Preparation

• Chapter 3 Exam on Friday
• Practice Problems from textbook
  • 41, 42, 53, 58, 67, 71, 73, 76
  • support every answer
• Big Ideas from the Chapter
  • Solids, liquids, gases all have different properties
  • Physical properties can be observed without altering substance
  • Chemical properties describe a substance’s ability to combine with other materials
  • Physical changes alter physical properties
  • Chemical changes involve changes in composition
  • Chemical reactions change reactants to products
  • Law of Conservation of Mass – the mass before a reaction equals the mass after a reaction
  • Mixtures are blends of substances in any proportion
  • Solutions are homogeneous mixtures
  • Mixtures are separated by physical means
  • Elements cannot be broke into simpler substances
  • Elements are organize don the periodic table
  • compounds come form combinations of elements
  • Law of Definite Proportion – the formula for a substance never changes
• If you can do the practiec problems then you can do the exam

Homework

• Study for the exam
• turn in the practice problems with the exam