Slide 1Whats so special about water? Its a great solvent. It holds tons of heat. It has high surface tension. Its less dense as a solid than a liquid. Water, pH and Biological…

Unit3 Teenage problems Reading（1） What’s your biggest problem? Getting too many tests and exams. Not doing enough exercise Too noisy at home Having no close friends…

Reminders… Remember, essay needs to be in PEN. Multiple choice is in PENCIL. No calculators. Always write in essay format. Complete sentences. If you make a diagram, refer…

Unit3 Teenage problems Reading（1） What’s your biggest problem? Getting too many tests and exams. Not doing enough exercise Too noisy at home Having no close friends…

Soil Acidity and Review of Colloid Charge Mineral Charge Positive charge Al3+ Si4+ Negative charge OH- O2- âPerfectâ Mineral = Si Al Tetrahedral Substitution Al3+ for Si4+…

Unit 3 Teenage problems What should I do? Millie not get enough sleep, feel tired in class Simon not have enough time to do … homework Kitty be noisy at home, be always…