Properties of Water – Day 2 Kline Biology

Think of some examples of things that can dissolve in water! Universal Solvent Water is referred to as the universal solvent because it can dissolve any polar substance Think of some examples of things that can dissolve in water!

Polar vs. Nonpolar Polar molecules – have a charge (Salt, Sugar, Oxygen, Carbon Dioxide) Nonpolar molecules – do not have a charge (Oils, Fats, Steroids, Wax, Cholesterol)

Mix it up! Solution – a mixture of substances that is the same throughout Homogenous – same throughout Heterogeneous – can be separated Solvent – the substance present in greater volume (usually water) Solute – the substance that dissolves (like salt or sugar)

Universal Solvent Lab https://www.youtube.com/watch?v=BS1VeH8u1n4

Bases (alkaline) – pH greater than 7 Neutral – pH of 7 Acids – pH less than 7 Bases (alkaline) – pH greater than 7 Neutral – pH of 7

Can you identify these substances based upon the pH?

States of Water

States of Water Solid – water molecules are evenly spaced apart making them less dense than water. Liquid – water molecules are densely compacted within a container Gas – water vapor molecules are free flowing in the atmosphere

Freezing Properties Ice is less dense than water, therefore it floats Water is the only substance that gets bigger when it freezes. https://www.youtube.com/watch?v= UukRgqzk-KE

How is this important to living things? Ice over a pond or lake Glaciers floating Discuss how these examples are important in terms of water’s freezing properties with your partner.