Science - 2017-18
6.5 a-b - Properties of Water
The student will investigate and understand the unique properties and characteristics of water and its roles in the natural and human-made environment. Key concepts include
a) water as the universal solvent;
b) the properties of water in all three phases
Bloom's Levels: Analyze; Understand
- Matter can exist in several different states, including solids, liquids, gases, and plasma.
- Matter can be changed physically or chemically.
- I can explain why some substances dissolve in water and others don't.
- I can explain why ice melts on a hot day.
UNDERSTANDING THE STANDARD
- Among water's unique properties is that one side of each water molecule is slightly negative and the other is slightly positive. Individual water molecules, therefore, attract other water molecules like little magnets as the slightly positive portion of a water molecule is attracted to the slightly negative portion of adjacent water molecule. In this way, water molecules "stick together."
- due to water's plar nature, a large number of substance will "dissolve" in water. For this reason, water is often called the universal solvent.
- Water is the only compound that commonly exists in all three states (solid, liquid, gas) on earth. the unique properties of water are a major factor in the ability of our planet to sustain life.
- Additional properties of water are its high surface tension and the large range of temperature (0-100 degrees Celsius) in which it can be found in the liquid state, as well as the fact that, unlike other substances, solid water is less dense than liquid water.
In order to meet this standard, it is expected that students will
a) comprehend and apply key terminology related to water and its properties and uses.
design an investigation to demonstrate the ability of water to dissolve materials.
comprehend the adhesive and cohesive properties of water.
b) model and explain the shape and composition of a water molecule.
compare the effects of adding thermal energy to the states of water.
explain why ice is less dense than liquid water.
relate the three states of water to the water cycle.
universal solvent, solute, adhesion, cohesion, density, surface tension, solvent