Cohesion, Adhesion, and Surface Tension Properties of Water: Cohesion, Adhesion, and Surface Tension

Warm Up NEW PAGE 1 November 1 What happens to the volume of water when it changes from a liquid to a solid? What two factors determine the way in which water flows over land? How do aquifers clean water? What is solubility? Describe two ways in which temperature can affect the solubility of a solute… Objectives: TSW understand the properties of water including cohesion, adhesion, and surface tension. Essential Question: What is the difference between cohesion and adhesion?

Warm Up November 2 What is the difference between cohesion and adhesion? If an object is more dense than water (1g/ml), how can an object float on top? Objectives: 8.E.1.1/1.2 -TSWU 2 factors that cause ocean currents and how these currents regulate Earth’s climate. Essential Question: -What causes ocean currents?

Warm Up NEW PAGE 1 October 27 What happens to the volume of water when it changes from a liquid to a solid? How can geologists determine that the Earth is 4.5 billion years old? What two factors determine the way in which water flows over land? How do aquifers clean water? Explain why organisms die and disappear without leaving a trace of their existence. Objectives: TSW understand the properties of water including cohesion, adhesion, and surface tension. Essential Question: What is the difference between cohesion and adhesion?

Warm Up February 3 What is the difference between buoyancy and surface tension? What is the difference between Cohesion and Adhesion? Objectives: -TSW understand the properties of water including specific heat and density.

Objectives TSW understand the different properties of water. Cohesion, Adhesion, Surface Tension, and Capillary Action TSW understand specific heat as it relates to water and other substances.

Warm-up 2/2/2012 1. What is surface tension and provide an example. 2. What property of water allows more dense objects to float in water? Explain your answer. Objectives: TSW- understand the concepts of surface tension, cohesion and adhesion -TSW understand capillary action by designing their own experiment

Objectives 1/31/2011 TSW -understand the concepts of surface tension, cohesion and adhesion -explore capillary action by designing their own experiment

Objectives January 28 TSW understand 3 properties of water: Cohesion, Adhesion, and Surface Tension. TSW understand buoyancy by molding clay to make it float.

Warm Up January 30 What is the difference between cohesion and adhesion? How do more dense objects float on water? Objectives: -TSW understand the concepts of cohesion, adhesion, and surface tension. -TSW understand buoyancy by molding clay to make it float in water. EQ: What is buoyancy?

Buoyancy Reflection Questions – Notebook Entry Page 5 Draw an illustration of your design. What happened to the clay when you first placed it into the water? What did you do to make your clay sphere float? How do you think you can improve your design? What is buoyancy? AND How was buoyancy displayed in this lab activity?

Warm Up January 26, 2012 What is chromatography? Describe the process of capillary action. Provide one example. Objectives: -TSW understand three different properties of water. Cohesion, Adhesion, and Surface tension Essential Question: -What are the three properties of water?

Objectives 1/26/2012 TSW understand three different properties of water. Cohesion Adhesion Surface Tension

Cohesion The ability of water molecules to stick to other water molecules is known as cohesion. Puddles of water on a flat surface Cohesion is responsible for the tension on the surface of water that permits you to fill a glass with water beyond the top.

Adhesion The ability of water molecules to stick to other types of molecules. Water droplets on a car windshield

Surface Tension The pull on the surface of liquids caused by the attraction of the molecules to one another. Surface Tension makes it seem that there is a thin, elastic cover on the liquid. It allows insects to walk on water.

Buoyancy The upward force on an object in a liquid or gas. Buoyancy allows boats to float and makes a rock feel lighter in water than in air. Buoyancy- if an object pushes away more water weight than its own weight then the object will float.

density Amount of matter present in a given volume D=m/v Styrofoam metal

Capillary action Rise of a liquid through a tiny opening or tube Capillary action gives plants the ability to absorb water from the ground.

Capillary Action Lab Report Question / Identify Problem - Given 3 different brands of paper towels, which one will display capillary action the best? Hypothesis -Choose A,B, or C and provide support for your hypothesis Design an Experiment - List your procedures step-by-step Data Collection and Analysis- Write down what you observe and try to explain why Conclusion – Summarize what happened. Was your Hypothesis correct? Reflection Questions

Capillary Action Lab Report Step 1: Label paper towels A, B & C. Step 2: Fill 1 clear cup with about an inch of colored water . Step 3: Dip a quarter inch of paper towel A in the colored water. Step 4: Time for 30 seconds and record your data. Step 5: Repeat steps 1-4 for paper towel B and paper towel C. Record all data. Step 6: Complete your Capillary Action Lab Report and turn it in. Include both refection questions.

Data Collection and Analysis Paper Towels Time Observations A B C

Reflection Questions – Write and answer on the back of your lab sheets. A. What were the variables for each of the experiments? B. What was the independent variable for experiment 1 and 2? C. What was the dependant variable for experiment 1 and 2? D. What is the difference between cohesion and adhesion? E. What property of water is responsible for surface tension?

Specific Heat Specific heat is another physical property of matter. The temperature of matter is a direct measure of the motion of the molecules: The greater the motion the higher the temperature: The energy required to raise the temperature of one gram of any substance 1 degree Celsius.

Homework Describe the following terms: Provide 1 example for each Buoyancy Capillary Action Specific Heat Provide 1 example for each Half a page minimum

Bill Nye: Oceanography Word Bank -1.5 -Heat -4 -Siberia -Water -Food -Ocean Currents -Oxygen -Density -Norway -Rain -Salt Water -Sun -Clockwise -Wind -Gulf Stream -Britain -Movement or transportation -Equator -Mt. Everest