Water vapor investigation 3-3

Focus Question: What items affect evaporation rates?

Water PlanetInvestigations 3-2 & 3-3

Drying Up Questions

What is water vapor?

Where is water vapor?

What does water vapor look like?

What happens when a wet object gets dry?

Does Location Affect Evaporation?

Where might we put the wet paper towel so it would dry quickly?

Where would it dry slowly?

How can we find out how fast water will evaporate in these locations?

Does Surface Area Affect Evaporation?

Compare size of openings for each container

Area of the water touching the air is surface area

In which container will water have the largest surface area?

In which container do you thing water will evaporate fastest?

Variables and Controlled Experiments

Anything you can change in an experiment that might affect the outcome of the experiment is a variable

A controlled experiment is an experiment in which one, and only, one variable is changed in order to find out how it affects the outcome of the experiments. All other variables are kept the same, or controlled.

Surface-Area Experiment

If you want to find out if surface area affects the amount of evaporation, how would you set up the investigation?

What variables will you control?

What variable will you change? ~

Evaporation Place Mat-4 containers

Label mat, position tray and containers

Add 25-ml of water to each container

Location Experiment

Label four cups (A, B, C, D and room/group number)

Measure 50-ml of water in each cup

Place each cup on matching letter tray

Monitor temperature twice each day

Record temperature on class chart

Location

Determine the amount of water that evaporated from each cup. Measure amount

remaining, subtract from starting amount

Use a graduated cylinder to measure volume of water

Plan procedure, then begin

Record measurements/results on Evaporation Location Charts - charts 1 and 2, answer Q1-4

Share information with Surface Area group (1-2, 3-4, 5-6, 7-8)

Complete Surface Area Chart and questions

Surface Area

Complete first two rows of chart - surface area ranking, beginning water

Measure and record amount of water remaining - begin with graduated cylinder

Calculate amount of water lost to evaporation

Order empty containers from greatest to least amount of evaporation

Compare amount of evaporation to surface area for each container - rank containers in row 5; answer Q1-2

Share information with Evaporation Location groups (1-2, 3-4, 5-6, 7-8)

Complete Evaporation Location Charts and questions

Wet Paper Towel

Describe the best way to dry a wet paper towel. Consider location and surface area in your answer.

Vocabulary Seriate

To put objects in order by one property, like the amount of water left.

Thermometer A tool used to measure

temperature.

Surface Area The area of liquid exposed to or

touching the air.

Content Where did the most evaporation happen?

Where did the least evaporation happen?

What is the relationship between temperature and evaporation?

How does surface area of a volume of water affect evaporation?

Your Questions?

Homework: Read Evaporation, pg 184-186 + answer questions. I-check 3 on Friday 1/17

Evaporation Questions

What causes evaporation?

Why does warm water evaporate faster than cold water?

How is water vapor different from liquid water?

How does temperature affect the amount of water vapor in the air?