Biomolecules

Warmup Thursday 9/21/17When watering plants, where do we tend to pour the water? How does that water reach the whole plant?

“Usually, water is poured on the ___________ of plants.”

“The water reaches the whole plant by…”

Think, Pair Share

• Think quietly to yourself about the following question.

“When does 1 + 1 = 1?”• Share your thoughts with a partner.

• Share out to the class.

Pretty Penny Lab

• How much water fits on a penny?• Groups of 2• One person in each group gets a penny and a

pipet.• Beaker of water at each lab station, 4 groups can

share.• See which partner can fit more drops of water on

the penny.• Perform several trials.• Clean up lab station when done.

Pretty Penny Lab

• What did you observe?• Why did that happen?

In solid form, water is less dense than its liquid form

Think, Pair Share

How do fish survive in frozen lakes?

• https://youtu.be/3jwAGWky98c• https://youtu.be/CCxbI1qRsWY•

Warmup Friday 9/22/17Describe the water molecule in this illustration. What are the main parts? Why is one atom frowning while the other two are smiling?

Water and plants

“The water molecule is made up of…”

“The red atom is _________, and is frowning to represent _________, while the white atoms are _________ and have a __________ charge.”

Polar

Molecule with an unequal distribution of charge

Cohesion

Molecules of the same compound sticking together

Surface Tension

The elastic tendency of a substance when its molecules are attracted to one another

Adhesion

Molecules of different substances sticking together

Think, Pair Share

What is happening here, and why?

Capillary ActionWhen liquid flows in a narrow space without external forcesCan even go against gravity

Hydrophobic

Hydro = waterPhobic = afraid ofNONPOLAR Molecules that repel or fail to mix with water

https://youtu.be/i3jA40arq9Y

Hydrophilic

Hydro = waterPhillic = likingTendency to mix with or dissolve in waterPOLAR molecules are hydrophilicSolvent = the substance that does the dissolving (water)Solute = the substance that gets dissolved (salt)

I’M PHILIC MYSELF

Test Corrections

• All test corrections are due Wednesday, Sep 27• Hand-written on lined paper• Use complete sentences• Opportunity to earn back half the points missed

• 66% on the test• missed 34 points• can earn back 17 points • new score of 83%

• Must include original scantron with corrections• Where is the test located?

Period 2 Test stats

A

B

C

D

F

Period 5 Test stats

Period 6 Test stats

Warmup Monday 9/25/17

When watering plants, where do we tend to pour the water? How does that water reach the whole plant?

Answer this question again, using some terms from your Properties of Water chart.

“Water travels up a plant because of ___________, which is…”

Hydrogen Bonds

Attraction BETWEEN moleculesFormed between positively charged (+) Hydrogen and negatively charged (-) atoms

Attraction between water molecules = __________Attraction between water molecule and CO2molecule = ____________

Properties of Water

• Polar• Cohesion• Surface Tension• Adhesion• Capillary Action• Hydrophobic• Hydrophilic

With your group, make a miniature poster about your term. Include the definition, a diagram or image, and an example of the

property in action.

Make sure all your group members’ names are on the back.

Evaporative Cooling

Evaporation:liquid water water vapor (gas)

Gas molecules have higher energy (heat), take that heat with them, leaving the surface cooler.

Think, Pair Share

Rank each of the materials (A-F) from lowest to highest temperature

A

B

C

DE

F

Specific Heat

• The amount of heat required to increase the temperature of a substance

• Water has a HIGH specific heat. It resists temperature change.

A

B

C

DE

F

Universal Solvent

Solvent: something that dissolves other substances

Water dissolves more substances than any other liquid

Think, Write, Pair share

What is happening in this picture? Explain using some properties of water.

What do you think will happen after the beaker is left alone in a room for one hour?

Write your response on the back of your worksheet, and turn it in.

Test Corrections

• When are they due? • Wednesday!

• Can they be typed?• No! Must be hand-written.

• Do you need to write complete sentences?• YASS!

• Where is the test located?• Emcullen.weebly.com

Group Projects

Make the necessary changes to your projects on Google Slides by Friday, Sep 29 and I will give you points back. I will be checking them again this weekend and adjusting grades.