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Lesson 7.9 How do Gecko's Defy Gravity and IMF Organizer

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Watch the video and answer the embedded questions. This video has a great explanation of how dispersion forces work in real-life.

Instrukcije

Watch the video and answer the embedded questions. This video has a great explanation of how dispersion forces work in real-life.

To finish this assignment, you should pick up the IMF graphic organizer in class and fill it out to create focused notes for the week. Some notes are added below to help you understand how to fill out the organizer.

Compare and contrast the different types of forces in these three boxes

Make yourself a table. What type of bonds does each of these covalent compounds make

How does each of the intermolecular forces affect the properties of a substance. High or Low is fine.

Questions 1-3

00:54

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Question 4

01:15

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Question 5

01:46

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3

Question 6

02:08

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2

Question 7

02:21

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1

Questions 8 & 9

03:07

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1

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1

Questions 10-12

03:37

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Question 13

04:18

2

Make sure you have an explanation or a diagram that explains why oil has good adhesion (sticks to itself) or geckos can stick to ceilings. Remember dispersion forces are tiny, but alot of dispersion forces can really add up.

Pitanje 1

1.

What makes geckos unique in their ability to climb surfaces?

They use intermolecular forces and structural engineering

They have special claws that grip surfaces

They use super-powered spiderwebs

They have sticky glue on their feet

Pitanje 2

2.

What fundamental principle explains how geckos stick to surfaces?

Surface tension

Static electricity

The attraction between positive and negative charges

Magnetic attraction

Pitanje 3

3.

Why doesn’t a gecko’s foot or the surface it walks on have a charge?

They are made of neutral atoms and molecules.

The gecko uses an electrical discharge to neutralize charges.

The molecules repel charges instead of attracting them.

They are both positively charged, canceling out any attraction.

Pitanje 4

4.

What is electronegativity?

The strength with which an atom attracts electrons.

The force of attraction between two oppositely charged atoms.

The number of electrons an atom has.

The ability of an atom to lose electrons.

Pitanje 5

5.

(Choose all that are correct) A molecule with positively and negatively charged patches because of a strongly electronegative atom is

a neutral molecule

has a dipole

a polar molecule

a nonpolar molecule

a polyatomic ion

Pitanje 6

6.

Choose all the phrases that finish the sentance to make a correct statement. Electrons in a molecule

are constantly moving

are always uniformly spread through the molecule (dispersed)

always stay in the center of the bond

can temporarily pile up in one spot

are fixed in certain places (they can't move)

Pitanje 7

7.

Van der Waals force are also called

hydrogen bonds

ionic bonds

covalent bonds

dispersion forces

Pitanje 8

8.

How do van der Waals forces help geckos stick to surfaces?

By aligning opposite charges in molecules to create attraction

By creating strong permanent charges that pull surfaces together

By releasing glue-like substances to create stickiness

By making the gecko’s foot chemically bond to the surface

Pitanje 9

9.

What structures on a gecko’s feet maximize van der Waals forces?

Sticky pads that secrete mucus

Claws with tiny hooks

Webbed toes that create suction

Hair-like structures called setae and spatulae

Pitanje 10

10.

Why are spatulae important for geckos’ ability to stick?

They generate static electricity to help geckos cling.

They produce a natural adhesive.

They increase surface area for van der Waals forces.

They allow geckos to hook onto rough surfaces.

Pitanje 11

11.

How does a gecko unstick its foot from a surface?

By retracting its claws from the surface.

By lifting its foot at a specific angle to break the attraction.

By secreting a liquid that dissolves van der Waals forces.

By shaking its foot rapidly.

Pitanje 12

12.

How strong is a gecko’s grip due to van der Waals forces?

It can support its entire body weight from a single toe.

It can lift objects heavier than itself

It can only stick to surfaces for a limited time.

It requires external pressure to stay attached.

Pitanje 13

13.

How has gecko adhesion inspired human-made technology?

Scientists have developed artificial adhesives that mimic gecko feet.

Engineers have created robotic geckos to test wall climbing.

Special gloves allow people to climb walls as easily as geckos.

Humans have modified gecko DNA to enhance grip strength.