Lesson 7.9 How do Gecko's Defy Gravity and IMF Organizer
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13 questions
Note from the author:
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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 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.
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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.
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
What fundamental principle explains how geckos stick to surfaces?
Surface tension
Static electricity
The attraction between positive and negative charges
Magnetic attraction
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.
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.
(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
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)
Van der Waals force are also called
hydrogen bonds
ionic bonds
covalent bonds
dispersion forces
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
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
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.
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.
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.
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.
