Summary: Chemistry H
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1 Polarity (VSEPR
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What do you think of when you hear the word "polar"?
North/south (opposites) -
Why does one element pull harder on the electron than the other in a polar covalent bond?
One element is pulling harder on the electron than the other due to electronegativity. -
How does greater electronegativity affect an atom?
Atom with the greater electronegativity pulls the electrons closer, giving it a partial negative charge; atom with less electronegativity releases electrons forming a partial positive charge. -
What factors does the polarity of a molecule depend on?
- Structural formula/shape of molecule
- Polar bonds
- Separation of charge into oppositely charged poles
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What is the shape with 3 atoms on the central atom and 1 lone pair?
Trigonal Pyramidal- # of atoms on central atom: 3
- # of lone pairs on central atom: 1
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2 INV 2 - INV 4
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What are the safety symbols shown in the document?
- Toxic
- Corrosive
- Toxic to the environment
- Flammable
- Irritant
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What safety precautions must you take while handling potassium iodide according to the SDS sheet?
Wear PPE goggles, apron, & chemically resistant gloves. Work in a well-ventilated area. Hazardous to organs through prolonged exposure, carcinogen. Dispose of waste through HAZMAT service. -
How do particles behave in a liquid?
Fluid, particles slide past each other, constant volume, changes shape. -
How do particles behave in a gas?
Fast moving particles are freely moving and expand to fill container. -
What are pure substances composed of according to the document?
All particles are identical. Pure substances include elements (on PT) and compounds. Elements like Na, O2, H2. Compounds like H2O, 2 or more elements chemically bonded.
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