Kinetic or Potential and Exothermic or Endothermic
Lewis Dot Diagrams
Electronegativity Polarity & Dipoles
Intermolecular Forces
VSEPR
100
Kinetic or Potential? When a snowball is being thrown.
What is kinetic energy?
100
The rule that states all atoms want 8 valence electrons to be stable.
What is the octet rule?
100
The type of molecule that has electrons that are shared equally.
What is nonpolar? (Nonpolar molecules share electrons equally. They are symmetrical and attract electrons equally.)
100
The strongest INTERmolecular force.
What is hydrogen bonding?
100
This molecule shape has a central atom with two atoms and no line pairs of electrons around it.
What is linear?
200
Kinetic or Potential? The energy in a chemical bond.
What is potential energy?
200
What are the elements that don't need 8 valence electrons in order to be stable? How many valence electrons do these atoms need?
What is Hydrogen and Helium? They need 2 What is Boron? It needs 6.
200
True/False: Water is polar, so it dissolves polar substances.
What is true? Like dissolves like. Polar substances dissolve polar substances, and nonpolar substances dissolve nonpolar substances.
200
Which represents an INTRAmolecular force: dash (-) or squiggle (~~)? H-Cl~~H-Cl
What is dash (-)? The dash represents a covalent bond. The squiggle would represent the intermolecular force. (in this case, dipole-dipole)
200
The shape of a carbon dioxide (CO2) molecule
What is linear?
300
Endothermic or Exothermic? When more energy is needed to break the bonds in a chemical reaction then energy needed to form bonds.
What is Endothermic?
300
What makes this Lewis dot structure incorrect? H=C=H
What is hydrogen atoms having too many valence electrons/bonds? Hydrogen only needs two valence electrons or a single bond. H will never have a double bond.
300
Does the molecule H-F exhibit a dipole? Explain why.
What is YES, there is a dipole? Each side is different, so the fluorine would attract the electrons more than the hydrogen. Flourine would be slightly negative and hydrogen would be slightly positive: a dipole!)
300
The type of intermolecular force that would hold two CH4 molecules together.
What is London dispersion forces. (CH4 is a nonpolar molecule.)
300
The substitute in a trigonal planar molecule
What are only 3 atoms?
400
Why do the products have more energy than the reactants in an endothermic energy diagram?
What is absorbing or gaining energy from the surroundings?
400
What is incorrect about the Lewis dot structure of the hydroxide ion? O-H
What is not having brackets with the charge outside in the upper right AND 6 valence electrons around oxygen?
400
The polarity of this molecule: CH4
What is nonpolar? (Substituents are the same and it is symmetrical.)
400
The type of intermolecular force that would hold two SiH3Br molecules together.
What is dipole-dipole? (This is a polar molecule that does not have H-F, H-O, or H-N)
400
The shape of SH2?
What is bent?
500
Endothermic or Exothermic? Melting paraffin wax. Explain what is happening to the energy of the wax particles.
What is endothermic? The particles of wax (solid) are closely packed and slowly moving. The particles need to ABSORB energy in order for the particles to spread out and move around faster as a liquid.
500
What the Lewis dot structure for HCN looks like.
What is H (single bond) C (triple bond) N?
500
Is this molecular polar or nonpolar: NH3
What is polar? (There will be an unequal sharing of electrons. N side will be partially negative and H will be partially positive. This molecule is not symmetrical.
500
Which of these substances would have the lowest melting point: CCl4 or HF?
What is CCl4? HF would have hydrogen bonding holding molecules together (there is a H-F), while CCl4 would have london dispersion forces. London Dispersion is weaker and will melt quicker.
500
What is the shape of NCl3?
What is trigonal pyramidal?
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