U1S3 shapes of molecules

Question 1

What does the shape of a molecule depend on

Answer 1

• number of pairs of electrons in outershell of central atom
• whether the pairs are lone or shared

Question 2

What does valence shell electron pair repulsion theory state

Answer 2

• lone pair charge clouds repel more than bonding-pair charge clouds
• bond angles reduced as bonding pairs pushed together by lone pair repulsion

Question 3

Central atoms with two electron pairs

Answer 3

• linear
• 180 degrees

Question 4

Central atoms with three bonding pairs

Answer 4

• trigonal planar
• 120 degrees

Question 5

Central atoms with two bonding pairs and one lone pair

Answer 5

• non-linear
• just less than 120 degrees

Question 6

Central atom with four bonding pairs

Answer 6

• tetrahedral
• 109.5 degrees

Question 7

Central atom with three bonding pairs and one lone pair

Answer 7

• trigonal pyramidal
• 107 degrees

Question 8

Central atom with two bonding pairs and two lone pairs

Answer 8

• bent
• 104.5 degrees

Question 9

Central atom with five bonding pairs

Answer 9

• trigonal bipyramidal
• 120 and 90 degrees

Question 10

Central atom with four bonding pairs and one lone pair

Answer 10

• seesaw
• 102 and 86.5 degrees

Question 11

Central atom with three bonding pairs and two lone pairs

Answer 11

• t-shape
• 87.5 degrees

Question 12

Central atom with six bonding pairs

Answer 12

• octahedral
• 90 degrees

Question 13

Central atom with five bonding pairs and one lone pair

Answer 13

• square pyramidal
• 90 degrees

Question 14

Central atom with four bonding pairs and two lone pairs

Answer 14

• square planar
• 90 degrees