Atoms Bond to Form Molecules

Question 1

Chemical bond

Answer 1

attractive force that links atoms together to form molecules

Question 2

Covalent bond

Answer 2

atoms share one or more pairs of electrons so that outer shells are filled

Question 3

Compound

Answer 3

pure substance made of two or more different elements

Question 4

Molecular weight

Answer 4

sum of atomic weights of all atoms in the molecule

Question 5

Are bond energies higher or lower in multiple covalent bonds?

Answer 5

higher

Question 6

Sharing of electrons in covalent bonds are always equal. True or False?

Answer 6

False

Question 7

Electronegativity

Answer 7

attractive force that atomic nucleus exerts on electrons

Question 8

What are the factors that electronegativity depends on?

Answer 8

of protons, distance between nucleus & electrons

Question 9

Non-polar covalent bond

Answer 9

electrons are shared equally (similar electronegativity)

Question 10

Polar covalent bond

Answer 10

one atom has greater electronegativity, electrons drawn closer to nucleus

Question 11

Ion

Answer 11

atom with electric charge as a result of the loss or gain of one or more electrons

Question 12

Cation

Answer 12

positive ion

Question 13

Anion

Answer 13

negative ion

Question 14

Complex ions

Answer 14

groups of covalently bonded atoms that carry a charge
Ex: NH4+, SO42-

Question 15

Ionic bonds

Answer 15

electrical attraction between positive and negative ions

Question 16

Hydrogen bond

Answer 16

attraction between - end of one molecule & + hydrogen end of another molecule

Question 17

Hydrophilic

Answer 17

polar molecules form hydrogen bonds with water

Question 18

Hydrophobic

Answer 18

non-polar molecules that resist water

Question 19

Hydrocarbons

Answer 19

non-polar molecules

Question 20

van der Waals forces

Answer 20

attractions between non-polar molecules that are close together