chapter 2

Question 1

property that distinguishes an atom of one element from another is :

Answer 1

number of protons (atomic #)

Question 2

if an atom has one valence electron it is most likely to form a:

• polar covalent bond
• two non polar covalent bonds
• two covalent bonds
• an ionic bond

Answer 2

ionic bond

Question 3

an atom with a net positive charge must have more:
protons
electrons
neutrons?

Answer 3

protons

Question 4

isotopes carbon 12 and carbon 14 differ in

Answer 4

number of neutrons

Question 5

which of the following is NOT a property of elements found in most living organisms

• low atomic mass
• atomic number less than 21
• eight electrons in outer level
• lacking one or more from outer level

Answer 5

full outer level

Question 6

ionic bonds arise from

Answer 6

attraction between ions of opposite charge

Na+ Cl- = NaCl

Question 7

solution with high concentration of H+ is:

Answer 7

an acid, LOW ph

Question 8

Nitrogen has three valence electrons , how many covalent bonds could it form

Answer 8

3

Question 9

a molecule with polar covalent bonds would be:

• soluble in water
• not soluble
• contain atoms with similar electro negativity

Answer 9

soluble in water

Question 10

if you shake a bottle of vinegar and oil, it will seperate into two phases because?

Answer 10

water organizes nonpolar bonds , the nonpolar oil is not soluble in water