Exam 1 prep

Question 1

What holds atoms together?

Answer 1

Chemical bonds

Question 2

What is a particle?

Answer 2

A single unit of matter

Question 3

What is a pure substance>

Answer 3

A substance made out of only one type of element

Question 4

What is a molecule?

Answer 4

2 or more atoms combined (the same atoms)

Question 5

What is a compound?

Answer 5

A molecule thing (2 or more atoms combined) but its with different particles

Question 6

What are mixtures?

Answer 6

Substances with several different types of atoms

Question 7

What is the formula for density?

Answer 7

mass/volume

Question 8

What is (in this case an example of) the % abundance formula?

Answer 8

(# of beads of one color/total # of beads)/100

Question 9

What is the SIMPLE average atomic mass (in beads)?

Answer 9

(mass of 1 blue bead + mass of 1 yellow bead + mass of 1 red bead)/3

Question 10

What is the weighted average atomic mass (in beads)?

Answer 10

[(mass of 1 blue x %) + (mass of 1 yellow x %) + (mass of 1 red x %)]/100

Question 11

What is the weighted average atomic mass (in beads)?

Answer 11

[(mass of 1 blue x %) + (mass of 1 yellow x %) + (mass of 1 red x %)]/100

Question 12

What is the formula for mass number?

Answer 12

of protons + # of neutrons

Question 13

What are isotopes?

Answer 13

Atoms that have the same # of protons but different #s of neutrons

Question 14

What kind of charge to cations have?

Answer 14

Positive

Question 15

What kind of charge do anions have?

Answer 15

negative

Question 16

What happens to the atomic radius as you go across?

Answer 16

It decreases

Question 17

What happens to the atomic radius as you go down?

Answer 17

It increases

Question 18

What happens to ionization energy as you go down?

Answer 18

It goes down

Question 19

What happens to ionization energy as you go across?

Answer 19

It increases

Question 20

What happens to electronegativity as you go down?

Answer 20

It decreases

Question 21

What happens to electronegativity as you go across?

Answer 21

It gets stronger

Question 22

What happens when 2 atoms have very different electronegativity?

Answer 22

Ionic bonding happens

Question 23

What happens when 2 atoms both have low electronegativity?

Answer 23

Metallic nonding

Question 24

What happens when 2 atoms have very high electronegativity?

Answer 24

covalent bonding