exam 1

Question 1

The Avg atomic mass of an atom is determined by:

Answer 1

Taking a weighted average off all stable isotopic masses

Question 2

In the isotope Hg^203 how many neutrons are present

Answer 2

123 (203-80)

Question 3

As an electron moves closer to the nucleus, energy is:

Answer 3

released

Question 4

what is the equation to find frequency of a photon

Answer 4

Either
1- v=c/λ
2- v=E/nh

Question 5

what is the equation to find wavelength?

Answer 5

λ=c/v

Question 6

equation to find the # of photons

Answer 6

n=eλ/hc

Question 7

The pattern of characteristic wavelengths of light absorbed by and emitted from an atom is known as the atoms:

Answer 7

Atomic spectrum

Question 8

when finding the mass of one mole of an element/compound what is the unit used?

Answer 8

g/mol

Question 9

why in the atomic spectrum of hydrogen does 4.10210^-7 m have higher energy per proton than 6.56510^-7 m?

Answer 9

because in the equation E=h(c/λ)
E and λ have an inverse relationship
as λ goes down- E goes up

Question 10

An empirical formula is…

Answer 10

simplest ratio of elements in a compound

Question 11

Atomic # equals what in an element

Answer 11

of protons

Question 12

in neutral atoms (p+=?)

Answer 12

(p+=e-)

Question 13

If you change…
1- # of neutrons—>
2- # of protons —>
3- # of electrons —>

Answer 13

1-isotope of the element (mass# changes)
2- different element
3- ion of the element

Question 14

How do you find the # of neutrons in an element?

Answer 14

Mass # - Atomic #

Question 15

What is the nuclear charge based off of?

Answer 15

the # of protons

Question 16

What is the sig fig rule to addition and subtraction?

Answer 16

least # of decimal places

Question 17

What is the sig fig rule to division and multiplication?

Answer 17

least # of sig figs

Question 18

What are the l values for orbitals s,p,d,f in that order

Answer 18

0,1,2,3

Question 19

if l=1 what are the ml values?

Answer 19

-1,0,-1

Question 20

how many electrons fit into the orbitals s,p,d,f in that order

Answer 20

2,6,10,14

Question 21

1 mol of any element = what number?

Answer 21

Avogadro’s number

6.022*10^23 atoms or molecules

Question 22

The total mass of an element/compound in grams = what number?

Answer 22

1 mol of that element/compound

Question 23

the valence e- is found by…

Answer 23

finding the group (column) that the element is from

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