Exam 1

Question 1

2) How much energy is contained in 1 mole of 552 nm photons.

What equation would you use for this example

Answer 1

E= h (c/lambda)
E being energy
h being constant
c being speed of light
lambda being wavelength = given usually within problemm

Question 2

When you lose an electron you get

When you gain an electron you get

Answer 2

lose = cation

gain = anion

Question 3

out of proton, neutron, and electron, which has the smallest mass

Answer 3

electron has the smallest mass

proton and neutron = same

Question 4

What is an isotope

Answer 4

atoms with same number of protons but dif number of neutrons

Question 5

What is an ion

Answer 5

when atom gains or loses electrons to become charged particles (cation, anion)

Question 6

Calculate the wavelength (in nm) of the blue light emitted by a mercury lamp with a frequency of 6.88 × 1014 Hz.

what is the equation would you use to start this problem

Answer 6

lambda = c/v

v being the frequency provided

Question 7

Calculate the energy of the red light emitted by a neon atom with a wavelength of 703.2 nm

what equation would you use to start this problem

Answer 7

E= h (c/lambda)

Question 8

Calculate the wavelength of an electron (m = 9.11 × 10-31 kg) moving at 3.66 × 106 m/s

what equation would you use to start this problem

Answer 8

lambda = h/ (m * v)

Question 9

Determine the energy change associated with the transition from n=2to n=5 in the hydrogen atom.

what is the equation that starts this problem

Answer 9

ΔE=-2.18 times 10 to the -18 J ((1/n squared (final)) - (1/n squared (initial))

Question 10

how do you convert nm to m

Answer 10

1 nm = 10 to the -9 m

Question 11

In regards to atomic radius what two directions indicate that the radius is increasing

Answer 11

down the graph and to the left = increasing

Question 12

What has the smallest radius between a cation, anion, or neutral

Answer 12

cation

Question 13

valance electrons refer to…..

Answer 13

to the electrons in the outermost energy cloud

Question 14

describe an atom

Answer 14

neutrons and protons in the nucleus with electrons surrounding in the electron cloud

Question 15

ions differ from atoms by the number of __________

Answer 15

electrons

Question 16

What are the possible orbitals for n=4

Answer 16

s,p,d,f

Question 17

what does the law of conservation of mass state

Answer 17

when a chemical reaction occurs, the total mass substances involved in the reaction does not change

Question 18

What does the law of definite proportions state

Answer 18

all samples of a given compound have the same proportions of their constituent elements
example = water breaks down into an 8:1 ration

Question 19

What are the 4 postulates of the atomic theory

Answer 19

1. each element is composed of tiny, indestructible particles called atoms
2. all atoms of a given element have the same mass and other properteries that distinguish them from the atoms of other elements
3. atoms combine In simple, whole number tatios to form compounds
4. atoms of one element cannot change into atoms of another element

Question 20

What did the gold foil experiment prove

Answer 20

the majority of space in atom = empty space
the atoms contains positively charged nucleus
the mass of atom is concentrated in nucleus
positive charge is considered in one location

Question 21

what is the amplitude

what is the wavelength

Answer 21

a= vertical height of crest

w= deistance between adjacent crests

Question 22

what is diffeaction

Answer 22

when wave encounters an obstacle that is comparable in size to its wavelength it bends around it

Question 23

what is mj to J

Answer 23

10 ot the -3

Question 24

how is the periodic table organized

Answer 24

atomic number

Question 25

name the levels of orbitals as If you were filling with electrons

Answer 25

1s,2s,2p,3s,3p,4s,3d,4p,5s,4d,4f,5p

Question 26

When taking elecrons away what is different from that then fillin

Answer 26

taking away you take away by energy level so all 4’s going before touching 3’s

Question 27

what is a ionic bond

what is a covalent bond

Answer 27

ionic= bond between metal and nonmetal

covalent = bond betweem two or more nonmetals

Question 28

a lewis structure refers to what?

What rule is associated with the lewis structure

Answer 28

lewis = representations of the elements with valence electrons the ones with the element letter with dots around it

octet rule- stable configuration is usually 8 e in the outermost shell

Question 29

As energy increases, frequency _________
as energy increases, wavelength ________ + gets ________
As energy increases, you go more towards the color ______

Answer 29

increase

decreases +gets shorter

purple