exam one

Question 1

what is the difference between an element and a compound?

Answer 1

an element is a pure substance that can not be broken down, while a compound is made up of two or more (elements, atoms, substances, etc) and can be broken down.

Question 2

what is the difference between pure substances and mixtures?

Answer 2

a pure substance is made up of one component, while mixtures are made up of two or more.

Question 3

what is the difference from a solution/homogeneous mixture to a heterogeneous mixture

Answer 3

a heterogeneous mixture is where the composition varies from one region to another, while a solution/homogenous mixture is uniform throughout.

Question 4

what is one inch in cm

Answer 4

2.54 cm`

Question 5

what is one kg in lb

Answer 5

2.205 lb

Question 6

what is one mol of particles equal to?

Answer 6

6.02x10^23 particles

Question 7

what is one gal in L

Answer 7

3.785 L

Question 8

what is a physical property

Answer 8

a property that shows without changing composition (ie: melting or freezing)

Question 9

what is a chemical property

Answer 9

a property that shows after/during a change in composition (ie: apples turning brown after being cut)

Question 10

what is an extensive property

Answer 10

volume, mass or size. depends on the size

Question 11

what is an intensive property

Answer 11

density, state, or temperature. does not depend on the size.

Question 12

What do elements B, Si, Ge, As, Sb, Te, and At all have in common?

Answer 12

they’re all semimetals

Question 13

what does c stand for and equal?

Answer 13

speed of light, 3.00x10^8 m/s

Question 14

what does h and for and equal?

Answer 14

placks constant, 6.626x10^-34 J/s

Question 15

what is the equation for speed of light?

Answer 15

λv (wavelength x frequency)

Question 16

what is the equation for energy per photon?

Answer 16

E= hv

Question 17

what is the equation for wavelength (λ)

Answer 17

λ= speed/frequency

Question 18

what does n stand for? L? ml?

Answer 18

n- the principle quantum number (ie, the size of an electron, be it 2s or 3s)
l- the angular momentum quantum number (ie, the orbital an electron occupies, be it s, p, d, or f)
ml- the energy levels in a subshell

Question 19

true or false: the atomic radii gets smaller from left to right

Answer 19

true

Question 20

does ionic radii get bigger or smaller from left to right?

Answer 20

bigger.

Question 21

what does ionization energy do?

Answer 21

increases from left to right, and decreases from top to bottom

Question 22

what does electron affinity do?

Answer 22

increases upward and left to right.

Question 23

what’s ionization energy

Answer 23

the energy required to remove an electron from a neutral atom

Question 24

what’s electron affinity?

Answer 24

the energy change when a neutral atom attracts an electron

Question 25

what is shielding?

Answer 25

]when the outer electrons are repelled by the core electrons

Question 26

what is effective nuclear charge

Answer 26

the attraction of positive charged protons acting on valance electrons

Question 27

what is coulombs law?

Answer 27

E= 1/(4pi^eo)x (q1q2)/r

Question 28

what is is the volume of a cylinder

Answer 28

pihr^2

Question 29

what is the equation for distance?

Answer 29

speed x time

Question 30

mass is a ______ property

Answer 30

physical

Question 31

volume is a ______ property

Answer 31

physical

Question 32

magnetism is a ______ property

Answer 32

physical

Question 33

melting is a ______ property

Answer 33

physical

Question 34

reactivity is a ______ property

Answer 34

chemical

Question 35

as the wavelength decreases, the frequency _____

Answer 35

increases

Question 36

as the probability of finding an electron in an orbital increase, the boundary surface diagram __________

Answer 36

increases

Question 37

it is _________ to drive a boundary surface diagram of 100%

Answer 37

impossible

Question 38

what does the s orbital look like?

Answer 38

a sphere

Question 39

what is the shape of a p orbital

Answer 39

two eggs beside eachother

Question 40

what does the d orbital look like

Answer 40

a clover

Question 41

what pattern is the electron configuration?

Answer 41

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p6

Question 42

shells (n) determine the ____ of an orbital

Answer 42

size

Question 43

where should electrons be removed from?

Answer 43

the s orbital

Question 44

what is the equation for ionization energy

Answer 44

X(g) + IE1 = X^+(g) + e-

Question 45

what is the equation for electron affinity

Answer 45

X(g)+ e- = X-(g) + EA