Conversions
How many grams are in 423.0 kg?
423000 g
More correct 4.23 X 105 (25 extra points)
What is a cation?
A positively charged atom
What are the Units we use for..
Energy?
Wavelength?
Frequency?
Energy- Joules
Wavelength- meters
Frequency- s-1 or hz (10 extra points for both:) )
What are the four types of orbitals present in an atom?
S, P, D, F
Who did the Cathode Ray Experiment?
Thompson
How many nanoliters are in 0.23 Megaliters?
2.3 x 1014 nm
Describe an Endothermic Reaction
Any chemical reaction where the system absorbs heat from the surroundings
What is the energy of a purple light particle if the frequency is 7.50x1014Hz?
E=5.00x10-19 J
How many electrons can the D orbital hold? How many can the S orbital Hold?
10
2
where are the halogens located on the periodic table?
Group 17
Convert 292 K to ºC
18.85 ºC
What is the phase change where a Solid Changes to a gas? Is it endothermic or Exothermic?
Sublimation, Endothermic
What is the wavelength of a photon if it has the energy of 3.45x10-10 J. Give answer in nanometers.
5.76x10-7nm
what is the FULL electron configuration for Calcium
1s22s22p63s23p64s2
Magnesium has three natural isotopes 24Mg 25Mg 26Mg, with atomic masses of 23.985042, 24.985837, and 25.982593 AMU respectively. If the average atomic mass of magnesium is 24.3060 AMU and 78.99% of all magnesium is 24Mg, what are the abundances of 25Mg and 26Mg?
25Mg=10.18%
26Mg=10.92%
How many moles of Titanium are in 15.24 Kg of titanium?
318.4 moles Ti
Is the melting of ice endothermic or exothermic? What is the system? what is the surrounding? Where does the energy flow?
Endothermic
System: Ice cube
Surrounding: air around the icecube
The energy gets transfered from the air into the ice cube
What is the energy of a mole of photons that have a frequency of 2.75 x10-14 s-1? Give your answer in units of kJ/mol.
110 kJ/mol
which orbital has an l value of 2
n-1 = l
Each member of your group must tell me 1 way they have been studying for this exam, or how you will be studying and none of the answers can repeat.
Slayyyyy
How many grams of nitrogen are in 2.5x109 nanograms of NO3-? Atoms?
0.565 grams of nitrogen
Give the electromagnetic spectrum in order from highest frequency to lowest frequency. And explain how this relates to wavelength.
Gamma rays, X-rays, Ultra-violet, Visible Light, Infrared, microwaves, radio waves.
As frequency increases wavelength shortens
The photoelectric effect is induced with a wavelength less than 388 nm but no greater wavelength. What is this metals work function?
Hint: How does wavelength relate to Frequency
Hint: How does frequency relate to the Photoelectric effect?
Work function= 3.2 eV
fun fact: to convert from eV to J you use the conversion factor 1eV = 1.602 × 10-19 J
^you don't have to know this conversion for your test
what is the condensed electron configuration for Copper
[Ar]4s13d10
Which element has the largest difference between the third ionization energy and the fourth ionization energy?
A. C
B. Be
C. B
D. F
Boron