Lights, Waves, temperature, and density.
A red laser pointer emits light with a wavelength of 6.50 × 10⁻⁷ m. Given that the speed of light is 3.00 × 10⁸ m/s, what is the frequency of the light in Hz (or s⁻¹)?
4.61x10^14 Hertz.
Identify the s,p,d shaped orbitals I put up on the whiteboard.
Pointed out by the student.
Are the following heterogenous or homogenous mixtures?
A mixture of sand and milk? A mixture of sugar and tea?
1) Heterogenous
2) Homogenous
How many electrons are in an Oxygen atom that has a charge of -2? Oxygens atomic number is 8.
10.
If an element has an average Atomic mass of 89.8 amu, and one isotope that has a mass of 90.2 amu, and an abundance of 60% naturally. What is the mass of the second (and only other) isotope from this element?
89.2 amu
A scientist remarks wow! Its 50 °C, what is this temperature in Kelvin?
323.15 K
Which of the following are impossible?
(1s, 3p, 2s, 2d)?
Would NaCl be considered an Element, Compound or Mixture? Can you give an example of two things that satisfy the other categories definition?
A compound.
Using the information from above, how many neutrons are there in an oxygen atom that weighs 18 AMU?
10.
An electron (mass = 9.11 × 10⁻³¹ kg) travels at a speed of 1.50 × 10⁴ m/s. Using Planck's constant (h = 6.626 × 10⁻³⁴ J·s), calculate its de Broglie wavelength in nanometers.
48.4 nm
Radio waves have a very long wavelength (3 × 10¹¹ nm) or (300 m). State whether their frequency is high or low and explain how that frequency affects the energy of the wave.
Very low Frequency, because wavelength is long. Lower frequency= lower energy.
What type of orbital do the following Quantum numbers refer to?
(n=3, l=2, m=-2, ms= +1/2).
3d
State what differs between each of the following, (elements, compounds, mixtures) here is a hint, the three words you will want to use to fill in the blanks are, Protons, Electrons, Neutrons.
Elements: Protons.
Ions: Electrons.
Neutrons: Isotopes.
Calculate the Moles of Tin, if you have a sample of the metal weighing 156.8 g?
1.32 Moles.
Isotope A has a mass of 34.97 amu and a percent abundance of 75.0%.
Isotope B has a mass of 36.97 amu and a percent abundance of 25.0%.
What is the Atomic mass of the element composed of these two Isotopes?
35.47 amu
What is the volume (in cm^3) of a 27.4-gram sample of marble, with a density of 2.8 g/cm³?
9.78 cm^3
How many total nodes are in a 3p orbital?
2
Which two of these four are ISOTOPES of each other?
(Image I will put up on board)
Option A, and option B.
How many grams is 3.2 moles of sodium?
73.56 g
If an electron is completely ejected, and the single hydrogen electron leaves, meaning hydrogen is ionized. If Ionization happens from the excited 3rd quantum level, what energy photon was absorbed?
2.42 x 10^-19 J.
A green laser pointer emits light with a frequency of 5.65 × 10¹⁴ Hz. Given that c = 3.00 × 10⁸ m/s, what is the wavelength of the light in nanometers (nm)?
531 nm.
Which one (or more) of the following are unreasonable? And why?
Option A: (n=3, l=2, m=-2, ms= +1/2)
Option B: (n=2, l=1, m=2, ms= -1/2)
Option C: (n=1, l=0, m=0, ms= +1/2)
Option D: (n=4, l=3, m=-1, ms= -1/2)
B, M is greater than positive l.
Which of the following contain the most particles?
10 g of Li, 10 g of C or 10 g of O?
10 g of lithium, is the element with the smallest molar mass, meaning this sample has the most moles, moles are directly related to particles through avogadro's number.
Calculate how many particles are present in a 50 g sample of potassium.
7.65x10^23 particles.
When an electron in an atom of hydrogen relaxes from the 4th quantum level to the 1st, what is the wavelength of the emitted light? In nanometers.
97.4 nm