"High School Chemistry Review"
86.5 g NaCl were put in 720 mL of water. Find the molarity of the solution.
What is 2.1 M NaCl?
Write the symbols for Alpha Particles, Beta Particles, Positrons, and Neutrons.
What are:
Alpha, 42He
Beta, 0-1B
Positron, 01B
Neutron, 10n
The number of half-lives that have passed when 75% of the radioactive material has decayed.
What are 2 half-lives?
The change in energy and wavelength as frequency increases.
What is energy increases and wavelength decreases with increasing frequency?
Identify one difference between chemical and nuclear reactions.
What are:
- Identity of elements can change in nuclear reactions
- Mass Conservation does not hold for nuclear reactions
- Electrons are the primary participants of chemical reactions
Balance the Reaction
C2H6 + O2 --> H2O + CO2
What is 2C2H6 + 7O2 --> 6H2O + 4CO2?
Radium-230 (Ra) Undergoes Alpha Decay. Find the resultant nuclide.
What is Radon-226?
The half-life is 15 years for a radioactive substance. Initially, there were 89.7 g and now there are 18.3 g. Find how much time has passed.
What is 34.4 years?
A photon is emitted when electron goes from __ to __ energy level.
What are high to low?
Compare an orbit (Bohr Model) to an orbital (Quantum Model).
What are a fixed, quantized radius where an electron is (orbit) vs. the likely region an electron can be in based on its quantum numbers?
Usain Bolt ran the 100m in 9.58 seconds. Find his average speed in km/h.
What is 37.6 km/h?
The effect that Beta Decay and Electron Capture have on a nuclide.
What are neutron becomes a proton (beta) and proton becomes a neutron (electron capture)?
The factor that affects the rate of decay for a nuclear decay process.
What is the amount of the substance?
The 2 sets of quantum numbers that define the electrons in a full 3s subshell.
What are n = 3, l = 0, ml = 0, ms = +/-0.5
Find mass defect of Krypton-82.
Mass of Kr-82: 81.913481 amu
Mass of Proton: 1.007825 amu
Mass of Neutron: 1.008665 amu
What is 0.766809 amu?
Number of molecules of H2O in 57.3 mg of H2O.
What are 1.91 * 1021 molecules of water?
Balance the Nuclear Reaction:
23592U + 10n --> 510n + 9139Y + ____
What is
23592U + 10n --> 510n + 9139Y + 14053I?
Initially, 100% of a brick was radioactive. Its half-life is 7.5 hrs. After 1 day, this much of the brick is still radioactive.
What is 10.9% of the brick?
Find wavelength of photon when electron jumps from n = 5 to n = 2.
What is 434 nm?
Find Nuclear Binding Energy per nucleon of Iron-56.
Mass of Fe-56: 55.934936 amu
Mass of Proton: 1.007825 amu
Mass of Neutron: 1.008665 amu
What is 8.79 MeV?
H2O + CO2 --> H2CO3
Given 251 g of water and 487 g of carbon dioxide, find grams of H2CO3 produced.
What is 689 grams of H2CO3?
Type of decay that is likely for Magnesium-20?
What is electron capture / positron emission?
Initially, 100% of the atoms in a rock are radioactive. Now, after 18000 years, for every 2 radioactive atoms, there are 7 stable atoms. Find half-life of the rock.
What is 8300 years?
Number of unique electrons that can have n = 2.
What are 8 electrons?
Use Sig Fig Rules: 2.34 * (3.981 + 7.5)
What is 26.9?