Question

HELP ASAP!! DUE TOMORROW!! FAN & MEDAL!! PLEASE I DON'T UNDERSTAND THIS!!

Lesson 2
3. Here is the balanced chemical equation for making water: 2H2 (g) + O2 (g) o 2H2O (l).
a. What is the predicted yield for water based on this equation?
b. What would you have to do to triple the predicted yield?

4. Find the following for this reaction: MgO + H2O o Mg(OH)2
a. This reaction is carried out with one mole of MgO and three moles of H2O. What is the predicted yield for Mg(OH)2?
b. The percent yield for this reaction is 83.2 percent. What is the actual yield of Mg(OH)2?
c. In the reaction, which compound is the limiting reactant and which is the excess reactant?
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Lesson 3
3. Gold-185 decays to iridium-181. Is this an example of alpha or beta
decay?

9. What is the half-life of each of these radioactive isotopes?
a. A radioactive isotope decreased to one-half its original amount in 18 months.
b. A radioactive isotope decreased to one-fourth its original amount in 100 years.

10. For each scenario below, indicate whether a chemical reaction or a nuclear reaction is occurring.
a. When two compounds are combined heat is released.
b. A sample of galium-68 is reduced to one-half of its original amount in 68.3 minutes.
c. Radium-226 decays to radon-222.
d. A spark of energy is used to begin the combustion of methane gas.
e. Hydrogen nuclei are fused in the Sun to make helium atoms.

Answer 1

@SnuggieLad @zepdrix @freckles @radar @uri @ganeshie8 @aaronq @nincompoop @sleepyjess @AloneS @Photon336

Answer 2

@Gandalf123