Question

HELP ASAP!! DUE TOMORROW!! FAN & MEDAL!! PLEASE I DON'T UNDERSTAND THIS!! I CAN'T AFFORD TO GET AN F!!


Lesson 2
4. Find the following for this reaction: MgO + H2O -> 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
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

@Mehek14 @KendrickLamar2014 @Ashleyisakitty @jabez177 @SnuggieLad @zepdrix @freckles @radar @uri @ganeshie8 @aaronq @nincompoop @sleepyjess @AloneS @Photon336 @Gandalf123

Answer 2

MgO + H2O o Mg(OH)2 what is that "o" between h2o and mg(oh)2?

Answer 3

MgO + H2O -> Mg(OH)2 @wissenwolf

Answer 4

first question seems to be about ratios soz my chems a bit rusty so i dont think i can help :(

Answer 5

Can you help with the lesson 3 questions? @wissenwolf

Answer 6

Alpha decay releases a Helium-4 Nucleus (No electrons) so take 2 from the atomic number and 4 from the atomic mass. This gives you Iridium-181.