Chemistry, 22.10.2020 08:01 lovelyb32p1waxd
8. Which is an example of a chemical change?
(1 Point)
a:dry ice sublimating
b:sugar dissolving in water
c:penny tarnishing
d:mixing popcorn and pretzels
help pls
Answers: 2
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The rules of engagement (roe) working group is often used to (select all that apply.)
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If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution
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Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.
Answers: 2
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These questions are based on the attached photo. the experiment is about burning magnesium metal with oxygen. 1. write the balanced chemical equation for the reaction you are performing. 2. calculate the mass of magnesium metal used in each trial. o trial 1: o trial 2: 3. calculate the actual yield of magnesium oxide for each trial. o trial 1: o trial 2: 4. magnesium is the limiting reactant in this experiment. calculate the theoretical yield of mgo for each trial. o trial 1: o trial 2: 5. determine the percent yield of mgo for your experiment for each trial. o trial 1: o trial 2: 6. determine the average percent yield of mgo for the two trials. your company currently uses a process with a similar cost of materials that has an average percent yield of 91 percent. if the average percent yield of this process is higher than that, this could save the company money. what is your recommendation to the company? support your recommendation using your data, calculations, and understanding of stoichiometry gathered from this lab.
Answers: 1
8. Which is an example of a chemical change?
(1 Point)
a:dry ice sublimating
b:sugar di...
a:dry ice sublimating
b:sugar di...
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