Potassium iodide will act as the catalyst to decompose hydrogen peroxide into water and oxygen. A catalyst is a substance that participates in a chemical reaction and influences its speed without undergoing permanent change.<span>
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I believe it is the Lithosphere
840 test tubes will be required in total for all the students for the 6 chemistry classes.
This is a word problem, so we need to deduce the facts;
Each student = 5 test tubes
So, 28 students will need 5 x 28 test tubes = 140 test tubes
140 test tubes are needed for the 28 students for a single chemistry class.
Therefore, for 6 chemistry classes;
Total test tubes = 140 x 6
Total test tubes = 840
For the 6 chemistry classes, a total of 840 test tubes will be needed.
Read more on word problem: brainly.com/question/29797698
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HCN is a Bronsted acid; it can dissociate into H+ and CN-. And H+ is a Lewis acid because it accepts election pairs. ... In order for H+ and CN- to be formed, Hydrogen in HCN donates its electrons to Carbon. So in this sense, Hydrogen is the lewis base and Carbon is the lewis acid.
