CHM130 Lesson 12 AYL
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Calculate the mass percent of a solution containing 45.6 grams ethanol (C2H6O) in 245 grams of water. | 15.7
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| You are asked to make 500.0 mL of a 4.5M solution of HCl, but the only HCl you have available to dilute is 18.0M. Describe how you would make the desired solution. | You are asked to make 500.0 mL of a 4.5M solution of HCl, but the only HCl you have available to dilute is 18.0M. Describe how you would make the desired solution.
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| Explain the difference between a strong electrolyte and a non-electrolyte solution. What kinds of solutes make each type of solution? | Most of the solute doesnot dissociate in a weak electrolyte whereas in a strong electrolyte a higher ratio of solute dissociates to form free ions. Some examples of strong and weak electrolytes are as follows:
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| A 255-mL sample of HCl solution reacts with excess Mg to produce 14.0 L H2 gas at STP. What is the molarity of the HCl solution? Mg(s) + 2HCl(aq) ® MgCl2(aq) + H2(g) | Molarity = moles / Litres of solution
Volune HCl = 255 ml = 0.255 L
Molarity HCl = 1.25 mol / 0.255 L
= 4.90 M HCl
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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