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Good job. The pass mark is 70%. If you got at least 3 out of 4 questions perfectly, then you have passed!
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Question 1 of 4
1. Question
Welcome to quiz. You need to get at least 3 out of 4 questions perfectly correct to pass the quiz. Simply enter the option letter into the blank.
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Watch the following video and use it to answer the questions that follow.
When measuring out an acid or base with a 25ml pipette, the [ a) top || b) bottom || c) middle ] of the meniscus should touch the line.The figure shows a simple titration setup.
The long glass tube is called a [ a) pipette || b) dropper || c) burette ]
The flask is called a/an [ a) Erlenmeyer flask || b) volumetric flask || c) beaker ]
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Question 2 of 4
2. Question
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During a titration procedure, your first run is a test run to get a general sense of the equivalence point. You should [ a) use || b) not use ] this run when calculating the average titre volume.
After the test run, you should have about [ a) one || b) three || c) fifteen ] more good trials, and find the average across these trials.
When bromothymol blue is used as an indicator, it is added to the [ a) acid || b) base ]. The base is placed in an Erlenmeyer flask while the acid is added to the [ a) pipette || b) burette ]
With bromothymol blue, when the equivalence point of the titration is reached when the solution turns [ a) green/yellow || b) dark blue || c) colorless/transparent ]
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Question 3 of 4
3. Question
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Which of the following correctly states the formula connecting molar mass, number of moles and measured mass?
[ a) number of moles = molar mass/ mass || b) mass * number of moles = molar mass || c) mass = molar mass/ number of moles || d) number of moles = mass/molar mass ]
Which of the following correctly states the formula connecting concentration (mol/dm3), volume (dm3) and number of moles?
[ a) concentration = number of moles * volume || b) number of moles = concentration * volume || c) number of moles = concentration/ volume || d) volume = concentration/number of moles]
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Question 4 of 4
4. Question
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A neutralization reaction is carried out between sodium hydroxide and sulfuric acid as shown below.
2NaOH(s) + H2SO4(aq) ⟶ Na2SO4(aq) + H2O(l)
If 20 moles of sulfuric acid were used up, how many moles of sodium hydroxide were used up.
Answer: (enter a whole number)
A neutralization reaction is carried out between calcium hydroxide and sulfuric acid as shown below.
Ca(OH)2(s) + H2SO4(aq) ⟶ CaSO4(aq) + 2H2O(l)
If 20 moles of sulfuric acid were used up, how many moles of calcium hydroxide were used up.
Answer: (enter a whole number)
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