Moles of a substance 2

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Jamie Antoun

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Christian Lawson-Perfect

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7 years, 1 month ago

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Christian Lawson-Perfect 7 years, 1 month ago

Gave some feedback: Ready to use

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Christian Lawson-Perfect 7 years, 1 month ago

Published this.

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Jamie Antoun 10 years, 10 months ago

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Question statement

Answer the following questions. Please enter your answers as decimals, not as fractions. Give your answers to 2 decimal places.

If you would like to see how to do this question, click on 'Reveal answers' at the bottom of the page.

Give any introductory information the student needs.

			Name	Type	Generated Value

a	integer	4
NaCl	number	58.44
b	integer	28
glucose	number	180.16

Automatically regenerate variables?

Name

Data type

Value

xxxxxxxxxx
 
random(4..20)

JME function reference

Description

Describe what this variable represents, and list any assumptions made about its value.

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Generated value: `integer`

This variable doesn't seem to be used anywhere.

Parts

Part a) Gap-fill
1. Gap Number entry
  Add
Part b) Gap-fill
1. Gap Number entry
  Add

Gap-fill

Ask the student a question, and give any hints about how they should answer this part.

Glucose has a molecular weight of $\var{glucose}$ . How many moles of glucose are there in $\var{5 * a}$ grams?

Unnamed gap moles

Advice

To answer these questions we use the formula

$\dfrac{\text{mass of substance (in grams)}}{\text{molecular weight}} = \text{number of moles}$ .

Glucose has a molecular weight of $\var{glucose}$ . How many moles of glucose are there in $\var{5 * a}$ grams?

Solution:

Putting our numbers into the formula we find that there are

$\begin{align} \dfrac{\var{5 * a}}{\var{glucose}} &= \var{(5 * a) / glucose} \text{ moles}\\ &= \var{precround(((5 * a) / glucose), 2)} \text{ moles to 2 d.p.} \end{align}$

in $\var{5 * a}$ grams of glucose.

Sodium chloride has a molecular weight of $\var{NaCl}$ . How many moles of sodium chloride are there in $\var{5 * b}$ grams?

Solution:

Putting our numbers into the formula we find that there are

$\begin{align}\dfrac{\var{5 * b}}{\var{NaCl}} &= \var{(5 * b) / NaCl} \text{ moles} \\ & = \var{precround(((5 * b) / NaCl), 2)} \text{ moles to 2 d.p.} \end{align}$ .

in $\var{5 * b}$ grams of sodium chloride.

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Part	Test	Passed?
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Number entry
Number entry		Hasn't run yet
Gap-fill
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Number entry
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This question is used in the following exams:

Moles by Jamie Antoun in Jamie's workspace.
Molar Calculations by Jamie Antoun in Jamie's workspace.

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Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

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Checkpoint description

Christian Lawson-Perfect 7 years, 1 month ago

Christian Lawson-Perfect 7 years, 1 month ago

Jamie Antoun 10 years, 10 months ago

Error in variable testing condition

Error

Warning

Generated value: `integer`

Parts

Gap-fill

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Moles of a substance 2

Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

Feedback

History

Comment

Checkpoint description

Christian Lawson-Perfect 7 years, 1 month ago

Christian Lawson-Perfect 7 years, 1 month ago

Jamie Antoun 10 years, 10 months ago

Error in variable testing condition

Error

Warning

Generated value: integer

Parts

Gap-fill

Generated value: `integer`