'n Groep leerders het 'n ondersoek gedoen om die verhouding tussen die kookpunte en die kettinglengtes van drie alkanes te vind - NSC Technical Sciences - Question 3 - 2022 - Paper 2
Question 3
'n Groep leerders het 'n ondersoek gedoen om die verhouding tussen die kookpunte en die kettinglengtes van drie alkanes te vind. Die resultate van die ondersoek word... show full transcript
Worked Solution & Example Answer:'n Groep leerders het 'n ondersoek gedoen om die verhouding tussen die kookpunte en die kettinglengtes van drie alkanes te vind - NSC Technical Sciences - Question 3 - 2022 - Paper 2
Step 1
3.1.1 Ondersoekende vraag
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Answer
The research question is: What is the relationship between chain length/molecular mass/surface area and boiling point in alkanes?
Step 2
3.1.2 Onafhanklike veranderlike
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Answer
The independent variable is the chain length or molecular mass of the alkanes.
Step 3
3.1.3 Afhanklike veranderlike
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Answer
The dependent variable is the boiling point of the alkanes.
Step 4
3.1.4 Gekontroleerde veranderlike
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Answer
The controlled variables include the pressure under which the boiling points are measured and the type of alkane.
Step 5
3.2.1 Skryf die NAAM neer van die intermolekulêre kragte, hoe hoër die kookpunt.
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The name of the intermolecular forces is Van der Waals forces (London dispersion forces).
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Answer
The statement is REG (TRUE). The chain length/molecular mass/surface area decreases from compound C (butane) to compound A (ethane).
Step 7
3.2.3 Pas negatiewe nasies vanaf VRAAG 3.2.2 toe.
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Answer
If the student's reasoning aligns with the observation that the chain length decreases and thus the boiling point decreases, they should not receive negative marking. However, if they identify the opposite trend inaccurately, negative marking is applicable.
Step 8
3.2.4 Kookpunt beïnvloed die kettinglengte/molekulêre massa/oppervlaktearea.
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Answer
Boiling point is influenced by chain length/molecular mass/surface area. An increase in molecular mass generally leads to higher boiling points due to stronger intermolecular forces.
