0
What are Saw-Tooth pattern and Alternation Effect wrt melting points of straight chain alkanes?
Sabya961914
The Saw-Tooth pattern represents the crystal lattice of straight chain alkanes with terminal ends lying in the same side while the alternation effect shows how the melting point from odd to even positions of carbon atoms is higher than from even to odd Carbon atoms.
Wiki User
∙ 9y ago
Add your answer:
Earn +20 pts
Do the molecules of alkanes have strong intermolecular forces and high melting points?
No, alkanes are non polar compounds and have low intermolecular attraction and low melting points.
How do those properties of Alkanes vary as the number of carbon changes?
As the number of carbons increase, each additional CH2 group contributes to a fairly constant increase in the boiling point and density. The melting point is also increased but to a lesser extent.
What is a crystalline solids melting point?
Name this crystalline solid; each compound and material have a different melting point.
When ice changes into water vapor must it melt first?
No - ice can go straight to vapor without first melting. The process is known as "sublimation".
Why is ice core data not used to monitor recent changes of level of carbon dioxide?
Because of the ice caps melting and there are easier ways such as records and taking it straight out of the air.
Do the molecules of alkanes have strong intermolecular forces and high melting points?
No, alkanes are non polar compounds and have low intermolecular attraction and low melting points.
Which has higher boiling point aldehyde or ketone?
the alkanes are saturated and contains more atoms so therefore contain more electrons this results in stronger dispersion forces the alkenes and unsaturated contain less atoms less electrons weaker dispersion force compared to the alkane
Would it be more important to store octane or pentane in a tightly sealed bottle at a low temperature why?
Alkanes are colourless methane to butane are colourless gases(propane and butane are easily condensed under pressure & are commonly sold as liquids)alkanes containing 5 carbons up to about 19 are colourless liquids(petrol & kerosene are mixtures of liquid alkanes, dye is added to the fluids for safety reasons)alkanes with more than about 20 carbon atoms are colourless, waxy solids(paraffin wax is a mixture of solid alkanes)Alkanes are less dense than water (alkanes will float on top of water) density increases with increasing molecular massSimple alkanes have low melting and boiling points. Alkanes are non-polar so only weak intermolecular forces act between the alkane molecules(Van der Waal's Forces/London Forces/Dispersion Forces/Weak Intermolecular Forces)Melting and Boiling Points increase as the molecular mass increasesAlkanes are insoluble in polar solvents like waterAlkanes are relatively unreactive (they will combust: commonly used as fuels since large amounts of energy are released, the longer the chain, the more bonds are broken, the greater the energy released)(will undergo halogenation by substitution reaction in the presence of ultra-violet light)Alkanes with *flashpoints below room temperature (the components of petrol for example) should be stored in strong metal containers with narrow mouths & tightly sealed lids to prevent the vapour from escaping & to prevent a naked flame or spark from igniting the vapour/air mixture.
How do those properties of Alkanes vary as the number of carbon changes?
As the number of carbons increase, each additional CH2 group contributes to a fairly constant increase in the boiling point and density. The melting point is also increased but to a lesser extent.
What is a crystalline solids melting point?
Name this crystalline solid; each compound and material have a different melting point.
When ice changes into water vapor must it melt first?
No - ice can go straight to vapor without first melting. The process is known as "sublimation".
What is the melting point of vinyl for example a vinyl window frame?
The frame of a "Vinyl" window is made out of PVC (Polyvinylchloride). The properties of PVC will depend on the additives and other components added during the compounding step. Straight PVC has a melting point around 85 oC. Higher heat resistant PVC has a melting point around 180 oC.
What do you call the temperature at which a solid changes to a liquid?
This is the melting point.
What is a soild changing into a liquid called?
melting
Why is ice core data not used to monitor recent changes of level of carbon dioxide?
Because of the ice caps melting and there are easier ways such as records and taking it straight out of the air.
Why ice core data is not used to monitor recent changes of level of carbon dioxide?
Because of the ice caps melting and there are easier ways such as records and taking it straight out of the air.
Which term is defined as the temperature at which a substance changes from a solid to a liquid state?
melting point
