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Do the molecules of alkanes have strong intermolecular forces and high melting points?
No, molecules of alkanes have weak intermolecular forces (London dispersion forces) due to their simple linear structure with only van der Waals interactions. This results in low melting points for alkanes compared to many other types of compounds.
What pattern appears when going down the list alkanes?
As you move down the list of alkanes, there is a consistent increase in molecular size and weight, leading to higher boiling and melting points. The number of carbon and hydrogen atoms increases, resulting in greater molecular complexity and stronger van der Waals forces. Additionally, the physical state of alkanes transitions from gaseous to liquid and eventually solid as the carbon chain lengthens.
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".
Do the molecules of alkanes have strong intermolecular forces and high melting points?
No, molecules of alkanes have weak intermolecular forces (London dispersion forces) due to their simple linear structure with only van der Waals interactions. This results in low melting points for alkanes compared to many other types of compounds.
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
What pattern appears when going down the list alkanes?
As you move down the list of alkanes, there is a consistent increase in molecular size and weight, leading to higher boiling and melting points. The number of carbon and hydrogen atoms increases, resulting in greater molecular complexity and stronger van der Waals forces. Additionally, the physical state of alkanes transitions from gaseous to liquid and eventually solid as the carbon chain lengthens.
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.
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.
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 is the difference between the melting point of stearic acid and oleic acid?
The melting point of stearic acid is higher than that of oleic acid. This is because stearic acid has a straight chain structure with saturated fatty acids, leading to stronger intermolecular forces and a higher melting point compared to oleic acid, which has a bent or kinked structure with unsaturated fatty acids.
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.
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.
What is a soild changing into a liquid called?
melting
