A boy sets up a picnic on the beach next to a sand dune. how are sand dunes formed?

Chemistry

1 answer:

jasenka [17]2 years ago

5 0

Answer:

Sand dunes are created when wind deposits sand on top of each other until a small mound starts to form. Once that first mound forms, sand piles up on the windward side more and more until the edge of the dune collapses under its own weight.

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Place these hydrocarbons in order of decreasing boiling point. Compound Structure butane CH3CH2CH2CH3 pentane CH3CH2CH2CH2CH3 2,

Svetllana [295]

Answer:

Order of hydrocarbons in decreasing order of boiling point:

Paraffin > Hexadecane > Pentane > Dimethylpropane > Butane

Explanation:

Boiling points of hydrocarbons depend upon:

Mass of the hydrocarbon

Intermolecular forces of interaction

Hydrocarbons of greater mass or greater number of carbons have greater molecular mass.

Molecular formula of paraffin is $CH_3(CH2)_{33}CH3$

Molecular formula of hexadecane is $CH_3(CH2)_{14}CH3$

Among given hydrocarbons, number of carbon is highest in paraffin and hence has highest boiling point.

Boiling point of paraffin is followed by hexadecane having second highest number of carbon.

Mass of dimethylpropane and pentane are comparable. But boiling point of dimethylpropane is less than pentane. This is because branching decreases intermolecular force of attraction (van der Waal's force) which leads to decrease in boiling point.

No. of carbon in butane is least among given. So its boiling point is lowest.

Hence, Order of hydrocarbons in decreasing order of boiling point:

Paraffin > Hexadecane > Pentane > Dimethylpropane > Butane

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2 years ago

What happens to the buoyant force on an object as it is lowered into water?

PSYCHO15rus [73]

The buoyant force is the upward force or thrust...Simply, consider immersing your hand into a bucket of water. What happens to it? It raises (a little). The raising is due to the buoyant force. Basically it is the upward force/thrust that acts on any object immersed into a fluid. Hence why things float when out in water. Hope this helped!!

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2 years ago

Calculate the Ka for the following acid. Determine if it is a strong or weak acid. HClO2(aq) dissolves in aqueous solution to fo

Talja [164]

Answer:

The value of Ka $= 1.1*10^{-2}$