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pogonyaev
3 years ago
14

Rank the following compounds in order of increasing heat of combustion. Be sure to answer all parts. Drag each item to the corre

ct box. A) pentane B) propane C) butane
Chemistry
1 answer:
vfiekz [6]3 years ago
7 0

Answer:

The compounds are arranged from the least heat of combustion to the highest (in order of increasing heat of combustion).

Propane--> butane --> pentane.

Explanation:

Hydrocarbons are compounds which contains carbon and hydrogen only. Alkane is called a saturated hydrocarbon because all four bonds of carbon are single bonds. Examples of alkanes include: pentane, propane and butane. One of the chemical properties of alkanes includes combustion reaction.

In COMBUSTION REACTION, alkanes burns in air (oxygen) to produce carbon dioxide and water.The heat released on complete combustion of one mole of a substance is called HEAT OF COMBUSTION.

The heat of combustion of saturated hydrocarbon ( alkanes) increases with increase in number of carbon atoms in a molecule. This is due to more carbon available for burning and more number of bonds undergoing changes. Therefore in the arrangement of the given compounds, PENTANE has the highest heat of combustion while PROPANE is the least.

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The formula for a compound of Li+ ions and Br- ions is written LiBr. Why can’t it be written Li2Br? Why isn’t it written BrLi?
maksim [4K]

Lithium has charge of +1 and bromide has charge of - 1. So they combine to form the compound lithium bromide which is expressed as LiBr.

<h3><u>Explanation:</u></h3>

Lithium is an alkali metal placed in group 1 or periodic table. It has a valency of 1 which is achieved as lithium loses an electron to achieve a charge of +1.

Bromine is a halogen which is placed in group 17 of periodic table. It has a valency of 1 which is achieved as bromine looses an election to achieve a charge of - 1.

Lithium is the cation and bromide is the anion. So lithium is written in front and bromine following the cation. And as both of their valencies are 1, so they form the compound LiBr.

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3 years ago
If a sample has a mass of 245.8 grams and takes up 94ml of space, what is the density of the sample?
allochka39001 [22]

To find the density of any sample, you need to know the Mass (grams), and its Volume (measured in mL or cm³). Divide the mass by the volume in order to get a sample's Density.

 

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<span>P=2.65grams per ml </span>

7 0
3 years ago
Mixing sand and salt is it a chemical or physical change​
defon

Answer:

Mixing of salt is physical change.

Explanation:

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Physical Change:                                                                                              

The changes that occur only due to change in shape or form but their chemical or internal composition remain unchanged.

These changes were reversible.

They have same chemical property.

These changes can be observed with naked eye.

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The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

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These may not be observed with naked eye

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Ionic bonds form between nonmetals and metals.

The reason ionic bonds are formed is because nonmetals and metals usually have high electronegativities, which essentially means that metals pull on nonmetals' electrons.
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-T.B.
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Answer:

x² = mutiphy by them self

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