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-BARSIC- [3]
4 years ago
8

Match these items with their examples.

Chemistry
2 answers:
kiruha [24]4 years ago
7 0
Here you go! Feel free to ask questions!

Alexus [3.1K]4 years ago
7 0

Answer:

1. liquid solution: soda  

2. solid solution: Steel

3. compound: Salt

4. colloid: milk  

5. element: aluminum foil  

Explanation:

1. Soda is a mixture of water, carbon dioxide gas, and solid sugar. Sugar is dissolved in water, and carbon dioxide is dissolved in water under pressure

2. Alloys, like steel, are solid solutions made up of one metal and one or more metal or non-metal elements.

3. Salt is an ionic compound composed by sodium and chlorine.

4. In a colloid  large molecules or ultramicroscopic particles of one substance are dispersed through a second substance; at first sight they are confused with solutions because dispersed molecules are not evident . Milk is a mixture of liquid fat-globules dispersed and suspended in water

5. Aluminum foil  is olly composed by one element, aluminium

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A

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The element boron exists in nature as two isotopes: 10B has a mass of 10.0129 u, and 11B has a mass of 11.0093 u. The average at
Shalnov [3]

Answer:

Percentage abundance of B 10 is = 20 %

Percentage abundance of B 11 is = 80 %

Explanation:

The formula for the calculation of the average atomic mass is:

Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})

Given that:

Since the element has only 2 isotopes, so the let the percentage of first be x and the second is 100 -x.

For first isotope, B 10:

% = x %

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For second isotope, B 11:

% = 100  - x  

Mass = 11.0093 u

Given, Average Mass = 10.81 u

Thus,  

10.81=\frac{x}{100}\times {10.0129}+\frac{100-x}{100}\times {11.0093}

10.0129x+11.0093\left(100-x\right)=1081

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Percentage abundance of B 11 is = 100 - 20 %  = 80 %

8 0
3 years ago
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Which statement describes a difference between the lower mantle and oceanic crust?
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Answer:

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Explanation:

The lower mantle is under the surface of the earth while the ocieanic crust is above the surface

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the element chlorine is a gas. it's formula is cl2 . how many different masses of the cl2 molecule would you expect to find in a
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Answer:

the answer is 3.33⋅1023 molecules of Cl2. Note that 6.022⋅1023 is also known as Avogadro's number, and it can be referred to as the number of molecules in one mole of that substance. Also, I calculated 70.9 because 35.45 g/mol (the mass of one Chlorine atom) times 2 is 70.9 g/mol (Cl2 has two Chlorine atoms).

Explanation:

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3 years ago
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