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g100num [7]
3 years ago
10

How can so many different substances in the world be made of so few elements?

Chemistry
1 answer:
Mrrafil [7]3 years ago
7 0
Matematically speaking, maybe because:
The number of substances = number of elements + number of different combinations of those elements
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At room temperature (208C) and pressure, the density of air is 1.189 g/L. An object will float in air if its density is less tha
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Total density of filled ball with carbon dioxide gas: \frac{012g+1.0248g}{0.560L} = 2.044g/L

The relationship between mass and volume can be easily determined using density; for example, the mass of a body is equal to its volume multiplied by the density (M = Vd), whereas the volume is equal to the mass divided by the density (V = M/d). The ball filled with carbon dioxide will not float in the air because total density of filled ball is greater than the density of an air. Density of the evacuated ball D = 0.214 g/L

Density of carbon dioxide gas = d_1 = 1.830g/L

Mass of the carbon dioxide gas : 1.830g/L \times 0.560L = 1.0248g

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4 0
1 year ago
Which of the following is an example of a PHYSICAL change?
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Rust on a nail is a chemical change.

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3 0
3 years ago
Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients NH3(g) + O2(g) + CH4(g)
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A scientist adds iodine as an indicator to an unknown substance. What will this indicator reveal about the substance?
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7 0
2 years ago
What’s the correct answer
Fed [463]
The correct answer is: 
_________________________________________________________
    " F  and Br , because they are in the same group" .
_________________________________________________________
Note:
_________________________________________________________
Choice [B]:  "F and Br ; because they are in the same period" ; is incorrect; since  "F" and "Br" are not in the same "period" (that is, "row").
______________________________________________________
Choice [C]:  "Na and Mg; because they are in the same group {"column"} ;  is incorrect; since:  "Na" and "Mg are NOT in the same group {"column"].
_______________________________________________________
Choice [D]:  "Na and Mg" ; because they are in the same period {"row"}; is incorrect.  Note:  "Na" and "Mg" are, in fact,  in the same period {"row"}. However, as aforementioned, {Mg and Na} are not in the same group {"column".}.  

Note:  The similiarities in physical and chemistry properties among elements are determined and organized — or tend to be so—by "groups" {"columns"} — NOT by "periods" {rows}.  
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3 years ago
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