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maw [93]
3 years ago
11

Chemical bonds

Chemistry
2 answers:
aniked [119]3 years ago
4 0
Chemical bonds hold atoms together to form compounds through the sharing of electrons or the transferring of electrons. 
Bio is not my strongest subject, but I am pretty sure that a pyramid of numbers differs from an ecological pyramid because it displays the number of organisms at each trophic level
Orlov [11]3 years ago
3 0

D. displays the number of organisms at each trophic level.

Hope I was helpful :)

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Which of the following represents a chemical change?
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What is the name of the functional group in this compound?
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The indicator methyl red has different molecular structures at high and low pH.
Novosadov [1.4K]

Answer:

a. True

Explanation:

Methyl red is an indicator widely used in quality control of oxides as Zinc oxide in the titration with sulfuric acid.

As is used in titrations of acid-base reactions the indicator change in colour. Is red when the pH < 4.4 (Acidic Solutions) and is yellow when pH > 6.2 (Neutral-Basic solutions).

A change in colour means the structure of the indicator is changing with pH. Thus, the answer is:

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6 0
3 years ago
How many grams are in 23.0 moles of carbon (C)?
Gnesinka [82]
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3 years ago
The vapor pressure of a substance is measured over a range of temperatures. A plot of the natural log of the vapor pressure vers
Gala2k [10]

Answer:

28.7664 kJ /mol

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\ln P = \dfrac{-\Delta{H_{vap}}}{RT} + c

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R is the gas constant (8.314×10⁻³ kJ /mol K)

c is the constant.

The graph of ln P and 1/T gives a slope of - ΔHvap/ R and intercept of c.

Given :

Slope = -3.46×10³ K

So,

- ΔHvap/ R = -3.46×10³ K

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<u></u>

6 0
3 years ago
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