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3 years ago

PLEASE HELP!!! I will mark Brainliest!!! How could you know if two substances were the same based upon 2 chemical reactions?

Chemistry

2 answers:

vladimir1956 [14]3 years ago

8 0

Answer:

Observing what the substance looks (color, size, texture) or smells like (odor). Objects can be made up of the same substance, but they differ in the properties of size, mass, and volume.

Explanation:

The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories. Some reactions will fit into more than one category.

Novay_Z [31]3 years ago

5 0

Answer:

1.Color Change.

2.Production of an odor.

3.Change of Temperature.

4.Evolution of a gas (formation of bubbles)

5.Precipitate (formation of a solid)

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3 years ago

Rank the following solutions in order of increasing acidity (least acidic to most acidic): I: [H3O+] = 1x10−5 II: [OH−] = 1x10−1

kozerog [31]

Answer: option C) II < III < I

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For I

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So pH3O = -log (H3O+)

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pOH = - log(OH-)

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= 9

For III

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Use bond energies to calculate the enthalpy of reaction for the combustion of ethane. Average bond energies in kJ/mol C-C 347, C

ivanzaharov [21]

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The reaction is:

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The enthalpy of reaction (1) is given by:

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