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Sidana [21]
3 years ago
12

How is a pure substance different from a mixture?

Chemistry
2 answers:
Sauron [17]3 years ago
7 0
The answer is A.
Pure substance is either an element or a compound, which elements in compund is chemically combined together. They cannot be separated by physical methods such as filtration or evaporation. Compounds can only be separated by chemical methods, which include using electricity (electrolysis) or applying heat.
Alexandra [31]3 years ago
4 0

the real answer is the




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Give the nuclear symbol for the isotope of potassium for which a=40?
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<span>nuclear symbol consists of three parts: 1. the symbol of the element; 2. the atomic number of the element;3. the mass of the element. for the above problem, the symbol for potassium is k. it's atomic number is 40. the number of protons is 19. so we denote this in the following nuclear symbol; 40 k 19</span>

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Which of the following is NOT a characteristic of minerals
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Answer:

A. Occur in gaseous and liquid state

Explanation:

The choice that is not a characteristic of minerals is that minerals occur in gaseous and liquid state.

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Ilia_Sergeevich [38]

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Explanation:

?

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Calculate the energy required to produce 7.00 mol Cl2O7 on the basis of the following balanced equation. 2Cl2(g) + 7O2(g) + 130
KatRina [158]

Explanation:

As the given chemical reaction equation is as follows.

      2Cl_{2}(g) + 7O_{2}(g) + 130 kcal \rightarrow 2Cl_{2}O_{7}(g)

Also, it is given that for 2 moles the energy required is 130 kcal. This means that energy required for 1 mole is calculated as follows.

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Hence, energy required for 7 moles will be calculated as follows.

              Energy required = 7 \times 65 kcal

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Thus, we can conclude that energy required to produce 7.00 mol Cl_{2}O_{7} on the basis of given reaction is 455 kcal.

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nadezda [96]

Answer:

alpha decay

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