3 years ago

Can the components of a solution be separated using heat energy to create phase changes?

Chemistry

1 answer:

zaharov [31]3 years ago

7 0

Answer:yes

Explanation:

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Abigail obtained 36.6 grams of calcium carbonate after performing a reaction. From her calculations, she knew she should have ob

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Answer:

it would be 1

Explanation:

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How is nitric acid classified?

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Alpha particles are helium nuclei. electromagnetic waves. electrons. neutrons.

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Alpha particles are helium nucleus ! so answer is A !

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3 years ago

How many atoms of Lead are in a 62.7 g sample of Lead(II) permanganate?

Alexandra [31]

Answer:

$\large \boxed {8.48 \times 10^{22}\text{ atoms}}$

Explanation:

1 mol of Pb(MnO₄)₂contains 1 mol of Pb atoms.

1. Moles of Pb

$\text{Moles of Pb} = \text{62.7 g Pb(MnO$_{4}$)}_{2} \times \dfrac{\text{1 mol Pb(MnO$_{4}$)}_{2}}{\text{445.07 g Pb(MnO$_{4}$)}_{2}}\\\\\times \dfrac{\text{1 mol Pb}}{\text{1 mol Pb(MnO$_{4}$)}_{2}} = \text{0.1409 mol Pb}$

2. Atoms of Pb

$\text{Atoms of Pb} = \text{0.1409 mol Pb } \times \dfrac{ 6.022 \times 10^{23}\text{ atoms Pb }}{\text{1 mol Pb }}\\\\= \large \boxed {\mathbf{8.48 \times 10^{22}}\textbf{ atoms Pb }}$

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3 years ago

Hydrogen reacts with an element to form a compound. Which element would have the most valence electrons and also be able to reac

pantera1 [17]

Answer:

Chlorine

Explanation:

Hello.

In this case, for the given elements, we are able to know that oxygen has 6 valence electrons, chlorine 7, nitrogen 5 and neon 8, therefore neon is not able to react as it already has 8 valence electrons. Besides, the element having the most valence electrons is chlorine and its reaction with hydrogen forms hydrogen chloride as shown below:

$H_2(g)+Cl_2(g)\rightarrow 2HCl(g)$

Therefore, the required element is chlorine.

Regards.

5 0

3 years ago

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