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3 years ago

During which era did the supercontinent Pangaea break up?

Chemistry

2 answers:

Rudiy273 years ago

7 0

It broke up in the Mesozoic era.

klemol [59]3 years ago

5 0

It broke up during the Paleozoic era

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Describe 3 ways abrasion occurs in nature

kumpel [21]

There are three ways of abrasion occurs in nature; the wind, waves, and gravity. Abrasion is the mechanical process of wearing away of a rock surface and the movement of the particles while transporting through the wind, waves, and gravity.

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3 years ago

What is the composition, in atom percent, of an alloy that consists of a) 5.5 wt% Pb and b) 94.5 wt% of Sn? Assume that the atom

Anastaziya [24]

Answer : The percent composition of Pb and Sn in atom is, 3.21 % and 96.8 % respectively.

Explanation :

First we have to calculate the number of atoms in 5.5 wt% Pb and 94.5 wt% of Sn.

As, 207.2 g of lead contains $6.022\times 10^{23}$ atoms

So, 5.5 g of lead contains $\frac{5.5}{207.2}\times 6.022\times 10^{23}=1.59\times 10^{22}$ atoms

and,

As, 118.71 g of lead contains $6.022\times 10^{23}$ atoms

So, 94.5 g of lead contains $\frac{94.5}{118.71}\times 6.022\times 10^{23}=4.79\times 10^{23}$ atoms

Now we have to calculate the percent composition of Pb and Sn in atom.

$\% \text{Composition of Pb}=\frac{\text{Atoms of Pb}}{\text{Atoms of Pb}+\text{Atoms of Sn}}\times 100$

$\% \text{Composition of Pb}=\frac{1.59\times 10^{22}}{(1.59\times 10^{22})+(4.79\times 10^{23})}\times 100=3.21\%$

and,

$\% \text{Composition of Sn}=\frac{\text{Atoms of Sn}}{\text{Atoms of Pb}+\text{Atoms of Sn}}\times 100$

$\% \text{Composition of Sn}=\frac{4.79\times 10^{23}}{(1.59\times 10^{22})+(4.79\times 10^{23})}\times 100=96.8\%$

Thus, the percent composition of Pb and Sn in atom is, 3.21 % and 96.8 % respectively.

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3 years ago

Three of Louis Pasteur discovery

konstantin123 [22]

Pasteurization, vaccines against antrax and rabies, discovered the germ fermentation

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3 years ago

Select the supplements that are minerals.

Jet001 [13]

<h3> The supplements that are minerals are</h3>

calcium
sodium
iron
zinc

<u><em> Explanation</em></u>

calcium and sodium are major minerals which are required by the body for

calcium- needed for muscle,hearing bone and for the support of synthesis and function of cells

sodium- is needed to control blood pressure and also for proper muscle and nerve function

Zinc and iron are required in trace and both are needed for good health

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3 years ago

The concentration of a solution can be expressed in

puteri [66]

The concentration of a solution can be expressed in (4) <span>moles per liter~</span>

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3 years ago

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