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3 years ago

What is this material

Chemistry

1 answer:

faltersainse [42]3 years ago

3 0

Answer:

rocks

Explanation:

rocks are solid in nature and it contains essential nutrients but can break down by the process called weathering

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Arrange the three common unit cells in order from least dense to most dense packing. a. face-centered cubic < body-centered c

maks197457 [2]

Answer:

b. primitive cubic < body-centered cubic < face-centered cubic

Explanation:

The coordination number is defined as the number of atoms (or ions) surrounding an atom (or ion) in a crystal lattice. Its value gives us a measure of how tightly the spheres are packed together. The larger the coordination number, the closer the spheres are to each other.

In the primitive cubic, each sphere is in contact with 6 spheres, so its coordination number is 6.

In the body-centered cubic, each sphere is in contact with 8 spheres, so its coordination number is 12.

In the face-centered cubic, each sphere is in contact with 12 spheres, so its coordination number is 12.

Therefore, the increasing order in density is the primitive cubic first, then the body-centered cubic, and finally the face-centered cubic.

3 0

3 years ago

The normal range of the pH of blood is between 7.35 and 7.45; variations beyond this range have significant health implications.

patriot [66]

Answer:

The hydrogen ion concentrations associated with these pH value 7.35 is $4.5\times 10^{-8} M$

The hydrogen ion concentrations associated with these pH value 7.45 is $3.6\times 10^{-8} M$ .

Explanation:

To calculate the pH of the solution, we use the equation:

$pH=-\log[H^+]$

We are given:

1) pH = 7.35

Putting values in above equation, we get:

$7.35=-\log[H^+]$

$[H^+]=4.467\times 10^{-8} M\approx 4.5\times 10^{-8} M$

The hydrogen ion concentrations associated with these pH value 7.35 is $4.5\times 10^{-8} M$

2) pH = 7.45

Putting values in above equation, we get:

$7.45=-\log[H^+]$

$[H^+]=3.548\times 10^{-8}M \approx 3.6\times 10^{-8} M$

The hydrogen ion concentrations associated with these pH value 7.45 is $3.6\times 10^{-8} M$ .

8 0

3 years ago

When the following equation is balanced, what is the coefficient of oxygen?

Gwar [14]

Answer:

The answer is 3

C2H5OH + O2 CO2 +H2O (unbalanced)

C2H5OH +3O2(g). 2CO2(g)+3H2O(balanced)

4 0

3 years ago

Compare to the sample of helium at STP, the same sample of helium at a higher temperature and a lower pressure.

Molodets [167]

Here we have to compare the state of helium gas at STP and high temperature and low pressure.

At STP (standard condition of temperature and pressure) i.e. 273K temperature and 1 bar pressure. At STP helium gas will behave as a real gas.

At higher temperature and low pressure Helium will behave as an ideal gas.

The ideal gas conditions are developed on taking into account two factors: (i) the gas molecules are point of mass and having no volume. (ii) there is no existence of force of attraction between the molecules.

The deviation from ideal gas to the real gas depends upon the van der waals' interaction between the gas molecules. Now in low pressure and high temperature, we can ignore the volume and also the inter-molecular force of attraction. Thus the gas sample can behaved as ideal gas.

But at elevated pressure and low temperature i.e. STP the assumptions are not valid and it will behave as real gas.

4 0

3 years ago

A bond where the electrons are shared equally is called a(an) ________ bond.

zubka84 [21]

Metallic bonds result when electrons are shared equally.

7 0

4 years ago