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3 years ago

Why is carbon is considered tetravalent?

1 answer:

6 0

Carbon has four valence electrons. Meaning, it has 4 electrons in it's last shell. These 4 electrons will form a covalent bond with other elements to get the full set of 8 electrons needed for it to be stable. That is why it's considered as tetravalent.

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Name two fluid technologies that make use of air.

MariettaO [177]

Answer: an air compressor and desk chair.

Explanation:

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3 years ago

27. The density of nickel is 8.91 g/cm3. How large a cube, in cm3, would contain 2.00 x 10^24 atoms of nickel? Use dimensional a

jok3333 [9.3K]

Answer : The volume of the cube is, $21.88cm^3$

Solution : Given,

Density of nickel = $8.91g/cm^3$

Number of nickel atoms = $2\times 10^{24}$

Molar mass of nickel = 58.7 g/mole

First we have to calculate the moles of nickel.

As, $6.022\times 10^{23}$ atoms form 1 mole of nickel

So, $2\times 10^{24}$ atoms form $\frac{2\times 10^{24}}{6.022\times 10^{23}}=3.321$ moles of nickel

The moles of nickel = 3.321 moles

Now we have to calculate the mass of nickel.

$\text{ Mass of Ni}=\text{ Moles of Ni}\times \text{ Molar mass of Ni}$

$\text{ Mass of Ni}=(3.321moles)\times (58.7g/mole)=194.94g$

The mass of nickel = 194.94 g

Now we have to calculate the volume of nickel.

$Density=\frac{Mass}{Volume}$

$8.91g/cm^3=\frac{194.94g}{Volume}$

$Volume=21.88cm^3$

Therefore, the volume of the cube is, $21.88cm^3$

4 0

3 years ago

Even though the same amount of energy was transferred into both substances from the air, the isopropanol evaporated while the wa

Nesterboy [21]

Answer:

The isopropanol evaporated while the water did not because the molecules don't stick together as strongly as the molecules in the water do. The water would need more energy transferred in, in order to evaporate.

Explanation:

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3 years ago

What's the preview of the scientific method

Dafna11 [192]

Explanation:

overall preview would be an expirement is an empirical procedure that arbitrates competing models or hypothesis ☺️

5 0

4 years ago

What do two or more atoms form when they share electrons in a chemical bond

dlinn [17]

A covalent bond is your answer