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pshichka [43]
2 years ago
7

What does a bi-directional arrow tell you about a chemical reaction?

Chemistry
1 answer:
saul85 [17]2 years ago
5 0
A two-headed arrow is used to show the presence of resonance/mesomerism in a molecular structure. The resonance is the movement of the electrons or the electron delocalization
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B. Cell Type

Explanation:

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If you know the mass of Earth, what other single value would you need to know to calculate Earth's average density?
Dennis_Churaev [7]

Answer:

Volume

Explanation:

Density:

Density is equal to the mass of substance divided by its volume.  In order to find the density of earth when mass is given we have to calculate its volume. The volume of earth is calculated by using the volume formula for sphere. i.e 4/3 π r³. we also require radius to find the volume and we know that

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The diameter of earth equator is 12756.75 Km. So we calculate the radius by dividing the diameter by 2. Then by putting the value of radius in 4/3 π r³ we will get the volume and then we can calculate the density of earth.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

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V=volume

Symbol:

The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.

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Scientists use bacteria to make medicines,<br><br> o True<br> o False
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