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3 years ago

What is the purpose of researching elements on the periodic table?

1 answer:

7 0

he number of protons give elements their unique chemical properties, and define their electron energy levels. All three of these elements are naturally occurring, and act chemically like hydrogen because they each have one proton. The different number of neutrons gives them all greatly different atomic mass.

question answered by (jacemorris04)

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The mass of 100cm3 of water is 100 g. Use the formula to calculate its density.

yanalaym [24]

Answer:

It should be 1 g/cm3. Hope this helpd!

4 0

3 years ago

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) Given the following balanced equation, determine the rate of reaction with respect to [O2]. If the rate of formation of O2is 7

Travka [436]

Answer:

Rate of the reaction is 0.2593 M/s

-0.5186 M/s is the rate of the loss of ozone.

Explanation:

The rate of the reaction is defined as change in any one of the concentration of reactant or product per unit time.

$2O_3\rightleftharpoons 3O_2$

Rate of formation of oxygen : $7.78\times 10^{-1} M/s$

Rate of the reaction(R) = $\frac{-1}{2}\frac{d[O_3]}{dt}=\frac{1}{3}\frac{d[O_2]}{dt}$

$R=\frac{1}{3}\frac{d[O_2]}{dt}$

Rate of formation of oxygen=3 × (R)

$7.78\times 10^{-1} M/s=3\times R$

Rate of the reaction(R): $0.2593 M/s$

Rate of the reaction is 0.2593 M/s

Rate of disappearance of the ozone:

$R=-\frac{1}{2}\frac{d[O_3]}{dt}$

$\frac{d[O_3]}{dt}=-2\times R=-2\times 0.2593\times M/s=-0.5186M/s$

-0.5186 M/s is the rate of the loss of ozone.

6 0

3 years ago

Why is combustion of fuel necessary for heat engines to do work?

azamat

Because during combustion reaction, heat energy is released and it's this energy that is converted to work

6 0

3 years ago

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Explain how to count the number of elements in a compound

valentina_108 [34]

Answer:

Using the formula cards again, add the coefficient of 2 in front of the formula and have them recalculate the number of each element and the total number of atoms in each element.

Explanation:

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3 years ago

Match the scientists to their contributions to the development of the periodic table.

stiv31 [10]

Where’s the chart and scientists?

3 0

3 years ago