3 years ago

What element came from of the chemist who first published the periodic table?

1 answer:

6 0

<span>Dmitri Mendeleev published first the periodic. He didn't "discover" any elements but predicted where some would be on his table. These included Gallium and Germanium.</span>

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Why are atoms more stable when combined?

shepuryov [24]

Answer:

Explanation:

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3 years ago

Calculate the maximum amount of useful work that can be obtained and comment on the spontaneity for the reaction at 25C :

harkovskaia [24]

Answer:

$1.41 *10^{3} kJ/mol$

Explanation:

First, we find in the tables the ΔH of formation of each compound. As you can see in the (image 1)

Then we solve the ecuation for ΔH°reaction

ΔH°reaction=∑ΔH°f(products)−∑ΔH°f(Reactants)

ΔH°reaction= (-2* 393.5 - 2*285.8) - (52.4 + 0) kJ/mol

ΔH°reaction = -1.41 *10^3 kJ/mol

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3 years ago

Which of the following is the correct name for MgCl2?

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Answer:

Magnesium dichloride

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2 years ago

Using the idea that reactions occur as a result of collisions between particles, explain why reaction rates depend on the temper

PIT_PIT [208]

Increasing temperatures in a reaction increases the kinetic energy of the reactant molecules. This causes them to move fast and hence collide with a higher frequency. The higher the rate of collision between the molecules, the faster the reaction.

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2 years ago

The period of a sound 440-Hertz sound wave is how many second/second.

masha68 [24]

440 hertz = 440/seconds
1/440 seconds = period of the sound wave.
so Answer is 2.2727272* 10^-3 second or 1/440 seconds

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2 years ago