Whenever ___ energy is needed

Natasha2012 [34]

Answer:

A star is a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity. Nuclear fusion reactions in its core support the star against gravity and produce photons and heat, as well as small amounts of heavier elements. The Sun is the closest star to Earth.

Explanation:

5 0

3 years ago

Circle the correct one from given alternatives.

mash [69]

Answer:

24 is the correct anwer

this the anwer text this u no

3 0

2 years ago

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Which term below best matches a potential energy diagram in which the potential energy value of the reactants is less than that

ivann1987 [24]

The correct answer is D, the Endothermic Process.

Hope I helped. :)

4 0

3 years ago

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Determine how the following bonds are made using Lewis dots structures

garri49 [273]

Answer :

1.) $Ca^{2+}+2Cl^-\rightarrow CaCl_2$

Calcium has 2 valence electrons and chlorine has 7 valence electrons. For neutral molecule, 2 chlorine atoms share their valence electrons with 1 calcium atom. The bonds are formed between the calcium and chlorine atom.

2.) $Al^{3+}+3F^-\rightarrow AlF_3$

Aluminium has 3 valence electrons and fluorine has 7 valence electrons. For neutral molecule, 3 fluorine atoms share their valence electrons with 1 aluminium atom. The bonds are formed between the aluminium and fluorine atom.

3.) $H^{+}+Cl^-\rightarrow HCl$

Hydrogen has 1 valence electron and chlorine has 7 valence electrons. For neutral molecule, 1 chlorine atom share their valence electrons with 1 hydrogen atom. The bonds are formed between the hydrogen and chlorine atom.

4.) $2H^{+}+S^{2-}\rightarrow H_2S$

Hydrogen has 1 valence electron and sulfur has 6 valence electrons. For neutral molecule, 2 hydrogen atoms share their valence electrons with 1 sulfur atom. The bonds are formed between the hydrogen and sulfur atom.

5.) $Cl^{-}+Cl^-\rightarrow Cl_2$

Chlorine has 7 valence electrons. For neutral molecule, 1 chlorine atom share their valence electrons with 1 chlorine atom. The bonds are formed between chlorine and chlorine atom.

The lewis-dot structure image is shown below.

5 0

3 years ago

Which of the following metals (M) will form an ionic compound with nitrogen with the general formula M3N2? Hint: Think about how

Basile [38]

Answer:

See explanation

Explanation:

The question is incomplete but i will try to give you all the necessary guide that you need in order to answer the question.

When compounds are formed, atoms exchange valency. The valency of nitrogen is three while that of the metal is two. The exchange yields M3N2.

If the compound has been specifically mentioned to be a metal, then it must be a group two element. It could be any of Mg, Ca, Sr, Ba or Ra. I did not mention Be here because most of its compounds are covalent.

This will help you to answer the complete question.

5 0

3 years ago

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