Chemistry, 13.11.2019 05:31, eduardo2433

Choose all the answers that apply.

which of the following equations are balanced?

2h2 + o2 → 2h2o

2s + 3o2 → 2so3

li + cl2 → licl

2k + 2h2o → h2 + 2koh

2fe + cu(no3)2 → 2cu + fe(no3)2

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answered: natalie9316

Answer : The balanced chemical equations are:

$2H_2+O_2\rightarrow 2H_2O$

$2S+3O_2\rightarrow 2SO_3$

$2K+2H_2O\rightarrow H_2+2KOH$

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

(1) The given chemical reaction is,

$2H_2+O_2\rightarrow 2H_2O$

This reaction is a balanced chemical reaction because in this reaction the number of atoms of individual elements present on reactant side must be equal to the product side.

(2) The given chemical reaction is,

$2S+3O_2\rightarrow 2SO_3$

This reaction is a balanced chemical reaction because in this reaction the number of atoms of individual elements present on reactant side must be equal to the product side.

(3) The given chemical reaction is,

$Li+Cl_2\rightarrow LiCl$

This reaction is an unbalanced chemical reaction because in this reaction the number of chlorine atoms are not balanced.

In order to balance the chemical equation, the coefficient '2' put before the $LiCl \text{and }Li$ and we get the balanced chemical equation.

The balanced chemical reaction will be,

$2Li+Cl_2\rightarrow 2LiCl$

(4) The given chemical reaction is,

$2K+2H_2O\rightarrow H_2+2KOH$

This reaction is a balanced chemical reaction because in this reaction the number of atoms of individual elements present on reactant side must be equal to the product side.

(5) The given chemical reaction is,

$2Fe+Cu(NO_3)_2\rightarrow 2Cu+Fe(NO_3)_2$

This reaction is an unbalanced chemical reaction because in this reaction the number of iron and copper atoms are not balanced.

In order to balance the chemical equation, we are removing the coefficient '2' that present before $Fe\text{and }Cu$ and we get the balanced chemical equation.

The balanced chemical reaction will be,

$Fe+Cu(NO_3)_2\rightarrow Cu+Fe(NO_3)_2$

answered: Guest

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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answered: Guest

All the elements are arranged by melting points on the periodic table. in row they go from metals to gasses. in the row from sodium to argon, sodium is more reactive than the one on its right, magnesium.

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which of the following equations are balanced?
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