3 years ago

Which of the following are examples of an Element?

Chemistry

2 answers:

photoshop1234 [79]3 years ago

6 0

Answer:

B. Substance 1 and 3.

Explanation:

1 and 3 and the elements oxygen and helium. 2 is water, a compound, and 4 is table salt, another compound

Elanso [62]3 years ago

4 0

Answer:

Explanation:

Substance two and 4 are both compounds

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In a hydrogen fuel cell, hydrogen gas and oxygen gas are combined to form water. Write the balanced chemical equation describing

xxTIMURxx [149]

<u>Answer:</u> The chemical reaction is given below.

<u>Explanation:</u>

A fuel cell is defined as the electrochemical cell which converts the chemical energy of a fuel (often used hydrogen) and an oxidizing agent (often used oxygen) into electrical energy via a pair of redox reactions.

The reactions which occur in hydrogen-oxygen fuel cell are:

At cathode: $H_2+2OH^-\rightarrow 2H_2O+2e^-$

At anode: $\frac{1}{2}O_2+H_2O+2e^-\rightarrow 2OH^-$

Net reaction: $H_2+\frac{1}{2}O_2\rightarrow H_2O$

Thus, the chemical reaction is given above.

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4 years ago

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3 years ago

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The formula equation of Sodium carbonate + hydrochloric acid

dusya [7]

Answer:

the reaction is: Na2CO3 + 2HCl ===》 2NaCl + H2O + CO2(g)

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3 years ago

Formula: C8H9O2N

hammer [34]

There are 9 H atoms in one molecule, so hydrogen is present in the greatest proportion by number of particles; The ratio by particles is C:H:O:N = 8:9:2:1.

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3 years ago

When converting from kilometers to meters, the decimal is moved______? three places to the left, two places to the left, three p

konstantin123 [22]

Answer:

three spaces to the left

Explanation:

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