Question

H2O→H2→H2O→O2->CuO->C4

Answer 1

2H2O + Ca -> Ca(OH)2 + H2

2H2 + O2 -> 2H2O

2H2O -> 2H2 + O2

2Cu + O2 -> 2CuO

2CuO -> 2Cu + O2

Answer 2

The sequence you provided seems to describe a series of chemical reactions. Let's break it down step by step:

1. H2O: This represents water, which is a molecule made up of two hydrogen atoms bonded to one oxygen atom.

2. H2: The arrow indicates a reaction has occurred, converting water (H2O) into hydrogen gas (H2). This reaction is known as water electrolysis, where an electric current is passed through water to break it down into its constituent elements.

3. H2O: The arrow indicates another reaction, converting hydrogen gas (H2) back into water (H2O). This reaction is known as the combustion of hydrogen, where hydrogen combines with oxygen from the air to form water.

4. O2: The arrow indicates a reaction where water (H2O) is decomposed into oxygen gas (O2). This can be achieved through various methods, such as electrolysis or thermal decomposition.

5. CuO: The arrow indicates a reaction, converting oxygen gas (O2) into copper(II) oxide (CuO). Copper oxide is a compound composed of copper and oxygen.

6. C4: Unfortunately, the context of this symbol is unclear. Without further information, it is difficult to determine the exact meaning of "C4" in this sequence.

Please provide more information or clarify the meaning of "C4" if you need further assistance.