According to the reaction below, hydrogen gas is one substance produced as a result of the single replacement reaction that occurs when calcium and water react. If the reaction occurs at standard temperature and pressure conditions, how many liters of hydrogen gas will be produced when 8.08 x 10^23 molecules of water are reacted? * Ca + 2H2O -- Ca(OH)2 + H2

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

i'm pretty sure it is letter c.) car

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

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explanation: