An aqueous solution contains 32.7% KCI (weight/weight %).
How many grams of water (H20) are
contained in 100 g of this solution?
Molar Mass
KCI: 74.55 g/mol
H2O: 18.016 g/mol
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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.

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explanation:

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.