The "Van Gogh" one is subjective, because it expresses opinion and is not a true, hard fact. :)
Answer: HCl
Explanation:
calcium carbonate dissolves in HCl acid producing CO 2 gas. It will not dissolve in pure water. The Ksp for calcium carbonate in water is 3.4 x 10-9 moldm-3 which is very low. What takes place here is actually a chemical reaction:
CaCO 3 (s) + 2HCl(aq) → CaCl 2 (aq) + H 2CO 3(aq)
This reaction accounts for the solubility of the Calcium carbonate in HCl and not in pure water.
The third one
synthesis reactions have multiple reactants that synthesize into one product
Both have a continuous light spectra the fluorescent source makes a spectra with more intense bands of mercury
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