Answer:
Burning a match
Explanation:
A chemical change is where a substance is changed into one or more substances. Basically, a chemical change changes the form of a substance. While, a physical change such as ripping a piece of paper in half will still be a paper just in half(nothing is changed).
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Answer:
c. Cr
Explanation:
![Cr^3+(aq) + CO_3^2-(aq) ------------> Cr_2CO_3(s)](https://tex.z-dn.net/?f=Cr%5E3%2B%28aq%29%20%2B%20CO_3%5E2-%28aq%29%20------------%3E%20Cr_2CO_3%28s%29)
The compound is containing
ion.
If acid reacts with it, CO_2 evolves.
![H^+ + CO_3^2- ----------> H_2O + CO_2](https://tex.z-dn.net/?f=H%5E%2B%20%2B%20CO_3%5E2-%20----------%3E%20H_2O%20%2B%20CO_2)
therefore, Cr would form a precipitate when added to an aqueous solution of this compound. Cr2CO3 is the precipitate.
Conducters e.g gold copper silver
Answer:
magnesium ion Hg2+ cation is formed