Explanation:
The basis for classifying changes in matter into physical and chemical change is to see if a material is altered after going through a process.
In a physical change only the state of matter is usually altered especially its form or shape.
Chemical change alters a substance by producing new kinds that are totally different from it.
- In a chemical change, new kinds of matter are usually formed.
- Such changes are usually irreversible.
- Change of state is a reversible process.
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Cl is stable as a diatomic molecule where the 2 Cl atoms are held together by a covalent bond
molar mass of the diatomic molecule is 70.9 g/mol
therefore 70.9 g of Cl₂ is - 1 mol
then 140 g of Cl₂ is - 1/70.9 x 140 = 1.97 mol
there are 1.97 mol of Cl₂ present
Answer:
Chloride (Cl⁻) and sodium (Na⁺) ions.
Explanation:
Hello,
In this case, since the aqueous species are actually dissociated when reacting and the solid species (ferric carbonate) remains undissolved, we can modify the given reaction as follows:
![FeCl_2(aq) + Na_2CO_3(aq) \rightarrow FeCO_3(s) + 2NaCl(aq)](https://tex.z-dn.net/?f=FeCl_2%28aq%29%20%2B%20Na_2CO_3%28aq%29%20%5Crightarrow%20FeCO_3%28s%29%20%2B%202NaCl%28aq%29)
In such a way, dissociating the aqueous species we obtain:
![Fe^{2+}(aq)+2Cl^-(aq) + 2Na^+(aq)+CO_3^{2-}(aq) \rightarrow FeCO_3(s) + 2Na^+(aq)+2Cl^-(aq)](https://tex.z-dn.net/?f=Fe%5E%7B2%2B%7D%28aq%29%2B2Cl%5E-%28aq%29%20%2B%202Na%5E%2B%28aq%29%2BCO_3%5E%7B2-%7D%28aq%29%20%5Crightarrow%20FeCO_3%28s%29%20%2B%202Na%5E%2B%28aq%29%2B2Cl%5E-%28aq%29)
It means that the net ionic equation is:
![Fe^{2+}(aq)+CO_3^{2-}(aq) \rightarrow FeCO_3(s)](https://tex.z-dn.net/?f=Fe%5E%7B2%2B%7D%28aq%29%2BCO_3%5E%7B2-%7D%28aq%29%20%5Crightarrow%20FeCO_3%28s%29)
Therefore, the spectator ions are those were cancelled out, chloride (Cl⁻) and sodium (Na⁺).
Best regards.
when you hit a chemical with hammer and it was frozen only its physical properties will change and not he chemical properties,
when heated it may decompose to other chemical
when you hit with hamer it physical appearance will change but it remains chemically the same
when you put in salt solution , it wil interact with ions and its chemical properties changes
similarly when it was frozen, it retains its chemical properties.