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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Answer:
1.385 x 1025 molecules are there in 23 mole of oxygen
Ionic compounds. because when in solid form they are held firmly in place therefore they cannot move to conduct electric current.
Answer:
(a) ![BaCl_2(aq)+Na_2SO_4(aq)\rightarrow BaSO_4(s)+2NaCl(aq)](https://tex.z-dn.net/?f=BaCl_2%28aq%29%2BNa_2SO_4%28aq%29%5Crightarrow%20BaSO_4%28s%29%2B2NaCl%28aq%29)
(b) The particles of the formed barium sulfate remain suspended in the aqueous media forming a colloid.
Explanation:
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In this case, when solutions of barium chloride and sodium sulfate are mixed, the following chemical reaction is carried out:
![BaCl_2(aq)+Na_2SO_4(aq)\rightarrow BaSO_4(s)+2NaCl(aq)](https://tex.z-dn.net/?f=BaCl_2%28aq%29%2BNa_2SO_4%28aq%29%5Crightarrow%20BaSO_4%28s%29%2B2NaCl%28aq%29)
Thus, we can notice that the product barium sulfate remains solid since its solubility in aqueous media is very low, for that reason at the beginning the solution becomes cloudy as its particles remain suspended in the water forming a colloid. Nevertheless, after some days, the suspended particles get precipitated by the effect of the gravity, therefore, we observe the solid on the bottom of the beaker.
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The Roman numerals in a cation's name indicate: THE POSITIVE CHARGE ON THE CATION
Cations are metallic atoms that loosely hold it electrons, making it easy to lose electrons.
The Roman numerals in a cation's name not only indicates the charge on the cation but it makes it easier to distinguish cations that share the same metal name.