Answer:
Endothermic.
Explanation:
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In this case, it is necessary to keep in mind that exothermic processes are characterized by the release of energy and the endothermic processes by the absorption of heat. In such a way, every process from solid to liquid or gas is endothermic as they require energy to separate the molecules and therefore turn out in the phase change. On the other hand, every process from gas to liquid or solid is exothermic as heat is released to rejoin the molecules and produce the phase change.
Therefore, since solid water molecules tend to be well-arranged, it is necessary to add heat to the system to produce the phase change until gas; in such a way, this process is endothermic as energy must be absorbed by the ice.
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Answer:
![n_{base}=3.90x10^{-3}molNaOH](https://tex.z-dn.net/?f=n_%7Bbase%7D%3D3.90x10%5E%7B-3%7DmolNaOH)
Explanation:
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In this case, since the sulfuric acid and sodium hydroxide react in a 1:2 mole ratio, given the reaction, we realize they have the following mole ratio at the equivalence point:
![2*n_{acid}=n_{base}](https://tex.z-dn.net/?f=2%2An_%7Bacid%7D%3Dn_%7Bbase%7D)
Which in terms of concentrations and volumes is:
![2*M_{acid}V_{acid}=n_{base}](https://tex.z-dn.net/?f=2%2AM_%7Bacid%7DV_%7Bacid%7D%3Dn_%7Bbase%7D)
Thus, we can plug in the volume and concentration of acid to find the moles of base:
![n_{base}=0.04402L*0.0885\frac{mol}{L} \\\\n_{base}=3.90x10^{-3}molNaOH](https://tex.z-dn.net/?f=n_%7Bbase%7D%3D0.04402L%2A0.0885%5Cfrac%7Bmol%7D%7BL%7D%20%5C%5C%5C%5Cn_%7Bbase%7D%3D3.90x10%5E%7B-3%7DmolNaOH)
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<h3><u>Answer;</u></h3>
1)Ba(ClO3)2(s)--->BaCl2(s)+3O2(g) - Redox reaction
2)2NaCl(aq)+K2S(aq)--->Na2S(aq)+2KCl(aq) - None of the above
3)CaO(s)+CO2(g)--->CaCO3(s) - None of the above
4)KOH(aq)+AgCl(aq)---->KCl(aq)+AgOH(s)
-precipitation reaction
5)Ba(OH)2(aq)+2HNO2(aq)--->Ba(NO2)2(aq)+2H2O(l) - Acid-base neutralization reaction
<h3><u>Explanation;</u></h3>
- Ba(ClO3)2(s)--->BaCl2(s)+3O2(g)
In this reaction, chlorine is reduced and oxygen is oxidized. Both reduction and oxidation occur in this reaction. Therefore, this is a redox reaction.
- 2NaCl(aq)+K2S(aq)--->Na2S(aq)+2KCl(aq)
In this reaction, both Na2S and KCl are soluble in water. Therefore the reaction is non of the above. Since it can not be a double displacement reaction in which two compounds react and cations and anions exchange their places to form new compounds.
- CaO(s)+CO2(g)--->CaCO3(s)
In this reaction CaO and CO2 combine to form calcium carbonate. This is a synthesis reaction, and thus its none of the above choices
- KOH(aq)+AgCl(aq)---->KCl(aq)+AgOH(s)
In this reaction, the salt KCl is soluble in water and AgOH is insolubel in water. Therefore, this is a precipitation reaction.
- Ba(OH)2(aq)+2HNO2(aq)--->Ba(NO2)2(aq)+2H2O(l)
In this reaction, nitrous acid acts as an acid and barium hydroxide acts as a base. Therefore, barium hydroxide and nitrous acid react to form salt and water. Therefore, this reaction is acid-base neutralization reaction.
D. Ionic compound
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