Hi,
This change is physical because there is no new formation of a new substance or any signs of a chemical change, only the physical properties change.
1.) NaOH + HCl → NaCl + H₂O
<span>
2.) Ca(OH)</span>₂ <span> + H</span>₂<span>SO4 </span>→<span> CaSO</span>₄ + 2H₂O
<span>
3.) 2HCl +Ba (OH)2 </span>→ <span> BaCl</span>₂ + 2H₂O
<span>
4.) HNO3 + LiOH </span>→ <span> LiNO</span>₃ <span> + H</span>₂O
<span>
5.) H</span>₂CO₃ + NaOH → Na₂CO₃ + H₂O
<span>
6.) KOH + HC</span>₂H₃O₂ → KC₂H₃O₂ <span>+ H</span>₂O
<span>
7.) Ba(OH)2 + HNO2 </span>→<span> Ba(NO</span>₂)₂<span> + H</span>₂O
<span>
8.) H</span>₂<span>SO</span>₃<span> + 2NaOH </span>→<span> Na</span>₂SO₃ <span>+ 2H</span>₂O
<span>
9.) H</span>₃<span>PO</span>₄<span> + 3KOH </span>→<span> K</span>₃PO₄ <span>+ 3H</span>₂O
<span>
10.) 2HBr + Ca(OH)2 </span>→<span> CaBr</span>₂ + 2H₂O
The reason why water is so recurrent is because of the general form that says: ACID + BASE → SALT + WATER
I took the liberty of balancing the equations.
<span>Moles = weight in g / atomic weight So, moles in 40 g of He = 40 / 4 = 10 moles.</span>
<span>Endothermic Reaction. This reaction or process absorbs energy from its surroundings, mostly, but will not always be, in form of heat. A reaction that requires the input of energy that breaks a bond will always be endothermic. Best examples of endothermic reaction are: 1) melting cubes; 2) evaporating of liquid; 3) melting solid salts, etc.</span>
