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Aleonysh [2.5K]
3 years ago
10

a bar of gold is melted into liquid the liquid is then poured into a mold to make pieces of jewelry is the process a chemical ch

ange or a physical change ?
Chemistry
1 answer:
Leviafan [203]3 years ago
6 0
Physical change because it's only changing the shape of the gold.
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Given the balanced equation representing a reaction: 2h2o(l) + 571.6 kJ -> 2h2(g) + o2(g). What occurred as a result of this
Ivan

Answer: option D) energy was absorbed and entropy increased.


Explanation:


1) Given balanced equation:


2H₂O (l) + 571.6 kJ → 2 H₂ (g) + O₂(g).


2) Being the energy placed on the side of the reactants means that the energy is used (consumed or absorbed). This is an endothermic reaction.


So, the first part is that energy was absorbed.


3) As for the entropy, it is a measure of the disorder or radomness of the system.


Since, two molecules of liquid water were transformed into three molecules of gas, i.e. more molecules and more kinetic energy, therefore the new state has a greater degree of radomness, is more disordered, and you conclude that the entropy increased.


With that, you have shown that the right option is D) energy was absorbed and increased.

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3 years ago
decomposition of hydrogen peroxide produce water and oxygen . calculate the volume of O2 formed from the decomposition of 150 mL
Ugo [173]

Explanation:

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Volume of oxygen = 0.0015mol * (22.4dm³/mol) = 0.0336dm³.

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MAVERICK [17]

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