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masya89 [10]
3 years ago
9

Evidence of a chemical change does NOT include A) producing a gas. B) change in color. C) change in shape. D) change in temperat

ure.
Chemistry
2 answers:
Ahat [919]3 years ago
5 0
I think the correct answer is c
Vlada [557]3 years ago
3 0

its B

at first i thought it was c but its B.

.k                                             .  

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PLEASE HELP WITH THESE TWO QUESTIONS
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1. Q=112.8 kJ

2. Q=5.01 kJ

<h3>Further explanation</h3>

The heat required for phase change :

  • melting/freezing :

Q = mLf

Lf=latent heat of fusion

  • vaporization/condensation

Q = mLv

Lv=latent heat of vaporization

1.

m=50 g=0.05 kg

Lv (water) = 2256 kJ/kg

\tt Q=0.05\times 2256=112.8~kJ

2.

m=15 g=0.015 kg

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