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allochka39001 [22]
2 years ago
10

Which of the following are examples of a chemical change?

Chemistry
1 answer:
tamaranim1 [39]2 years ago
3 0

burning of paper, digestion of food are the example of chemical change

digestion of food is a chemical change because if we digest a food than it will come out in the dorm of stool so can we again change that stool into food

no so it is chemical change

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<u>Answer:</u>

<em>Silver tarnishing as the silver metal reacts with sulphur is a chemical change.</em>

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Normally, we would need a balanced equation with masses, moles, and molar masses, but we can get by with a partial equation, if the S atoms are balanced.

1. Gather all the information in one place:

M_r:                          34.08

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m/g:                             56  

2. Calculate the moles of H₂S

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                      = 1.64 mol H₂S

3. Calculate the moles of Au₂S₃

The molar ratio is 1 mol Au₂S₃/3 mol H₂S.

Moles of Au₂S₃ = 1.64 mol H₂S × (1 mol Au₂S₃/3 mol H₂S)

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