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mamaluj [8]
3 years ago
10

What is a chemical change and what is a chemical property? Give Example.

Chemistry
2 answers:
nordsb [41]3 years ago
8 0
Look it up on google
White raven [17]3 years ago
4 0
Physical changes<span> are the changing in the physical state of the substance. The physical </span>change can be melting, evaporation, or boiling, but during a chemical reaction<span> the atoms within a substance are rearranged into different combinations. For </span>example<span>, sugar undergoes a </span>chemical change<span> when it is cooked to make caramel.</span>
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Hydrogen sulfide burns form sulfur dioxide:
Helga [31]

Answer: 404.04 kJ.

Explanation:

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}

moles of H_2S

\text{Number of moles}=\frac{26.7g}{34.1g/mol}=0.78moles

2H_2S(g)+3O_2(g)\rightarrow 2SO_2(g)+2H_2O(g)    \Delta H=-1036kJ

According to stoichiometry :

2 moles of H_2S on burning produces = 1036 kJ

Thus 0.78 moles of H_2S on burning produces =\frac{1036kJ}{2}\times 0.78=404.04

Thus the enthalpy change when burning 26.7 g of hydrogen sulfide is 404.04 kJ.

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3 years ago
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Arisa [49]

Answer:

6.132

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