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ludmilkaskok [199]
4 years ago
15

Student mixes 5 g of sand into a beaker of 20 g of water. Is this a physical or chemical change-why?

Chemistry
1 answer:
oee [108]4 years ago
8 0
Physical change. the sand is not dissolving into the water, but simply finding a place in it.
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Answer:

∴ΔH₂ = - 12,258 KJ

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Given reactions are:

Reaction 1: C₃H₈(g)+5O₂(g)→ 3CO₂(g)+4H₂O,                 ΔH₁= - 2043 KJ

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We can think the reaction 2 as occurring 6 different container and each containers contains 1 molecule of C₃H₈. The enthalpy is an extensive property. Total enthapy of the 6 containers is = 6×(-2043 KJ)

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