Question 5
(02.02 LC)
Which of the following most likely happens during a physical change? (1...
Question 5
(02.02 LC)
Which of the following most likely happens during a physical change? (1 point)
O a
An irreversible process takes place.
Ob
Substance changes its form but not its molecular composition.
с
New atoms are introduced in the molecules of the substance.
d
A substance reacts differently with a chemical before and after the change.
Answers: 1
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Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)
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