It’s positive when you use energy for work
Answer: B
Explanation:
Graph 1 represents an endothermic reaction, Graph 2 represents an exothermic reaction.
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I disagree, because a physical change changes the form, and a chemical change is a process where one or more substances are altered into new substances.
In an unknown liquid, the percentage composition with respect to carbon, hydrogen and iodine is 34.31%, 5.28% and 60.41% respectively.
Let the mass of liquid be 100 g thus, mass of carbon, hydrogen and oxygen will be 34.31 g, 5.28 g and 60.41 g respectively.
To calculate molecular formula of compound, convert mass into number of moles as follows:

Molar mass of carbon, hydrogen and iodine is 12 g/mol, 1 g/mol and 126.90 g/mol.
Taking the ratio:

Putting the values,

Thus, molecular formula of compound will be
.