How Much Energy (KJ)is Released If 10 $\rarr$ Al₂O₃(s)+ 2Fe(l) $\Delta$ H° = - 822

question 3

Multiple Choice

How much energy (kJ) is released if 10.0g of Al(s) is reacted with excess Fe₂O₃(s) in the thermite reaction: 2Al(s) + Fe₂O₃(s) $\rarr$ Al₂O₃(s) + 2Fe(l) $\Delta$ H° = - 822.8 kJ/mol

• A)8,230 kJ
• B)823 kJ
• C)305 kJ
• D)152 kJ
• E)4,110 kJ

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Definitions:

Independent Variable

The variable manipulated by the researcher that is assumed to lead to changes in the dependent variable.

"Knew It All Along" Phenomenon

Also known as hindsight bias, it's the tendency to believe, after learning an outcome, that one would have predicted it, or known it was going to happen.

Methodological Crisis

a situation in a field of study marked by a questioning of traditional research methods and the validity of their results, often leading to reforms.

.05 Level Of Significance

A statistical threshold indicating that the probability of the observed results occurring by chance is 5% or less, suggesting that the results are statistically significant.