Including cis-trans isomers, how many different alkenes have the molecular formula C4H8?
A) 2
B) 3
C) 4
D) 5
C
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Gravity always acts downward, which tells us that acceleration due to gravity
A. acts upward. B. acts downward. C. sometime acts upward as well as downward. D. none of the above
Use the bond energies below to determine whether the following reaction is exothermic or endothermic: H2 + Cl2 ? 2 HCL H-H (bond energy: 436 kJ/mol) Cl-Cl (bond energy: 243 kJ/mol) H-Cl (bond energy: 431 kJ/mol)
A) exothermic with more than 50 kJ of energy released B) endothermic with more than 50 kJ of energy absorbed C) exothermic with less than 50 kJ of energy released D) endothermic with less than 50 kJ of energy absorbed
Land cools more slowly than water during autumn because the land has a smaller specific heat value
Indicate whether the statement is true or false
What capital letter does the Köppen system use to identify a tropical climate?
a. E b. H c. D d. A