How many valence electrons are associated with the positively charged carbon in a carbocation?
A) 4
B) 6
C) 7
D) 8
B
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Which of the following is the most abundant long-lived greenhouse gas in our atmosphere?
A) Methane B) Water vapor C) Nitrous oxide D) Carbon dioxide
Answer the following statement(s) true (T) or false (F)
1. The spread of Western culture such as food and drink, movies and TV programs has wiped out local cultural differences. 2. People of the world are less aware of what is happening far away than they used to be. 3. Economic globalization has no impact on social or cultural features of regions. 4. "Localization" involves no region larger than a local community. 5. The dominant political entities are country governments.
Why are seafloor sediments useful in studying past climates?
What will be an ideal response?
Which of the following terms refers to the bending of light that occurs when it enters and passes through a substance of different density?
A. scattering B. diffraction C. reflection D. refraction