Using the Periodic Table, what can you say about the element magnesium (Mg)?
A. it has 2 neutrons and 3 protons
B. it has 3 electron shells
C. it has 3 electrons in the outer shell
D. All of these choices are correct.
Answer: B
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A typical sample of brass is 67% (w/w) copper and 33% (w/w) zinc. How many moles of zinc are dissolved in 67 grams of copper?
A) 0.33 mol B) 0.50 mol C) 0.67 mol D) 1.0 mol
The zone of the tropics is defined by the 67 degrees of latitude, where the sun can be overhead at 90° during some time of the year
Indicate whether the statement is true or false
The jet stream flows?
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