An element found in another galaxy exists as two isotopes. If 80.0% of the atoms have an atomic mass of 80.00 atomic mass units and the other 20.0% have an atomic mass of 82.00 atomic mass units, what is the atomic mass of the element?
A. 64.0 atomic mass units
B. 80.4 atomic mass units
C. 81.6 atomic mass units
D. 16.4 atomic mass units
E. 81.0 atomic mass units
Answer: B
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If a time machine transported you to the early days of the Earth's atmosphere, before plants and animals existed on our planet, which of the following best describes what would happen?
A. You would slowly photodissociate. B. You would be crushed by the atmospheric pressure. C. There would be enough oxygen in the air for you to breathe. D. You would be outgassed.
How do the eruptions that created the Columbia Plateau differ from eruptions that create large composite volcanoes?
What will be an ideal response?
The important general conclusion that can be made from this data on herbivory is that ________
A) herbivory is in equilibrium at distance represented by dotted line B) herbivory increases tropical tree diversity C) herbivory decreases tropical tree diversity D) more field studies are needed before any conclusion can be made E) controlled herbivory can be beneficial during field studies
In less-developed countries, open fires and inefficient stoves that burn wood, charcoal, or coal are important sources of indoor air pollution.?
Answer the following statement true (T) or false (F)