The rings of Uranus are easily visible from Earth
Indicate whether the statement is true or false
False
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Which of the following polyatomic ions has a single minus charge?
a. Acetate b. Sulfate c. Phosphate d. Ammonium
Which of the following is a statement of the third law of thermodynamics?
A) If two objects are in equilibrium with a third, then they are in thermal equilibrium with one another. B) The entropy of the universe cannot decrease. C) The entropy of the universe cannot increase. D) All reversible engines operating between the same two temperatures have the same efficiency. E) It is impossible to lower the temperature of an object to absolute zero in a finite number of steps.
Which is more likely to cause more damage to skin - a burn caused by water at 100°C or a burn caused by steam at 100°C?
A. The burn caused by water. B. The burn caused by steam. C. There is no difference.
Why are elements with even numbers of protons more abundant, on average, than elements with odd numbers of protons?
A) because when elements split in a fission reaction, they prefer to split with all the protons paired B) because elements are mainly made in fusion reactions with hydrogen nuclei C) because elements are mainly made in fusion reactions with helium nuclei D) There's no explanation; it's something of a mystery to be explained or it may be a coincidence.