Which is an example of a physical change? a) metal tarnishing
b) nail rusting
c) formation of precipitate
d) dissolving sugar in water

Think about how you can use le chatelier’s principle to find possible solutions to the design problem. describe at least two ways to increase the yield (amount) of ammonia based on this principle.

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here