When acid rain falls on a lake, it makes the water in the lake acidic, which may be harmful to the aquatic plants and animals living in the lake by changing the pH of
their environment. Some lakes have a granite lake bed, while others have a limestone
lake bed. The primary ingredient in granite is silicon dioxide (SiO2), which does not
react with acids. The primary ingredient in limestone is calcium carbonate (CaCO3),
which will react with an acid, forming water carbon dioxide, and a calcium salt. Those
with a limestone lake bed are less affected by acid rain than those with a granite lake
bed. How would you explain this phenomenon?

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

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question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

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(jacemorris04)