Answer:
An acidic solution has a high concentration of hydrogen ions (H +start superscript, plus, end superscript), greater than that of pure water.
The colors are separated into the rainbow colors of red, orange, yellow, green, blue, indigo and violet (I always remember ROY G BIV to remember the colors).
Hope this helps! :)
To get the number of gold atoms, you have to divide the mass of the gold by the mass of the gold atom. It follows this simple equation

.
Let x be the number of gold atoms. Plug in the values to a calculator.
x =

Both have the same units so the unit gram(g) can be cancelled.
x then would be equal to 1.53x10^22. So there are 1.53x10^22 atoms of gold in 5 g of gold
The answer I believe would be A
Answer: temperature and precipitation are the 2 most important factors that affect climate