In chemistry, some changes are reversible and some are irreversible, explain.

True or False: The atmosphere is the collection of gases surrounding the earth trapped by earth's gravity.

If you have 100 cheese burgers and it takes 120 second to eat 25 cheese burgers how many second will it take to eat show your work

Name 2 things besides sand that are not soluble in water

A solution of silver nitrate, when mixed with a solution of sodium chloride, forms a white precipitate. Mixing silver nitrate and hydrochloride acid also results in a precipitate.

What elements start with the letter T (periodic table)

Why does the body of the bird covered with feathers?

One molecule of caffeine contains 8 atoms of carbon, 10 atoms of hydrogen, 2 atoms of oxygen, 4 atoms of nitrogen. write the formula for caffeine with the elements in the order they are given.

A piece of magnesium metal is heated in the presence of chlorine gas, and a reaction takes place. What compound will most likely be produced? A. Mg2C1 B. MgCl3 C. MgCl2 D. MgCI

What is the pressure of the gas in this mercury manometer if h = 81 mm and atmospheric pressure is 749 mmHg

A microscope containing two or more lenses is an