For how many seconds each respiration occurs?

Drain cleaner has a pH of about 14. How can it be classified, based on its pH?

Is glass homogenous or heterogenous

What is the volume in liters of a cube whose edge is 4.33 cm long?

How did the growth of ideals of mass democracy, including such concerns as expanding suffrage, public education, abolitionism, and care for the needy affect political life and discourse?

An adults height may be about

A neutral atom of beryllium (Be) has an average mass of 9 amu and 4 electrons. How many neutrons does it have? 13 9 5 4

Calculate the maximum mass of carbon dioxide that could be obtained by adding excess hydrochloric acid to 15 g of calcium carbonate.

True or false: during dry weather, the water level in a small pond drops because of runoff.

Bradley hit a baseball with a bat. The baseball then hit a window and caused the window to break. Where did the energy that broke the window come from?

An observation which requieres measuresment is called