Why are water storage tanks usually built on towers or placed on hilltops?

Dead leaves decaying, is it a chemical or physical change

How did Dalton gather evidence for the existence of atoms? A. by observing an element's atomic structure through a microscope B. by calculating the number of subatomic particles in an element C.

The mass of a solid is 3.60 grams and it's volume is 1.8 cubic centimeters. What is the density of the solid expressed to the correct number of significant numbers

All-sized companies are required to have a written fire prevention plan.

Which of the following is an example of how research into the effects of a chemical has changed how it is used? A. Finding out that a pesticide is dangerous but continuing to use it B.

Does a gas discharge tube filled with boron emit the same wavelength

What is HNO3 it's formula

Which indicator would be the best to use for a titration between 0.10 m hcooh with 0.10 m naoh? you will probably need to consult the appropriate table in the book. 1. methyl red, color change at ph 3-5 2.

How are elements group into families

How many moles of lithium are in 83 grams of lithium?