When humans burn fuel or

cut down trees, they (increase/decrease)

levels of carbon dioxide in the atmosphere.

What are the two roles that the pancreas plays?

How many hydrogen atoms are in 1 mol of C3H8

1. What is the difference between an atom and a compound?

What is the scientific explanation of why we see stars at different times of the day and why are stars bigger than they appear to be?

A basketball weigh more after it was inflated with air then when it was deflated how does this show that gas is matter

Which of the following choices will an atom of nitrogen (N) be most likely to bond with? A. 2 calcium (Ca) atoms B. 1 hydrogen (H) atom C. 3 lithium (Li) atoms D. 2 carbon (C) atoms

Explain why the lattice energy and the energy of crystallization of a substance differ in sign but are equal in magnitude.

barium chloride (Ba (CIO3) 2) breaks down to form barium chloride and oxygen. what is the balanced equation for this equation?

What might happen to the sickle-cell mutation if malaria in Africa were eliminated?

If a substance conducts heat easily, it is considered to be a