Question 1 0

A substance that cannot be broken down into other substances by ordinary chemical procedures is a(n) _____.

Which of the following is a trace element required by humans?

Changing the number of _____ would change an atom into an atom of a different element.

The atoms of different carbon isotopes _____.

How an atom behaves chemically when it comes into contact with other atoms is determined by its _____.

Which of the following is important for biological molecules?

A covalent bond is formed when _____.

Hydrogen bonding is most often seen _____.

Chemical equilibrium is reached when _______.