Which of these is MOST responsible for chemical reactions?

Electrons in the highest occupied energy level of an atom determines an elements -

How many atoms are present in one molecule of NaHCO2?

Which compound has the following : 3 Oxygen, 1 Carbon, 2 Sodium

What is a covalent bond?

A melting ice cube is undergoing what type of change?

Which of the following is an example of a physical change?

Which of the following is an example of a chemical change?

When cars are left in a junk yard, what was once shiny steel turns into brown, brittle rust. What type of change is this?

When you combine vinegar and baking soda, it gives off gas. The reactants are vinegar and baking soda, what is the gas

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