7.4 Chemical reactions
What is an atom?
Understanding Chemical Change
Matter is made up of particles. The very simplest of these particles are called atoms. Atoms are the building blocks from which all substances are made.
Matter is made up of particles. The very simplest of these particles are called atoms. Atoms are the building blocks from which all substances are made.
- Atoms rarely exist by themselves- usually grouped together to form clusters called molecules
This is known as the atomic theory of matter!
Just how small is an atom?????????
Chemical Reactions
Atoms are rearranged in a chemical reaction. The substances that:
No atoms are created or destroyed in a chemical reaction. This means that the total mass of the reactants is the same as the total mass of the products. We say that mass is conserved in a chemical reaction.
Atoms are rearranged in a chemical reaction. The substances that:
No atoms are created or destroyed in a chemical reaction. This means that the total mass of the reactants is the same as the total mass of the products. We say that mass is conserved in a chemical reaction.