Astudent writes in a laboratory notebook: i placed a piece of iron in a beaker of water and the iron sank to the bottom of the beaker. -- what the student wrote in the laboratory notebook is an example of a(n) *
1. observation
2. prediction
3. inference
hypothesis

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.