.. Identify how many atoms of each element are in the molecule: H2O2

Answer : There are 2 atoms of hydrogen element and 2 atoms of oxygen element are in molecule.

Explanation:

Molecule : It is the smallest particle in the chemical compound or chemical element that has the same chemical properties of that compound or element.

Atom : It is the smallest unit of matter.

The given molecule is .

In the molecule of , there are two elements which are hydrogen and oxygen.

In the molecule of , there are 2 atoms of hydrogen element and there are 2 atoms of oxygen element.

Hence, there are 2 atoms of hydrogen element and 2 atoms of oxygen element are in molecule.

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answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error