Planck suggested that light/energy was absorbed/released in certain amounts, called quanta.
Physical change - No change of matter in this phase
chemical change - All types of phase change occur here
Answer: Each ion, or atom, has a particular mass; similarly, each mole of a given pure substance also has a definite mass. The mass of one mole of atoms of a pure element in grams is equivalent to the atomic mass of that element in atomic mass units (amu) or in grams per mole (g/mol).
Explanation:
A base and an Acid always react to form a salt and water
So, HCl + NaOH —> NaCl + HOH