Mass is neither created nor destroyed/ same before and after reaction

Mass is neither created nor destroyed/ same before and after reaction

• A. Nucleus
• B. Conservation of mass
• C. Electron
• D. Atom

Answer: (B)

Mass is conserved in chemical reactions: the total amount of matter before a reaction is the same as after. Atoms are simply rearranged to form new substances, but they aren’t created or destroyed, so the total mass doesn’t change. This idea is called the conservation of mass. It’s why chemical equations are balanced: the same number and kind of atoms appear on both sides, ensuring the mass is the same before and after. The other terms describe parts of matter—the nucleus, the electron, and the atom—but they don’t express the rule that mass stays constant during a reaction.

Mass is conserved in chemical reactions: the total amount of matter before a reaction is the same as after. Atoms are simply rearranged to form new substances, but they aren’t created or destroyed, so the total mass doesn’t change. This idea is called the conservation of mass. It’s why chemical equations are balanced: the same number and kind of atoms appear on both sides, ensuring the mass is the same before and after. The other terms describe parts of matter—the nucleus, the electron, and the atom—but they don’t express the rule that mass stays constant during a reaction.