EVERYDAY SCIENCE

Detailed explanation-1: -The law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed. For example, the carbon atom in coal becomes carbon dioxide when it is burned. The carbon atom changes from a solid structure to a gas but its mass does not change.

Detailed explanation-2: -If you count up the number of each type of atom on the left of the arrow (reactants), you’ll see that there are an equal number on the right (products), just bonded in different arrangements. No new atoms are created during the reaction and no existing atoms disappear or are destroyed, so mass is conserved.

Detailed explanation-3: -Explain that whether a process involves melting, dissolving, or a chemical reaction, all the atoms that were there before the process takes place are still there after any changes have occurred, so the overall mass stays the same.

Detailed explanation-4: -When ice melts into water, it’s a physical change. The mass of the water after melting is same as the mass of ice before meling.

Detailed explanation-5: -Chemical properties are properties that can be measured or observed only when matter undergoes a change to become an entirely different kind of matter. They include reactivity, flammability, and the ability to rust. Reactivity is the ability of matter to react chemically with other substances.