AP BIOLOGY

BIOCHEMISTRY

ATOMIC STRUCTURE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What does the Law of Conservation of Mass state?
A
Matter cannot be gained or lost in a chemical reaction.
B
Matter can only be lost in a chemical reaction.
C
Matter can only be gained in a chemical reaction.
D
Matter can be gained and lost in a chemical reaction.
Explanation: 

Detailed explanation-1: -According to the law of conservation of mass, during any physical or chemical change, the matter is neither created nor destroyed. However, it may change from one form to another.

Detailed explanation-2: -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-3: -According to the law of conservation of mass, the mass before and after a chemical reaction remains the same. So the mass of the reactants is equal to the mass of the products.

Detailed explanation-4: -The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant.

Detailed explanation-5: -The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.

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