Which statement best describes the law of conservation of mass?

A. Matter cannot be created or destroyed in a chemical reaction
B. Reactants in a chemical reaction rearrange to form a new substance or substances
C. Reactants and products cannot escape from a closed system
D. Chemical symbols are used to show atom balance before and after a reaction.

1. Matter cannot be created or destroyed in a chemical reaction

2. Numbers of reactant and product atoms
3. 20 g
4. A sealed jar of salad dressing
5. Two

Thought I’d give back a lil since I couldn’t find these answers online <3

You're Awesome Samado

Samado is 100% correct. Thank you so much!

100% correct

samando is correct 100%

Samado? nah dude this is definitely a Kamado

Thank you sm<3

Samado is still correct as of april 4,2022

Seems to be 100% correct as of 4/19/22.

The correct answer is A. Matter cannot be created or destroyed in a chemical reaction.

To understand why this statement best describes the law of conservation of mass, let's break it down. The law of conservation of mass states that the total mass of all substances involved in a chemical reaction remains constant over time. This means that matter cannot be created or destroyed in a chemical reaction, it can only change forms.

To explain how to arrive at this answer, we can use the process of elimination.

Option B, "Reactants in a chemical reaction rearrange to form a new substance or substances," does not capture the essence of the law of conservation of mass. While it may be true that reactants rearrange during a chemical reaction, this statement does not address the conservation of mass aspect of the law.

Option C, "Reactants and products cannot escape from a closed system," is not an accurate description of the law of conservation of mass. The conservation of mass applies to the total mass of the substances involved in a chemical reaction, regardless of whether it takes place in an open or closed system.

Option D, "Chemical symbols are used to show atom balance before and after a reaction," describes the concept of atom balance, but it does not explicitly state that matter cannot be created or destroyed. The law of conservation of mass goes beyond simply balancing atoms; it states that the total mass before and after a chemical reaction should remain the same.

Therefore, the best statement that describes the law of conservation of mass is A. Matter cannot be created or destroyed in a chemical reaction.