Question

Check all the statements that are correct. Conservation of mass means:
Question 1 options:


We can start a reaction with different types of elements than we have at the end of the reaction.


We must start and end with the same amounts of matter


Matter cannot be created


Matter can be destroyed in a chemical reaction

Answer 1

Conservation of mass means:

• We must start and end with the same amount of matter

• Matter cannot be created

In a closed / isolated system, the total mass of the substance before the reaction will be equal to the total mass of the reaction product.

Further explanation

In general, the reaction takes place in the open air. If the reaction results in the form of gas as in combustion, the mass of the reaction results will be smaller than the original mass. Or if the reaction binds to a larger than the environment then the reaction results will produce a greater mass than the original mass.

For example, in a paper combustion reaction the mass of combustion ash is smaller than the mass of paper that is burned because there is a gas released into the air

Conservation of mass applies to a closed system, where the masses before and after the reaction are the same

Let see the answer choices :

• We can start a reaction with different types of elements than we have at the end of the reaction.

This statement is true, the elements in the reaction will also be found in the product, but in the form of other compounds

• Matter cannot be created

Matter cannot be created nor destroyed by chemical reactions

This statement is true, because matter only changes or is rearranged

• Matter can be destroyed in a chemical reaction

Incorrect statement

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Answer 2

Conservation of mass means:  b. We must start and end with the same amounts of matter and c. Matter cannot be created  and

Explanation:

The law of conservation of mass states that for any system that closed to all transfers matter and energy, the system mass must remain constant over time as the system's mass cannot change, so the quantity can neither be added nor be removed.

The law of conservation of mass means that matter cannot be created or destroyed, but it can change forms. Every chemical equation adheres to the law of conservation of mass which states that matter cannot be created or destroyed. According to the law of mass conservation, the product mass in a chemical reaction must be equal the mass of the reactants. The law of mass conservation states that in a closed system, the system mass cannot change over time.

Check all the statements that are correct. Conservation of mass means:

• a. We can start a reaction with different types of elements than we have at the end of the reaction.
• b. We must start and end with the same amounts of matter
• c. Matter cannot be created
• d. Matter can be destroyed in a chemical reaction

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