Your answer is incorrect. The correct answer is D: "Even if the total number of atoms changes, mass may not be conserved in the reaction."
This is because in a chemical reaction, the atoms rearrange and form new compounds. The total number of atoms may change depending on the reaction, and as a result, the mass may also change. This can occur due to the formation or release of gases, changes in the state of matter, or other factors that can affect the mass of the system.
Which statement is true regarding a chemical reaction?
Even if the total number of atoms does not change, mass may not be conserved in the reaction.
A: Even if the total number of atoms does not change, mass may not be conserved in the reaction.
B: The total number of atoms does not change, so mass is conserved in the reaction.
C: The total number of atoms changes, so mass is conserved in the reaction.
D: Even if the total number of atoms changes, mass may not be conserved in the reaction.
My Answer is: B
11 answers
oh ok
No problem! Understanding the conservation of mass in chemical reactions can be a bit tricky, but it's an important concept in chemistry. If you have any more questions, feel free to ask!
So if a reaction forms a gas, that gas contains mass and escapes, causing mass to not be conserved?
Yes, that is correct! If a reaction produces a gas as one of the products and that gas escapes into the surroundings, then the mass of the system will appear to decrease. This is because the mass of the gas that is released is no longer part of the system being considered.
For example, when a piece of metal reacts with an acid to produce hydrogen gas, the hydrogen gas bubbles out of the solution and escapes into the air. Even though hydrogen gas has mass, the total mass of the system (the metal, the acid, and the resulting solution) decreases because the mass of the hydrogen gas is no longer included. Therefore, in such cases, the mass is not conserved.
For example, when a piece of metal reacts with an acid to produce hydrogen gas, the hydrogen gas bubbles out of the solution and escapes into the air. Even though hydrogen gas has mass, the total mass of the system (the metal, the acid, and the resulting solution) decreases because the mass of the hydrogen gas is no longer included. Therefore, in such cases, the mass is not conserved.
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