According to the Law of Conservation of Mass, the total mass of the products and the total mass of the reactant in a chemical reaction are the same
The correct options are;
- 1. B.) It is a physical change because there is no reaction
- 2. A.) They form new substances
Reason:
1. Physical change is a change in which there is no change in the chemical properties of the substances involved
Therefore, the change is a physical change because there is no reaction
The correct option is option A.)
B.) <u>It is a physical change because there is no reaction</u>
2. A difference between a chemical change and a physical change is that a new substance is formed following chemical change while no new substance is formed in a physical change
Therefore, the correct option is option A.)
A.) <u>They form new substances</u>
3. The Law of Conservation of Mass states that mass can neither be created or destroyed in a closed system
Based on the Law of Conservation of Mass, the observation that contains an error is observation #1
![\begin{array}{|c|c|c|}\mathbf{Observation} &\mathbf{Before \ Reaction}&\mathbf{During /After \ Reaction}\\&&\\1&Mass = 30 \ g&Mass = 42 \ g\end{array}](https://tex.z-dn.net/?f=%5Cbegin%7Barray%7D%7B%7Cc%7Cc%7Cc%7C%7D%5Cmathbf%7BObservation%7D%20%20%26%5Cmathbf%7BBefore%20%5C%20Reaction%7D%26%5Cmathbf%7BDuring%20%2FAfter%20%5C%20Reaction%7D%5C%5C%26%26%5C%5C1%26Mass%20%3D%2030%20%5C%20g%26Mass%20%3D%2042%20%5C%20g%5Cend%7Barray%7D)
From the given data, the mass of the items in the system change from <u>30 grams</u> to <u>42 grams</u>, which is an error based on Law of Conservation of Mass
The option that gives the observation that contains an error is option D.)
D.) <u>1</u>
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