Question

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Answer 1

Answer:

1.C

2.B

3.1

Explanation:

1.It's a chemical change since the size of the fabric changes

2.Chemical changes involves heat,forms new substance and involves a change in the mass or matter of a substance but it isn't easily reversible.

3.In the law of Conservation of mass matter can neither be created or destroyed.Therefor there won't be a change in the mass under ordinary reaction.

Answer 2

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

• 3. D.) 1

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.) It is a physical change because there is no reaction

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.) They form new substances

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

$\begin{array}{|c|c|c|}\mathbf{Observation} &\mathbf{Before \ Reaction}&\mathbf{During /After \ Reaction}\\&&\\1&Mass = 30 \ g&Mass = 42 \ g\end{array}$

From the given data, the mass of the items in the system change from 30 grams to 42 grams, 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.) 1

Learn more about the Law of Conservation of Mass, chemical and physical changes here:

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