HELP ASAP!!
1. A student cuts some fabric into two pieces. Is this change physical or chemical?
A.) It is a chemical change because there is no phase change
B.) It is a physical change because there is no reaction
C.) It is a chemical change because the size changes
D.) It is a physical change because the process is reversible

2. How are chemical changes different from physical changes?
A.) They form new substances
B.) They are reversible
C.) They involve heat
D.) They include shifts in the phase of matter

3. A scientist makes several observations about a chemical reaction and records them in the table shown. Which observation contains an error based on Law of Conservation of Mass?
A.)3
B.)2
C.)4
D.)1

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

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

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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