Respuesta :
Answer:
The correct answer is A, B, and D.
Explanation:
To answer this question, let's recall the definitions and characteristics of physical and chemical changes.
A physical change is when the chemical composition and identity of a substance is not changed. However, other aspects, such as size, shape, and state of matter, may be changed. Examples of physical changes include ripping a piece of paper in half and melting ice to make water.
On the other hand, a chemical change is a reaction where new substances are formed. Chemical changes are irreversible and involve changing the identity of the substances involved. Examples of chemical changes are rusting of metal and burning wood in a fire.
Using these definitions, let's now examine each of the answer choices.
A) Copper turning green on exposure to air is a chemical change, because turning green (color change) indicates a chemical change as does creation of a new substance (in this case, oxidized copper).
B) This is a chemical change because a new substance is produced. In this case, it is the gas produced with the bubbling.
C) Liquid water freezing into ice is a physical change because this involves a change of state. The identity of the molecules is not changing and no new substances are formed, so this cannot be a chemical reaction.
D) This is a chemical change, because there are new substances formed, and the identity of the substances in the reaction are changing (as evidenced by the color change and formation of a new gas).
Therefore, the correct answers are A, B, and D.
Check out these other questions on Brainly for more information about chemical reactions:
https://brainly.com/question/13316655
https://brainly.com/question/42765796
