Which of the following can be considered evidence of a chemical change? (Click the 4 that apply)
A) Production of Bubbles***
B) Color Change***
C) Heat is Released
D) Freezing
E) Melting
F) Evaporation
G) Dissolving***
H) Production of a new Substance***
Am I correct?
3 out of 4
dissolving is a physical change
... dissolve salt in water ... evaporate water ... still have salt (unchanged)
HINT ... chemical changes usually involve energy
I feel like the rest of the answers would be physical changes, but would it be " heat is released " ?
yes, heat is released
Yes, you are correct. The four options that can be considered evidence of a chemical change are:
A) Production of Bubbles: This indicates the release of a gas, which can be a result of a chemical reaction.
B) Color Change: A change in color can indicate the formation of new substances resulting from a chemical reaction.
G) Dissolving: When a substance dissolves, its particles separate and become dispersed throughout a solvent. This can be an indicator of chemical change.
H) Production of a new Substance: If a new substance is formed, it is a clear indication of a chemical change taking place.
To determine the correct answers, you can use your knowledge of chemical reactions. In this case, you can eliminate options that are physical changes, like freezing, melting, and evaporation, as they do not involve the formation of new substances. Heat release can be a result of either a physical or a chemical change, so it is not enough to solely determine a chemical change. By understanding the characteristics of chemical changes, such as the production of bubbles, color change, dissolution, and the formation of new substances, you can identify the correct options that indicate a chemical change.