Use the table of observed changes to answer the question. Change # Reacts with another substance? Temperature change? Gas, sound, or light produced? New substance formed? 1 yes yes yes yes 2 no yes yes no 3 yes yes yes yes 4 no no no no Which changes shown in the table are physical changes? (1 point) Responses 2 and 4 2 and 4 2 and 3 2 and 3 1 and 4 1 and 4 1 and 2
The physical changes shown in the table are changes 2 and 4.
The changes shown in the table that are physical changes are changes 2 and 4.
To determine which changes shown in the table are physical changes, we need to understand the characteristics of physical changes.
Physical changes are changes that do not result in the formation of a new substance. They involve alterations in the physical properties of the substance, such as shape, size, or state, without changing its chemical composition.
Looking at the table, we can identify physical changes by examining whether a new substance is formed during each change. A "yes" in the "New substance formed?" column indicates a chemical change, whereas a "no" indicates a physical change.
Based on this criteria, we can evaluate each change:
1. Change #1: It reacts with another substance, produces a temperature change, and generates gas, sound, or light. Additionally, a new substance is formed (as indicated by "yes" in the "New substance formed?" column). Therefore, Change #1 is a chemical change, not a physical change.
2. Change #2: It does not react with another substance and produces gas, sound, or light. However, no new substance is formed as indicated by "no" in the "New substance formed?" column. Therefore, Change #2 is a physical change.
3. Change #3: It reacts with another substance, produces a temperature change, and generates gas, sound, or light. A new substance is also formed (as indicated by "yes" in the "New substance formed?" column). Therefore, Change #3 is a chemical change.
4. Change #4: It does not react with another substance, does not produce a temperature change, and does not generate gas, sound, or light. Furthermore, no new substance is formed (as indicated by "no" in the "New substance formed?" column). Therefore, Change #4 is a physical change.
Based on the analysis above, changes #2 and #4 are physical changes. Therefore, the correct answer is "2 and 4" - which matches option "2 and 4" in the provided responses.