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 1 and 2 1 and 2 2 and 3 2 and 3 2 and 4 2 and 4 1 and 4 1 and 4 Skip to navigation

Answer 1

To determine which changes are physical changes, we need to analyze the criteria given in the table:

• Reacts with another substance?: Chemical change if "yes."
• Temperature change?: Chemical change if "yes."
• Gas, sound, or light produced?: Chemical change if "yes."
• New substance formed?: Chemical change if "yes."

From this, we can conclude:

• Change 1: Reacts (yes), temperature change (yes), gas/sound/light produced (yes), new substance formed (yes) → Chemical change.
• Change 2: Does not react (no), temperature change (yes), gas/sound/light produced (yes), new substance formed (no) → Physical change (since there is no reaction and no new substance formed).
• Change 3: Reacts (yes), temperature change (yes), gas/sound/light produced (yes), new substance formed (yes) → Chemical change.
• Change 4: Does not react (no), no temperature change (no), no gas/sound/light produced (no), no new substance formed (no) → Physical change (neither a reaction nor new substance).

Based on this analysis, the changes that are physical changes are 2 and 4. Therefore, the correct response is:

2 and 4.