Question

match the term to whether it is endothermic or exothermic. * 6 points
endothermic exothermic
boiling
condensing
deposition
evaporating/vaporating
melting
sublimation
the law of conservation of mass states.... * 1 point
energy is neither lost nor gained in a reaction: it just changes
compounds are defined by their elements ratios
matter is neither lost nor gained in a reaction: it just changes
the same elements can form different compounds so long as the ratios are different

Explanation:

First Part (Phase Changes - Endothermic/Exothermic)

• Boiling: Correctly marked as Endothermic (needs heat to convert liquid to gas).
• Condensing: Exothermic (gas to liquid, releases heat).
• Deposition: Exothermic (gas to solid, releases heat; was incorrectly marked as Endothermic).
• Evaporating/Vaporating: Correctly marked as Endothermic (liquid to gas, needs heat).
• Melting: Endothermic (solid to liquid, needs heat; was unmarked).
• Sublimation: Endothermic (solid to gas, needs heat; was incorrectly marked as Exothermic).

Second Part (Law of Conservation of Mass)

The law of conservation of mass states that in a chemical reaction, matter (mass) is neither created nor destroyed—only rearranged.

• Option 1: Describes conservation of energy (not mass).
• Option 2: Describes definite proportions (not conservation of mass).
• Option 3: Correctly states matter is neither lost nor gained, just changed.
• Option 4: Describes multiple proportions (not conservation of mass).

Answer:

s:

Phase Changes (Correct Selections):

• Boiling: Endothermic (correct as marked).
• Condensing: Exothermic.
• Deposition: Exothermic.
• Evaporating/Vaporating: Endothermic (correct as marked).
• Melting: Endothermic.
• Sublimation: Endothermic.

Law of Conservation of Mass:

The correct option is:
C. matter is neither lost nor gained in a reaction: it just changes