QQuestionChemistry
QuestionChemistry
Determine whether each described process is endothermic or exothermic.
a. Ice melts into liquid water
b. A process with a calculated positive q.
c. Wood burns in a fireplace.
d. A process with a calculated negative q.
e. Acid and base are mixed, making the test tube feel hot.
f. Solid dissolves into solution, making the ice pack feel cold.
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Answer
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Step 1:I'll solve this problem step by step, following the specified LaTeX formatting guidelines:
Step 2:: Ice melts into liquid water
- Final determination: $$\text{Endothermic process}
- This is an endothermic process - Explanation: Melting requires energy input to break the hydrogen bonds in the solid ice crystal structure - The system absorbs heat from the surroundings to overcome the intermolecular forces
Step 3:: A process with a calculated positive q
- Final determination: $$\text{Endothermic process}
- This means energy is being added to the system from the surroundings
Step 4:: Wood burns in a fireplace
- Final determination: $$\text{Exothermic process}
- This is an exothermic process - Explanation: Combustion releases heat to the surroundings - Chemical bonds in the wood break, producing heat and light
Step 5:: A process with a calculated negative q
- Final determination: $$\text{Exothermic process}
- This means energy is being transferred from the system to the surroundings
Step 6:: Acid and base are mixed, making the test tube feel hot
- Final determination: $$\text{Exothermic process}
- This is an exothermic process - Neutralization reactions typically release heat - The temperature increase indicates heat transfer to the surroundings
Step 7:: Solid dissolves into solution, making the ice pack feel cold
- Final determination: $$\text{Endothermic process}
- This is an endothermic process - Dissolution requires energy to break intermolecular bonds in the solid - The temperature decrease indicates heat absorption from the surroundings
Final Answer
a. Ice melting: \text{Endothermic} b. Positive q: \text{Endothermic} c. Wood burning: \text{Exothermic} d. Negative q: \text{Exothermic} e. Acid-base mixing: \text{Exothermic} f. Solid dissolving: \text{Endothermic}
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