1. Let\'s say you hold some ice in your hand. The ice melts and your hand feels

Question

1. Let's say you hold some ice in your hand. The ice melts and your hand feels cold. The reaction of H2O(s) H2O(l) is ___________(endothermic/exothermic?). The change in enthalpy of the reaction is ___________ (poisitve/negative?)

2. When 0.105 mol propane, C3H8 is burned in an excess of oxygen, how many moles of oxygen are consumed? The products are carbon dioxide and water. You have to properly balance the equation before you can answer this question. Which answer is correct?

a) 0.420 mol O2

b) 0.875 mol O2

c) 0.905 mol O2

d) 0.975 mol O2

e) 0.525 mol O2

3. The enthalpy of solution is defined as Hsoln=Hsolute+Hsolvent+Hmix. Each of the terms on the right side of the equation are either endothermic or exothermic. Which answer properly depicts this.

a) Endothermic, Endothermic, Exothermic

b) Exothermic, Endothermic, Endothermic

c) Endothermic, Exothermic, Endothermic

d) Exothermic, Exothermic, Endothermic

e) Endothermic, Endothermic, Endothermic

4. What is the process by which a solute forms a solution in a solvent?

a) neutralization

b) delineation

c) dissolution

d) bumping

e) calisthenics

Explanation / Answer

1. endothermic , poisitve

2.   C3H8 + 5O2 ----> 3CO2 + 4H2O

no of mol of O2 = 0.105*5 = 0.525 mol O2

answer: e) 0.525 mol O2

3. e) Endothermic, Endothermic, Endothermic

4. c) dissolution

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