Honors Chemistry - Chapter 16 Energy

How much energy must be used to produce 4.75 mol of gaseous water?
H₂O (l) +  44.0 kJ --> H₂O (g)

• 209 kJ
• 9.36 kJ
• 209.0 kJ
• 9.362 kJ

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During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______.

• Warm

• Cold

• Bubbly

• Damp

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What type of reaction is the following?
6 CO₂ +6 H₂O --> C₆H₁₂O₆ + 6 O₂ + 114 kcal

• exothermic
• endothermic

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Calculate ΔH when 4.72 g of carbon reacts with excess oxygen, according to the following equation?
C + O₂ → CO₂ 
ΔH = -393.5 kJ

• -154.8 kJ
• -95.0 kJ
• -66.7 kJ
• -199.5 kJ

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H₂ + Cl₂ --> 2 HCl + 1845 kJ
Is this reaction endothermic or exothermic?

• Endothermic 
• Exothermic

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ΔH value in an endothermic reaction is a positive number.

• True
• False

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The SI unit of heat and energy is the __________.

• calorie
• heat
• joule
• watt

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Which direction does energy flow?

• from hot to cold
• from cold to hot
• from lower kinetic energy to higher kinetic energy 
• every direction

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What is the specific heat of an unknown substance if 100.0 g of it at 200.0 °C reaches an equilibrium temperature of 27.1 °C when it comes in contact with a calorimeter of water.  The water weighs 75. g and had an initial temperature of 20.00 °C?  (Specific heat of water is 4.18 J/g°C) (show your work)

• 0.111 J/g°C
• 1.29 J/g°C
• 0.129 J/g°C
• 22225.85 J

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Calorimetry Question:
A piece of metal with a mass of 32.8 g is heated to 100.5°C and dropped into 138.2 g of water at 20.0°C.  The final temperature of the system is 30.2°C.  What is the specific heat capacity of the metal? (show your work)

• 2.56 J/g°C
• 0.391 J/g°C
• 5.29 J/g°C
• 3.50 J/g°C

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