Chapter 1, Problem 1.28E

The equation for the fermentation of glucose to alcohol and carbon dioxide is: C6H12O6(aq) 2C2H5OH(aq) + 2CO2(g) The enthalpy change for the reaction is 67 kJ. Is this reaction exothermic or endothermic? Is energy, in the form of heat, absorbed or evolved as the reaction occurs?

Nitrogen monoxide, a gas recently found to be involved in a wide range of biological processes, reacts with oxygen to give brown NO2 gas. 2 NO(g) + O2(g) NO2(g)rH = 114.1 kJ/mol-rxn Is this reaction endothermic or exothermic? What is the enthalpy change if 1.25 g of NO is converted completely to NO2?

How is the addition of heat symbolized in a chemical equation? The addition of light energy?

A 1753 kg1753 kg car is traveling down the road at 82.2 km/h.82.2 km/h. While traveling at this rate of speed, what is the kinetic energy of this vehicle in kilojoules?

For the reaction H2(g) + 1/2 O2(g) --> H2O(g), DHo = -241.8 kJ/mol. what mass of H2(g) in grams is required to liberate 1.00 x 103 kJ of heat?

Calculate the energy in joules of a 6.08 g object moving at a speed of 307 m/s.  Ek =   J

1. In what two ways can an object possess energy? How do these two ways differ from one another? 2. Suppose you toss a tennis ball upward.  (a) Does the kinetic energy of the ball increase or decrease as it moves higher? Explain your answer (b) Does the potential energy of the ball increase or decrease as it moves higher? Explain your answer (c) At what point does the potential energy of the ball reach a maximum? Explain your answers. 3. Classify the words below by placing them under their right types of energy. (Itis possible that one word can fall under more than one type.) a. batteries b. food c. solar d. ultraviolet rays e.lightning f.compass g.uranium h.microwaves i.ball held above the ground j.rubber band k.gunpowder

1. When a chemical reaction or a phase change occurs and energy is released to the surroundings then the reaction or process is said to be exothermic. True or false?   2. When a chemical reaction occurs the reaction usually either releases energy to the surroundings, or absorbs energy from the surroundings, but there are some reactions where there is no energy change. True or false?

The units of ku are mL (g−1·h−1) but the unit of ke is hour−1. Why?