(a)
Interpretation:
State true or false for the following statement: Heat of reaction is the heat given off or absorbed by a
Concept Introduction:
The heat given off or absorbed in a chemical reaction is known as heat of reaction.
(b)
Interpretation:
State true or false for the following statement: An endothermic reaction is one that gives off heat.
Concept Introduction:
An endothermic reaction is the reaction which absorb heat.
(c)
Interpretation:
State true or false for the following statement: If a chemical reaction is endothermic, the reverse reaction is exothermic.
Concept Introduction:
A reaction that gives off heat is called exothermic reaction and the reaction that absorb heat is called endothermic reaction.
(d)
Interpretation:
State true or false for the following statement: All combustion reactions are exothermic.
Concept Introduction:
A combustion reaction is the reaction that occurs when a substance reacts with oxygen, releasing energy in the form of heat and light.
(e)
Interpretation:
State true or false for the following statement: If the reaction of glucose (
Concept Introduction:
A reaction that gives off heat is called exothermic reaction and the reaction that absorb heat is called endothermic reaction.
(f)
Interpretation:
State true or false for the following statement: The energy required to drive photosynthesis comes from the sun in the form of
Concept Introduction:
Photosynthesis is the process plants use the energy from sunlight to produce glucose from carbon dioxide and water.
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INTRO.TO GENERAL,ORGAN...-OWLV2 ACCESS
- The carbon dioxide exhaled in the breath of astronauts is often removed from the spacecraft by reaction with lithium hydroxide 2LiOH(s)+CO2(g)Li2CO3(s)+H2O(l) Estimate the grams of lithium hydroxide required per astronaut per day. Assume that each astronaut requires 2.50 103 kcal of energy per day. Further assume that this energy can be equated to the heat of combustion of a quantity of glucose, C6H12O6, to CO2(g) and H2O(l). From the amount of glucose required to give 2.50 103 kcal of heat, calculate the amount of CO2 produced and hence the amount of LiOH required. The H for glucose(s) is 1273 kJ/mol.arrow_forwardWhen one mole of ethylene gas, C2H4, reacts with fluorine gas, hydrogen fluoride and carbon tetrafluoride gases are formed and 2496.7 kJ of heat are given off. What is Hf for CF4(g)?arrow_forwardGraphite is burned in oxygen to give carbon monoxide and carbon dioxide. If the product mixture is 33% CO and 67% CO2 by mass, what is the heat from the combustion of 1.00 g of graphite?arrow_forward
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- Although the gas used in an oxyacetylene torch (Figure 5.7) is essentially pure acetylene, the heat produced by combustion of one mole of acetylene in such a torch is likely not equal to the enthalpy of combustion of acetylene listed in Table 5.2. Considering the conditions for which the tabulated data are reported, suggest an explanation.arrow_forwardEthanol, C2H5OH, is a gasoline additive that can be produced by fermentation of glucose. C6H12O62C2H5OH+2CO2 (a) Calculate the mass (g) of ethanol produced by the fermentation of 1.000 lb glucose. (b) Gasohol is a mixture of 10.00 mL ethanol per 90.00 mL gasoline. Calculate the mass (in g) of glucose required to produce the ethanol in 1.00 gal gasohol. Density of ethanol = 0.785 g/mL. (c) By 2022, the U. S. Energy Independence and Security Act calls for annual production of 3.6 1010 gal of ethanol, no more than 40% of it produced by fermentation of corn. Fermentation of 1 ton (2.2 103 lb) of corn yields approximately 106 gal of ethanol. The average corn yield in the United States is about 2.1 105 lb per 1.0 105 m2. Calculate the acreage (in m2) required to raise corn solely for ethanol production in 2022 in the United States.arrow_forwardIs the Sun exothermic or endothermic? Is it any less exothermic or endothermic in the winter, as opposed to the summer?arrow_forward
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