Clarify the “fireplace triangle” and the importance of every element within the combustion course of. (1 level) Decision The hearth triangle, also called the combustion triangle, consists of three parts that serve to ignite and keep a hearth. Warmth, gasoline, and oxygen are the three constituents of a hearth triangle. Warmth-Through the combustion course of, warmth is produced to help within the transformation of oxidizer and gasoline into exhaust product. The oxidizer within the combustion course of is the gasoline. The method happens when a gasoline has a quick response with oxygen and emits warmth. Oxygen- When gasoline is burnt, oxygen mixes with the hydrogen and carbon to generate water and carbon dioxide, so producing warmth. Clarify in your individual phrases what “Activation Vitality” means. Which of two polymers with distinct activation energies can be easier to ignite? Make clear why (1 Mark) Answer The activation power is the minimal quantity of power required to provoke a chemical response. The activation power (Ea) is measured in joules per mole (j/mol) for a selected course of. On this occasion, the 2 distinct polymers are polyamide 6 and polyurethane. The activation energies of the 2 polymers differ such that polyamide 6 has 106.2kJ.mol-1 and is simpler to ignite as a result of its activation power is the minimal for chemical reactions, whereas polyurethane has 129.6kJ.mol-1 and isn’t comparatively simpler to ignite as a result of its activation power isn’t the minimal for chemical reactions. If the Warmth of Combustion of Benzene (C6H6) is 4.25MJ per mole, then how a lot warmth might be produced if 250g of Benzene is burned with an effectivity of 80%? Show your strategies. (2 Marks) Answer Warmth of Combustion Equals MassSepeif Warmth (Warmth of Combustion)/mass equals Particular Warmth (4.25MJ1000)/250g = 17KJ Query 2 (4 Marks) Clarify the connection between the “Thermal Diffusivity” of a brick and the temperature measured on the heated facet of a brick wall in your individual phrases. (1 Mark) Answer Thermal diffusivity is the thermal conductivity of a brick divided by its density and particular warmth capability below fixed stress. It measures the speed of warmth switch from the nice and cozy facet to the chilly facet of a brick. It’s denoted by the SI unit of m2/s. Calculate the speed of convective warmth switch by a 250 mm thick concrete slab when the underside is uncovered to 600 °C and the highest is at ambient situations. The place the encircling temperature is 200C. (1 Mark) Answer ((T h-T c))/x =(6000 C-200 C=5800 C) (2505800 C)/(5800 C)=250J Conductive warmth switch price equals 250 J/mm2 Clarify the “fireplace triangle” and the importance of every element within the combustion course of. (1 Mark) Answer The hearth triangle, also called the combustion triangle, consists of three parts that serve to ignite and keep a hearth. Warmth, gasoline, and oxygen are the three constituents of a hearth triangle. Warmth-Through the combustion course of, warmth is produced to help within the transformation of oxidizer and gasoline into exhaust product. The oxidizer within the combustion course of is the gasoline. The method happens when a gasoline has a quick response with oxygen and emits warmth. Oxygen- When gasoline is burnt, oxygen mixes with the hydrogen and carbon to generate water and carbon dioxide, so producing warmth. Clarify in your individual phrases what “Activation Vitality” means. Which of two polymers with distinct activation energies can be easier to ignite? Make clear why (1 Mark) Answer The activation power is the minimal quantity of power required to provoke a chemical response. The activation power (Ea) is measured in joules per mole (j/mol) for a selected course of. On this occasion, the 2 distinct polymers are polyamide 6 and polyurethane.
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