Thermal Energy Equation Q = m times C times Delta T Q = change in thermal energy

Question

Thermal Energy Equation Q = m times C times Delta T Q = change in thermal energy m = mass of substance Delta T = change in temperature C = specific heat of substance Wave Equation c = lambda v c = the speed of light (3.1 times 10^8 m/s) lambda = wavelength (m) v = frequency (s^-1) or (Hz) Energy of Light Equation E = h times v E = Energy h = Plank's Constant (6.63 times 10^-14 J middot s) v = frequency (s^-8) or (Hz) When hydrogen and oxygen are combined in air, heat and light are given off. In terms of the energetic of this reaction, it may be classified as __________. A) exothermic B) endothermic C) thermodynamic D) kinetic E) potential In the decomposition of Calcium Carbonate (CaCO_3) to form Calcium Oxide (CaO) and Carbon Dioxide (CO_2)556 kiloJoules of energy are absorbed. In terms of the energetic of this reaction, it may be classified as ___________ CaCO_3(s) + 556 kJ rightarrow CaO(s) + CO_2(g) A) exothermic B) endothermic C) thermodynamic D) kinetic E) potential

Explanation / Answer

If heat is given off in a reaction then it is exothermic

if heat is absorbed in a reaction then it is endothermic

So in first question energy in form of heat and light is released

1) (a) exothermic

In the second reaction heat is absorbed by reaction

2) (b) endothermic

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