Calorimetry Worksheet 2 Answers Chemsheets [RECOMMENDED]

. Only use the mass of the liquid solution, as the solid does not significantly contribute to the heat capacity. Excess zinc powder is added to . The temperature increases by Solution: Find mass ( ): Only the solution volume matters Calculate : Calculate moles of CuSO4CuSO sub 4 : Calculate : Type 3: Combustion Reactions (Using a Spirit Burner)

ΔH=−qn×1000cap delta cap H equals negative the fraction with numerator q and denominator n cross 1000 end-fraction = Enthalpy change, measured in . = Heat energy in Joules (J) .

). Crucial note: In solution-based reactions, assume the density of the aqueous solution is calorimetry worksheet 2 answers chemsheets

) for combustion, neutralisation, and displacement reactions. Brentford School for Girls Core Methodology & Formulas

Mass of the solution/water (often assumed to have a density of Specific heat capacity (usually for water/aqueous solutions). cap delta cap T Change in temperature ( Calculate moles ( (for solids) or (for solutions). Determine Enthalpy Change ( cap delta cap H (result usually converted from Brentford School for Girls The temperature increases by Solution: Find mass (

On Worksheet 2, you’ll usually face:

: Combustion is always exothermic , so your final ΔHcap delta cap H must be negative . Crucial note: In solution-based reactions

This uses the principle that heat lost = heat gained .

Since the system is perfectly insulated, the heat lost is equal in magnitude but opposite in sign to the heat gained. Therefore: [ q_metal = -q_water ] [ (500.0)(0.385)(T_f - 60.0) = -(200.0)(4.184)(T_f - 22.0) ] [ 192.5(T_f - 60.0) = -836.8(T_f - 22.0) ] [ 192.5T_f - 11550 = -836.8T_f + 18409.6 ] [ 192.5T_f + 836.8T_f = 18409.6 + 11550 ] [ 1029.3T_f = 29959.6 ] [ T_f = \boxed29.1 °C ]