Look at the graph below and identify the following: Is this endothermic or exothermic? Activation energy? Enthalpy of the reactants? Enthalpy of the products?

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Presentation transcript:

Look at the graph below and identify the following: Is this endothermic or exothermic? Activation energy? Enthalpy of the reactants? Enthalpy of the products? Change in enthalpy (ΔH)?

What are the formulae for: Melting. Water getting warmer. Vaporization What are the formulae for: Melting? Water getting warmer? Vaporization? Condensation? Ice warming? Gas increasing temperature?

If it takes 15J to vaporize 1 gram of a substance, how much heat must be applied to vaporize 20 grams?

Draw the setup for the candle lab

Compound A is burned in a bomb calorimeter that contains 2 Compound A is burned in a bomb calorimeter that contains 2.50 liters of water. If the combustion of 0.175 moles of this compound causes the temperature of the water to rise 45.0 °C, what is the molar heat of combustion of compound A?

What temperature change will result from the addition of 3 What temperature change will result from the addition of 3.22 x 103 joules of heat to 35.0 grams of water?

How many joules are needed to warm 675 grams of water from 12 How many joules are needed to warm 675 grams of water from 12.0°C to 85.0°C?

The specific heat of iron is 0. 448 J/g°C The specific heat of iron is 0.448 J/g°C. What will be the final temperature if 3.50 x 104 joules of heat are added to a 454 gram sample of iron at 24.0°C

c(ice) = 2. 06 J/gC, c(H2O) = 4. 2 J/gC c(steam) = 1 c(ice) = 2.06 J/gC, c(H2O) = 4.2 J/gC c(steam) = 1.87 J/gC, H(fuse) for H2O is 334 J/g H(vap) for H2O is 2260 J/g

Look at the graph below and identify the following: Is this endothermic or exothermic? Activation energy = 80 kJ/mol Enthalpy of the reactants = 20 kJ/mol Enthalpy of the products = 50 kJ/mol Change in enthalpy (ΔH) = 30 kJ/mol

What are the formulae for: Melting: Q = mHfuse Water getting warmer: Q = mcΔT Vaporization: Q = mHvap Condensation: Q = mHfuse Ice warming: Q = mHfuse Gas increasing temperature: Q = mHfuse

If it takes 15J to vaporize 1 gram of a substance, how much heat must be applied to vaporize 20 grams? 15J = xJ xJ = 300 J 1 g 20 g

Draw the setup for the candle lab

Compound A is burned in a bomb calorimeter that contains 2 Compound A is burned in a bomb calorimeter that contains 2.50 liters of water. If the combustion of 0.175 moles of this compound causes the temperature of the water to rise 45.0 °C, what is the molar heat of combustion of compound A? Q = mcΔT Q = (2500)(4.2)(45) Q = 472,500 J 0.175 mol Q = 2,700,000 J

What temperature change will result from the addition of 3 What temperature change will result from the addition of 3.22 x 103 joules of heat to 35.0 grams of water? Q = mcΔT 3,220 J = (35)(4.2)(ΔT) ΔT = 3,220 J (35)(4.2) ΔT = 21.9 °C

How many joules are needed to warm 675 grams of water from 12 How many joules are needed to warm 675 grams of water from 12.0°C to 85.0°C? Q = mcΔT Q = (675)(4.2)(73) Q = 206,955 J

The specific heat of iron is 0. 448 J/g°C The specific heat of iron is 0.448 J/g°C. What will be the final temperature if 3.50 x 104 joules of heat are added to a 454 gram sample of iron at 24.0°C Q = mcΔT 35,000 = (454)(0.448)(ΔT) ΔT = 35,000 J (454)(0.448) ΔT = 172.08 °C Final temp = 196.08 °C