Science Starters What is the difference between TEMPERATURE and HEAT?

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Presentation transcript:

Science Starters What is the difference between TEMPERATURE and HEAT? 8/4/2019

Science Starters 8/4/2019 How much heat is absorbed by 320 mL of water when its temperature is raised from 20. C to 55 C?

Science Starters 8/4/2019 If 100. mL of water in a calorimeter increases 10.0 C when Mg reacts with HCl, then what is the heat of reaction (qrxn)?

Science Starters Calculate the H for: 2Al + Fe2O3 2Fe + Al2O3 Given that, 2Al + (3/2)O2  Al2O3 H = -1670 kJ 2Fe + (3/2)O2 Fe2O3 H = -824 kJ 8/4/2019

IR thermometer activity: Do you think the temperatures of different surfaces in the room will be different? If not, why not? If so, which types of surfaces will be cool, warm, etc? Hypothesis: 8/4/2019

Science Starters Write the chemical equation representing the heat of combustion of candle wax, C20H42 (Hint the moles of wax in the equation must be equal to one even if this means your coefficients are not all whole numbers) 8/4/2019

Science Starters 8/4/2019 What must be the sign of H and S if a reaction is said to be spontaneous at any temperature?

8/4/2019

Science Starters 8/4/2019 Find H for the reaction below: H2(g) + ½ O2(g)  H2O(l)

Science Starters 8/4/2019 What is the accepted value for the heat of fusion of ice (water)?