2. After substance A was added to a beaker of water, the water temperature decreased. Which statement explains this phenomenon?
this process was exothermic and required hear from water substance was endothermic and required heat from water substance A caused the water to boil the water molecules moved faster none of the above
3. In an exothermic reaction
heat flows into the system heat flows into the surrounding heat flows into both the surrounding and system no heat is involved none of the above
4. 500mL of solution A at 23.0°C is mixed with 500mL of solution B in a bomb calorimeter. The final solution has a density of 2.0g/mL, final temperature of 26.3°C, and a specific heat capacity of 5.12 J/°C*g. What is the enthalpy change per mole of the final solution?
3.3 x 104 J 3.37 x 104 J 1.7 x 104 J 1.68 x 104 J 2.4 x 104 J
5. Which statement is TRUE?
calorimetry is the science of measuring heat molar heat capacity is the energy required to raise the temperature of one mole of substance by one kelvin specific heat capacity is the energy required to raise the temperature of one mole of substance one degree °C calorimetry experiments do not have to be performed at a constant volume all statements are false
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