Subjects
| Sections | |||
|---|---|---|---|
| Internal Energy | 22 mins | 0 completed | Learn |
| Calorimetry | 39 mins | 0 completed | Learn |
| Thermochemical Equation | 6 mins | 0 completed | Learn Summary |
| Hess's Law | 17 mins | 0 completed | Learn |
| Enthalpy of Formation | 13 mins | 0 completed | Learn Summary |
| End of Chapter 6 Problems | 52 mins | 0 completed | Learn |
| Additional Practice |
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| Units of Energy |
| Additional Guides |
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| Endothermic & Exothermic Reactions |
| Enthalpy |
Determine whether the sign of E is positive or negative for the system.
a. A rolling billiard ball collides with another billiard ball. The first billiard ball (defined as the system) stops rolling after the collision.
b. A book falls to the floor. (The book is the system).
c. A father pushes his daughter on a swing. (The daughter and the swing are the system).