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Chemistry
Thermochemistry
| Question | Answer |
|---|---|
| What is exothermic? | Releasing energy from the substance to the surroundings |
| What is endothermic? | Absorbing energy from the surroundings to the substance |
| What is the equation for thermal energy? | J = Mass * Specific Heat * Changes in Temperature |
| What is the SI Unit for thermal Energy? | Joules |
| If an object's specific heat is higher, does it heats up quickly or slowly? | It heats up slowly |
| If an object's specific heat is lower, does it heats up quickly or slowly? | It heats up quickly |
| What is specific heat? | The amount of heat an object takes to raise the teperature of 1 gram of the substance 1 Celcius |
| What is the sign for exothermic reaction? | Negative |
| What is the sign for endothermic reaction? | Positive |
| If an object absorbs energy, does it becomes hotter or colder? | Hotter |
| If an object releases energy, does it becomes hotter or cooler? | Colder |
| What is the phase change from Solid to Liquid? | Melting |
| What is the phase change from Liquid to Gas? | Boiling/ Evaporation |
| What is the phase change (from Gas to Liquid) that occur when the mirror fogs up? | Condensation |
| What is the phase change from Gas to Solid? | Deposition |
| What is the phase change (Solid to Gas) that occurs when ice "disappears" in the freezer? | Sublimation |
| What is the boiling point for water? | 100 Celsius |
| What is the freezing point for water? | 0 Celsius |
| What is thermochemistry? | The study of heat changes that occur during chemical reaction and physical changes of state. |
| How do we find the change in teperature? | Final temp. - Intial temp. |
| How do you find the specific heat? | C = q/ m * changes of temperature |
| What is the unit for "q" ? | Heat energy |
| What is the unit for "m"? | Mass |
| What is the unit for change in temperature? | delta T |
| Where does boiling happen, in the water or on the surface of the water? | In the water |
| Where does evaporation happen, in the water or the surface of the water? | On the surface of the water |
| How does perspiration help cool your body? | The sweat takes away heat energy from your body, and evaporates |
| Is perspiration a phase of change? | No |
| What is the phase change (Liquid to Solid) that occurs when heat is removed from a liquid | Freezing |
| What is the phase change that keeps your body cool ? | Evaporation |
| Does condensation absorb or release energy? | Release energy |
| Is freezing endothermic or exothermic process? | Exothermic |
| Does melting absorbs or release energy? | Absorbs energy |
| Is boiling/ evaporation exotthermic or endothermic process? | Endtohermic |
Created by:
U0105006
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