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Chem Unit #1 Exam
| Question | Answer |
|---|---|
| When you touch a piece of ice with your finger, energy flows: | from your finger to the ice |
| Object A cools more quickly than Object B. How do their specific heats compare? | Object B has a higher specific heat |
| The volume of a gas is increased while its temperature is held constant. The gas exerts a lower pressure on the walls of its container because its molecules strike the walls: | less often |
| On the molecular level, heat is: | kinetic energy |
| Pressure is the relationship between: | force and area |
| Compared to a giant iceberg, a hot cup of coffee has: | higher temperature, but less thermal energy |
| Is CO2 changing from a solid to gas exothermic or endothermic? | endothermic |
| Is water freezing endothermic or exothermic? | exothermic |
| Is charging a battery exothermic or endothermic? | endothermic |
| Is burning paper endothermic or exothermic? | exothermic |
| Is liquid nitrogen evaporating endothermic or exothermic? | endothermic |
| Is turning dough into bread endothermic or exothermic? | endothermic |
| Exothermic reactions = reactants or products have more energy? | reactants |
| Endothermic reactions = reactants or products have more energy? | products |
| If the same quantity of heat is added to both a 2-liter and a 4-liter container of water, the temperature change for the water in the 4-liter container will be: | half that of the 2-liter container |
| Pour a liter of 40C water into a liter of 20C water and the final temperature of the two liters becomes: | at or about 30C |
| Place a 1-kg iron block at 40C into 1kg of water at 20C and the final temperature becomes: | less than 30C |
| In a sealed jar, the temperature of a gas doubles. By how much does the pressure change? | the pressure will double as well |
| An oven set to bake bread or cookies usually would be at about what temperature? | 175C |
| How does the size of Kelvin degree compare to the size of Celsius degree? | they are the same, just change the zero point |
| People would usually start wearing a winter coat when the temperature gets down to which of the following? | 10C |
| If you want to heat a metal plate to as high a temperature as possible for a given energy input, which metal would be the best choice for the plate? | copper (better than iron or aluminum) |
| Rank processes from least amount of energy required to most amount of energy required: 0C ice -> 0C liquid, 0C liquid -> 100C liquid, 100C liquid -> 100C steam | 0C ice -> 0C liquid, 0C liquid -> 100C liquid, 100C liquid -> 100C steam |
| Which of the following would be considered a physical property? | corrosion resistance, oxygen sensitivity, flammability, density, reactivity towards acid |
| If you measure the volume, pressure, and temperature of a sample of pure gas, what else can you determine about it? How? | how many moles you have/amount of gas "n" |
| Which of the following would be typical temperature on a summer day? | 300K |
| What is the difference between the Kelvin and Celsius temperature scales? | Celsius temperature scale has negative numbers while the Kelvin temperature scale does not |
| The temperature of a balloon is kept the same, but the pressure drops to 1/3 its original value. What else changes and by how much? | the volume changes; it increases 3x |
| What is the difference between heat and temperature? | heat is adding thermal energy while temperature is the measure of the direction that thermal energy is transferred in |
| A substance with a lower heat capacity takes ____________ energy to heat than a substance with a higher heat capacity. | less |
| Gasoline being used in the engine of a car producing exhaust is an example of what kind of change? | chemical |
| Which of the following is NOT considered a chemical property? exploding, rusting, dissolving in acid, light sensitivity, or boiling temp | boiling temperatrue |
| What is the boiling point of water in Kelvin degrees? | 373K |
| Heat of vaporization can be thought of as a change in what kind of energy? | potential energy |
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