| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.64 |
| Score | 0% | 73% |
An air mass is a large body of air that has which of the following characteristics?
similar temperature |
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similar density |
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all of these |
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similar moisture |
An air mass is a large body of air that has similar moisture (density) and temperature characteristics. A front is a transition zone between two air masses.
Changes to an object's speed or direction of motion are caused by which of the following?
work |
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a force |
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kinetic energy |
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power |
Force is applied to change an object's speed or direction of motion.
The energy posessed by a thrown baseball is an example of what kind of energy?
transitional |
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gravitational |
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potential |
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kinetic |
Kinetic energy is the energy posessed by a moving object. Potential energy is stored energy in a stationary object based on its location, position, shape, or state.
A transition zone between two air masses is called:
fog |
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front |
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boundary |
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thunderstorm |
An air mass is a large body of air that has similar moisture (density) and temperature characteristics. A front is a transition zone between two air masses.
Which of the following substances gives up positively charged hydrogen ions (H+) when dissolved in water?
acid |
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base |
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solution |
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alkaline |
An acid is a substance that gives up positively charged hydrogen ions (H+) when dissolved in water. A base (alkaline) gives up negatively charged hydroxide ions (OH-) when dissolved in water. pH is a scale that measures of how basic or acidic a solution is. Numbered from 0 to 14, solutions with a pH of 7 are neutral, less than 7 are acidic, more than 7 are alkaline.