| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.01 |
| Score | 0% | 60% |
In the metric system, what prefix represents 10-3?
kilo |
|
milli |
|
mega |
|
centi |
In the metric system, milli is the prefix for 10-3.
Convert 5C° to F°.
41 |
|
37 |
|
27 |
|
-23 |
To convert from C° to F° use:
\(F° = {9 \over 5}C° + 32\)
\(F° = {9 \over 5}(5) + 32\)
\(F° = {45 \over 5} + 32\)
\(F° = 9 + 32 = 41\)
The energy posessed by a ball on the window ledge of a tall building is an example of what kind of energy?
inherent |
|
potential |
|
gravitational |
|
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.
As a cold front moves into an area, the heavier cool air __________ the lighter warm air that it is replacing.
pushes under |
|
cancels out |
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pushes above |
|
mixes with |
A cold front is a warm-cold air boundary with the colder air replacing the warmer. As a cold front moves into an area, the heavier cool air pushes under the lighter warm air that it is replacing. The warm air becomes cooler as it rises and, if the rising air is humid enough, the water vapor it contains will condense into clouds and precipitation may fall.
Which of the following substances gives up positively charged hydrogen ions (H+) when dissolved in water?
alkaline |
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acid |
|
solution |
|
base |
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.