| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.86 |
| Score | 0% | 57% |
Meteoroids, meteors and meteorites are categorized based on which of the following?
their temperature |
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their location |
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their size |
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their density |
Smaller rocks shed by asteroids and comets are called meteoroids. When these rocks reach Earth's atmosphere, they burn up in the mesosphere and become meteors. If a meteor manages to reach the Earth, it is called a meteorite.
pH is a scale that measures of how basic or acidic a solution is. A solution with a pH of 4 is:
acidic |
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neutral |
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basic |
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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.
Molecules and atoms that are outputs from a chemical reaction are known as which of the following?
reactants |
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side effects |
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results |
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products |
During a chemical reaction molecules and atoms (reactants) are rearranged into new combinations that result in new kinds of atoms or molecules (products).
In the metric system, what prefix represents 10-3?
kilo |
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centi |
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mega |
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milli |
In the metric system, milli is the prefix for 10-3.
During digestion, after proteins are broken down where does the undigested food go next?
esophagus |
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stomach |
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small intestine |
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large intestine |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.