| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.42 |
| Score | 0% | 68% |
Water freezing or boiling is an example of which of the following?
cooling |
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heating |
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sublimation |
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phase transition |
A substance undergoes a phase transition when it moves from one state of matter to another, for example, when water freezes or boils.
Which of the following does not filter air as part of the respiratory system?
nasal cavity |
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epiglottis |
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trachea |
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pharynx |
After air enters through the nose, it passes through the nasal cavity which filters, moistens, and warms it. Further filtering takes place in the pharynx, which also helps protect against infection, and then in the trachea which is just past the epiglottis which prevents food from entering the airway.
pH is a scale that measures of how basic or acidic a solution is. A solution with a pH of 9 is:
alkaline |
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acidic |
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neutral |
|
water |
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.
Which of the following is not a method of heat transfer?
reflection |
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convection |
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radiation |
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conduction |
Heat is always transferred from warmer to cooler environments through conduction, convection, or radiation.
Minerals, vitamins, and fiber are:
carbohydrates |
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proteins |
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macronutrients |
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micronutrients |
Minterals, vitamins, and fiber are micronutrients while proteins, carbohydrates, and fats are macronutrients.