| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.98 |
| Score | 0% | 60% |
Water freezing or boiling is an example of which of the following?
phase transition |
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heating |
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sublimation |
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cooling |
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 substances gives up negatively charged hydroxide ions (OH-) when dissolved in water?
acid |
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hydrogen |
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ion |
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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.
Which of these is matter than cannot be separated into different types of matter by ordinary chemical methods?
element |
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atom |
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compound |
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molecule |
An element is matter than cannot be separated into different types of matter by ordinary chemical methods.
The Rh factor antigen in blood determines:
universal donor status |
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blood type |
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universal recipient status |
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postive or negative |
Blood is categorized into four different types (A, B, AB, and O) based on the type of antigens found on the outside of the red blood cells. Additionally, each type can be negative or positive based on whether or not the cells have an antigen called the Rh factor.
A major difference between sound waves and light waves is which of the following?
a sound wave cannot travel through a vacuum |
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a sound wave is mechanical while a light wave is electromagnetic |
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a sound wave is much slower than a light wave |
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all of these are correct |
A vibrating object produces a sound wave that travels outwardly from the object through a medium (any liquid or solid matter). The vibration disturbs the particles in the surrounding medium, those particles disturb the particules next to them, and so on, as the sound propagates away from the vibration.