| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.88 |
| Score | 0% | 58% |
Which of the following substances gives up positively charged hydrogen ions (H+) when dissolved in water?
alkaline |
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acid |
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solution |
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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.
Elements that belong to the same period in the Periodic Table of the Elements have the same number of:
protons |
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electrons |
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atomic mass units |
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electron shells |
The rows of the Periodic Table are called periods and contain elements that have the same number of electron shells ordered from lower to higher atomic number.
Force is measured in newtons (N) with 1 N being the force required to impart an acceleration of:
1 m/s2 to a mass of 1 kg |
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1 mph to a mass of 1 kg |
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1 m/s to a mass of 1 kg |
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1 m/s2 to a mass of 1 kg/s2 |
Weight is a force that describes the attraction of gravity on an object. Force is measured in newtons (N) with 1 N being the force required to impart an acceleration of 1 m/s2 to a mass of 1 kg.
Food is mixed with gastric acid and pepsin in the __________ to help break down protein.
mouth |
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small intestine |
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large intestine |
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stomach |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.
The angle of reflection is equal to which the following?
focal point |
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refractive index |
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angle of incidence |
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90° |
The law of reflection specifies how waves, including light waves, bounce off of surfaces. Specifically, the angle of incidence of the approaching wave is equal to the angle of reflection of the reflected wave as measured from a line perpendicular (90°) to the surface.