| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.21 |
| Score | 0% | 64% |
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/s2 |
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1 m/s to a mass of 1 kg |
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1 mph to a mass of 1 kg |
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1 m/s2 to a mass of 1 kg |
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.
Which of the following is not a terrestrial planet?
Earth |
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Mercury |
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Venus |
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Jupiter |
The four planets closest to the Sun (Mercury, Venus, Earth, and Mars) are called terrestrial (Earth-like) planets because, like the Earth, they're solid with inner metal cores covered by rocky surfaces.
Which of the following substances gives up positively charged hydrogen ions (H+) when dissolved in water?
solution |
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acid |
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base |
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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.
The rows of the Periodic Table of the Elements are called:
groups |
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shells |
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periods |
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families |
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.