| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.31 |
| Score | 0% | 66% |
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.
Which of the following is the correct order for types of radiation from lowest to highest frequency?
infrared waves → microwaves → ultraviolet light |
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visible light → ultraviolet light → radio waves |
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microwaves → radio waves → visible light |
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radio waves → visible light → gamma rays |
The electromagnetic spectrum covers all possible wavelengths and frequencies of radiation. From lowest frequency (longest wavelength) to highest frequency (shortest wavelength) radiation: radio waves → microwaves → infrared waves → visible light → ultraviolet light → X-rays → gamma rays.
Which of the following is not a method of heat transfer?
radiation |
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reflection |
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convection |
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conduction |
Heat is always transferred from warmer to cooler environments through conduction, convection, or radiation.
What prevents blood pumped out of the ventricles from flowing back into the heart?
valves |
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platelets |
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atria |
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capillaries |
The heart is the organ that drives the circulatory system. In humans, it consists of four chambers with two that collect blood called atria and two that pump blood called ventricles. The heart's valves prevent blood pumped out of the ventricles from flowing back into the heart.
Food is mixed with gastric acid and pepsin in the __________ to help break down protein.
small intestine |
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mouth |
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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.