| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.47 |
| Score | 0% | 69% |
Elements in the Periodic Table of the Elements are ordered by which of the following?
atomic weight |
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atomic mass |
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atomic number |
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number of electron shells |
The Periodic Table of the Elements categorizes elements primarily by the number of protons in their nucleus (atomic number) and secondarily by the characteristics they exhibit.
Which of the following is not a characteristic of the Sun?
makes up over 99% of the mass of the solar system |
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is composed of hydrogen and helium |
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formed 2.6 billion years ago |
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is a yellow dwarf star |
The Sun is a G-type main-sequence star (G2V) but is informally known as a yellow dwarf star. Composed of 73% hydrogen and 25% helium, the hot plasma that makes up the Sun reaches 9,900°F (5,505°C) at the surface. It formed approximately 4.6 billion years ago and makes up 99.86% of the mass in the solar system.
An endoskeleton (internal skeleton) is a charateristic of __________ animals, including humans.
sentient |
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spiny |
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vertebrate |
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arthropod |
An endoskeleton (internal skeleton) is a charateristic of vertebrate animals, including humans.
Which of the following states of matter exists at the highest temperature?
none of these |
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solid |
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liquid |
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gas |
Solids exist at a lower temperature than liquids which exist at a lower temperature than gases.
Which of the following is not true of light waves?
are electromagnetic waves |
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are mechanical waves |
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travel faster than sound waves |
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can travel through a vacuum |
Unlike mechanical sound waves that require a physical medium for propagation, light waves are electromagnetic and can travel through empty space. Light waves are also much faster, travelling at 186,000 m/s vs. 343 m/s for sound waves.