Question

1. which of the following is not an example of an arthropod? (a) crab (b) centipede (c) sea urchin (d) spider 22. table salt is considered a(n) (a) ionic compound (b) semi - ionic compound (c) covalent compound (d) element 23. over the course of 24 hours (a) the earth rotates 360 degrees around the sun (b) the moon rotates 360 degrees around the earth (c) the earth rotates 360 degrees about its axis (d) the moon rotates 360 degrees about its axis

Explanation:

• For question 21: Arthropods have joint - ed appendages, exoskeletons, and segmented bodies. Crabs, centipedes, and spiders are arthropods. Sea urchins are echinoderms.
• For question 22: Table salt (sodium chloride, NaCl) is formed by the transfer of an electron from sodium to chlorine, creating ions that are held together by ionic bonds, making it an ionic compound.
• For question 23: The Earth rotates 360 degrees about its axis in approximately 24 hours, which gives us day and night.

Answer:

1. C. sea urchin
2. A. ionic compound
3. C. the Earth rotates 360 degrees about its axis