Oil is spilled into the ocean. What do you expect will happen?
A. Most of the oil will form bonds with the water molecules to form new covalently bonded structures.
B. Most of the oil will quickly disperse and mix in with water and form hydrogen bonds.
C. The hydrogen and oxygen atoms within the oil will become water.
D. Water molecules will absorb the oil molecules and break them apart.
E. Most of the oil molecules will clump and exclude water.
Answer: E
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Isotopes of an element have
A. the same atomic number and same atomic weight. B. the same atomic number but different atomic weights. C. different atomic numbers and different atomic weights. D. different atomic numbers but the same atomic weight.
The lens of the eye thickens when the
A. ciliary muscles relax. B. ciliary processes relax. C. ciliary muscles contract. D. suspensory ligaments pull on the lens capsule.
Puberty is initiated when a region of the brain begins secreting
A. luteinizing hormone. B. estrogen or testosterone. C. follicle-stimulating hormone. D. gonadotropin-releasing hormone. E. androgens.
This figure shows the muscles of facial expression. What muscle does number 7 indicate?
A. Depressor labii inferioris B. Mentalis C. Sternocleidomastoid D. Levator labii superioris E. Risorius