17. Copper, Cu, is used in many facets of the roofing and building construction industries. Leading producers of this metal are Chile, United States, Canada, Zambia, and Zaire. To find how many moles of copper is in 1.07 × 1024 atoms of copper, you should

A divide the number of Cu atoms by 6.02 × 1023 particles per mol.

B subtract the number of Cu atoms by 6.02 × 1023 particles per mol.

C add the number of Cu atoms by 6.02 × 1023 particles per mol.

D multiply the number of Cu atoms by 6.02 × 1023 particles per mol.

the tides are influenced by both the moon and the sun, it's easy to see that when the sun lines up with the moon and the earth, as during a new moon or full moon, the tidal effect is increased. these are known as spring tides, named not for the season, but for the fact that the water "springs" higher than normal. on the other hand, if the sun and the moon are 90 degrees apart in relation to an observer on earth as during the first quarter moon or third quarter moon, then high tides are not as high as they normally would be. this is because despite its greater distance, the sun's mass allows it to exert enough gravitational force on the oceans that it can negate some of the effects of the moon's pull. this phenomenon of lower high tides is called a neap tide. if you need more information on this topic visit moonconnection.com.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

there are two significant figures.