18. Which of the following does not have an lonic bond? A) BaC B) Na2O C) CS2 D)

Question

18. Which of the following does not have an lonic bond? A) BaC B) Na2O C) CS2 D) BaS 19. What types of compounds are salts, such as sodium chloride? A) Ionic compounds B) Covalent compounds C) Polar covalent compounds D) All of the above 20. What kind of bond has unequal sharing of bonding electrons? A) Polar covalent B) Covalent C) Ionic D) Polar ionic 21. The energy released during the formation of an ionic bond is onic energy Heat of formation Activation energY D) Heat of creation 22. Assume you know the position vectors of a particle at two points on its path, one earlier and one later. You also know the time it took the particle to move from one point to the other. What will you be able to compute from the particle?. A) Avg velocity B) Avg acceleration C) Instantaneous velocity D) Instantaneous acceleration 23. What is an electrostatic attraction between positive and negative ions called? A) ionic bond B) metallic bond c) covalent bond D) electrostatic bond 24. Atoms attempt to acquire an outer orbital with eight electrons is a statement of the... A) Heisenberg uncertainty principle B) Atomic theory c) Octet rule D) Chemical energy balancing rule 25. An 80 kg man on ice skates is pushing his 40 kg son, also on skates, with a force of 100 N. together, they move across the ice steadily gaining speed. The force exerted by the boy on his father is A) True B) False 26. A projectile is fired at 35° above the horizontal. At the hi int in its trajectory, its speed is 20 m/s. The initial velocity along the x-axis woul A) Equal to 20 m/s B) Greater than 20 m/s C) Less than 20 m/s

Explanation / Answer

Answer:18 : It's easiest to identify an ionic bond by determining if the atoms are metals or nonmetals. If the bond is between a metal and a nonmetal, then the bond is ionic. If the bond is between two nonmetals, then the compound is covalent. Barium is found on the left side of the periodic table, so it is a metal. Chlorine is found on the right side of the periodic table, so it is a nonmetal. So, BaCl2 is an ionic compound. So, answer is NaO2. Answer: 19 : Answer A Answer:20 : D Answer: 21 : it is actually lattice energy, or heat of creation. Answer: 22 : A Answer: 23 : D Answer: 24 : C

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