Answer the following question given this paragraph: Metallic bonds are forces of attraction between positive metal ions and the valence electrons that are constantly moving around them (see the Figure below ). The valence electrons include their own and those of other, nearby ions of the same metal. The valence electrons of metals move freely in this way because metals have relatively low electronegativity, or attraction to electrons. The positive metal ions form a lattice-like structure held together by all the metallic bonds. For an animated version of metallic bonding, go to this URL:. Q: What kind of bonds are forces of attraction between positive metal ions and the valence electrons that are constantly moving around them? A:
OPTIONS:
- neutron bonds
- liquid bonds
- ionized bonds
- metallic bonds
metallic bonds
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Answer the following question given this paragraph: A pile of leaves slowly rots in the backyard. In the presence of oxygen, hydrogen can interact to make water. Gold can be stretched into very thin wires. Q: In the presence of oxygen, hydrogen can interact to make what? A:
OPTIONS:
- carbon
- helium
- acid
- water
water
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Answer the following question given this paragraph: Q: Centipedes have what on their foremost trunk segment, used to paralyze prey and aid in defense? A:
OPTIONS:
- board claws
- animal claws
- diploid claws
- poison claws
poison claws
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Answer the following question given this paragraph: Figure 27.11 The amplitudes of waves add. (a) Pure constructive interference is obtained when identical waves are in phase. (b) Pure destructive interference occurs when identical waves are exactly out of phase, or shifted by half a wavelength. Q: Pure constructive interference and pure destructive interference are distinguished by whether or not identical waves are what? A:
OPTIONS:
- before phase
- in equilibrium
- after phase
- in phase
in phase
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