Ques: Q: What is the term for the use of two or more lewis structures to represent the covalent bonding in a molecule? Read this paragraph and choose the correct option from the provided answers: Resonance is the use of two or more Lewis structures to represent the covalent bonding in a molecule. One of the valid structures is referred to as a resonance structure. It is now understood that the true structure of a molecule which displays resonance is that of an average or a hybrid of all the resonance structures. In the case of the O 3 molecule, each of the covalent bonds between O atoms is best thought of as being "one and a half" bonds, as opposed to either a pure single bond or a pure double bond. This "half-bond" can be shown as a dotted line in both the Lewis structure and the molecular model (see Figure below ). Choices: - reaction - harmony - frequency - resonance A:
Ans: resonance

Ques: Q: When does the diploid zygote form? Read this paragraph and choose the correct option from the provided answers: Chapter 26 1 Figure 26.8 B. The diploid zygote forms after the pollen tube has finished forming, so that the male generative nuclei can fuse with the female gametophyte. 3 D 5 C 7 A 9 B 11 C 13 B 15 C 17 D 19 Both pollination and herbivory contributed to diversity, with plants needing to attract some insects and repel others. 21 The trees are adapted to arid weather, and do not lose as much water due to transpiration as non-conifers. 23 The resemblance between cycads and palm trees is only superficial. Cycads are gymnosperms and do not bear flowers or fruit. Cycads produce cones: large, female cones that produce naked seeds, and smaller male cones on separate plants. Palms do not. 25 Using animal pollinators promotes cross-pollination and increases genetic diversity. The odds that the pollen will reach another flower are greatly increased compared with the randomness of wind pollination. Choices: - never - before the pollen tube - before the haploid zygote - after the pollen tube A:
Ans: after the pollen tube

Ques: Q: What occurs when hot magma transforms rock that it contacts? Read this paragraph and choose the correct option from the provided answers: Contact metamorphism occurs when hot magma transforms rock that it contacts. Choices: - existence metamorphism - form metamorphism - changing metamorphism - contact metamorphism A:
Ans: contact metamorphism

Ques: Q: The periodic table of elements is divided into what? Read this paragraph and choose the correct option from the provided answers: Each element has its own square in the periodic table. The square contains the chemical symbol for the element, the atomic number, and the atomic weight . The atomic weight of an element is a weighted average of its isotopes. Choices: - patterns - spheres - groups - squares A:
Ans:
squares