Answer the following question given this paragraph: A whole molecule may also have a separation of charge, depending on its molecular structure and the polarity of each of its bonds. If such a charge separation exists, the molecule is said to be a polar molecule (or dipole); otherwise the molecule is said to be nonpolar. The dipole moment measures the extent of net charge separation in the molecule as a whole. We determine the dipole moment by adding the bond moments in three-dimensional space, taking into account the molecular structure. For diatomic molecules, there is only one bond, so its bond dipole moment determines the molecular polarity. Homonuclear diatomic molecules such as Br2 and N2 have no difference in electronegativity, so their dipole moment is zero. For heteronuclear molecules such as CO, there is a small dipole moment. For HF, there is a larger dipole moment because there is a larger difference in electronegativity. When a molecule contains more than one bond, the geometry must be taken into account. If the bonds in a molecule are arranged such that their bond moments cancel (vector sum equals zero), then the molecule is nonpolar. This is the situation in CO2 (Figure 7.27). Each of the bonds is polar, but the molecule as a whole is nonpolar. From the Lewis structure, and using VSEPR theory, we determine that the CO2 molecule is linear with polar C=O bonds on opposite sides of the carbon atom. The bond moments cancel because they are pointed in opposite directions. In the case of the water molecule (Figure 7.27), the Lewis structure again shows that there are two bonds to a central atom, and the electronegativity difference again shows that each of these bonds has a nonzero bond moment. In this case, however,. Q: Why do homonuclear diatomic molecules have zero dipole moment? Choices: - no electrical attraction - no activation energy - at homeostasis - no difference in electronegativity A:
no difference in electronegativity
Answer the following question given this paragraph: Ponds are small water bodies often fed by springs. Q: Small water bodies often fed by springs are called what? Choices: - puddles - rivers - oceans - ponds A:
ponds
Q: Answer the following question given this paragraph: In many ways, humans are unique among mammals. For example, we have bigger brains and a greater ability to learn than any other species in the mammalian class. In many ways, however, we are typical of the mammalian order to which we belong. That order is the Primate Order. To fully understand what it means to be human, you need to know more about this fascinating order of mammals. Q: What mammalian class has the greatest ability to learn? Choices: - apes - reptiles - rats - humans A:
A: humans
Question: Answer the following question given this paragraph: Passive immunity arises from the transfer of antibodies to an individual without requiring them to mount their own active immune response. Naturally acquired passive immunity is seen during fetal development. IgG is transferred from the maternal circulation to the fetus via the placenta, protecting the fetus from infection and protecting the newborn for the first few months of its life. As already stated, a newborn benefits from the IgA antibodies it obtains from milk during breastfeeding. The fetus and newborn thus benefit from the immunological memory of the mother to the pathogens to which she has been exposed. In medicine, artificially acquired passive immunity usually involves injections of immunoglobulins, taken from animals previously exposed to a specific pathogen. This treatment is a fast-acting method of temporarily protecting an individual who was possibly exposed to a pathogen. The downside to both types of passive immunity is the lack of the development of immunological memory. Once the antibodies are transferred, they are effective for only a limited time before they degrade. Q: Passive immunity arises from the transfer of what to an individual, without requiring them to mount their own active immune response? Choices: - parasites - bacteria - viruses - antibodies A:
Answer: antibodies
*Question*
Answer the following question given this paragraph: Even if you don't live in a place where leaves turn color in the fall, no doubt you've seen photos of their "fall colors" (see Figure below ). The leaves of many plants turn from green to other, glorious colors during autumn each year. The change is triggered by shorter days and cooler temperatures. Leaves respond to these environmental stimuli by producing less chlorophyll . This allows other leaf pigmentssuch as oranges and yellowsto be seen. Q: When plants lose their leaves in the fall, what chemical is produced less to cause the change? Choices: - pheromes - carbonate - oxygen - chlorophyll A:
**Answer**
chlorophyll
Q: Answer the following question given this paragraph: Observational learning is learning by watching and copying the behavior of someone else. Human children learn many behaviors this way. When you were a young child, you may have learned how to tie your shoes by watching your dad tie his shoes. More recently, you may have learned how to dance by watching a pop star dancing on TV. Most likely, you have learned how to do math problems by watching your teachers do problems on the board at school. Can you think of other behaviors you have learned by watching and copying other people?. Q: What is the term for learning by watching and copying the behavior of someone else? Choices: - consequential learning - associative learning - classical conditioning - observational learning A:
A: observational learning