Answer the following question given this paragraph: Magnetic Moments of Molecules and Ions Experimental evidence of magnetic measurements supports the theory of high- and low-spin complexes. Remember that molecules such as O2 that contain unpaired electrons are paramagnetic. Paramagnetic substances are attracted to magnetic fields. Many transition metal complexes have unpaired electrons and hence are paramagnetic. Molecules such as N2 and ions such as Na+ and [Fe(CN)6]4 that contain no unpaired electrons are diamagnetic. Diamagnetic substances have a slight tendency to be repelled by magnetic fields. When an electron in an atom or ion is unpaired, the magnetic moment due to its spin makes the entire atom or ion paramagnetic. The size of the magnetic moment of a system containing unpaired electrons is related directly to the number of such electrons: the greater the number of unpaired electrons, the larger the magnetic moment. Therefore, the observed magnetic moment is used to determine the number of unpaired electrons present. The measured magnetic moment of low-spin d6 [Fe(CN)6]4 confirms that iron is diamagnetic, whereas high-spin d6 [Fe(H2O)6]2+ has four unpaired electrons with a magnetic moment that confirms this arrangement. Q: As the number of unpaired electrons increases, what happens to the magnetic moment? Choices: - is destroyed - remains the same - gets smaller - gets larger A:
gets larger
(Question)
Answer the following question given this paragraph: Q: Does climate change have a positive or negative effect on reproductive success? Choices: - neither - positive - both - negative A:
(Answer)
negative
Ques: Answer the following question given this paragraph: osmol = M i If more than one solute is present in a solution, the individual osmolarities are additive to get the total osmolarity of the solution. Solutions that have the same osmolarity have the same osmotic pressure. If solutions of differing osmolarities are present on opposite sides of a semipermeable membrane, solvent will transfer from the lower-osmolarity solution to the higher-osmolarity solution. Counterpressure exerted on the highosmolarity solution will reduce or halt the solvent transfer. An even higher pressure can be exerted to force solvent from the high-osmolarity solution to the low-osmolarity solution, a process called reverse osmosis. Reverse osmosis is used to make potable water from saltwater where sources of fresh water are scarce. Q: If solutions of differing osmolarities are present on opposite sides of a semipermeable membrane, solvent will transfer from what to what, in terms of osmolarity of the solution? Choices: - low to low - high to high - high to low - low to high A:
Ans: low to high
(Q).
Answer the following question given this paragraph: The placenta allows nutrients and wastes to be exchanged between the mother and fetus. The fetus is connected to the placenta through the umbilical cord. Q: What connects the fetus to the placenta? Choices: - womb - fallopian tube - amniotic sac - umbilical cord A:
(A).
umbilical cord
Ques:Answer the following question given this paragraph: Q: What helps screen libraries for a gene of interest using nucleic acid hybridization? Choices: - mitochondrial acid probe - cellular acid probe - proteins acid probe - nucleic acid probe A:

Ans:nucleic acid probe
Ques:Answer the following question given this paragraph: The solubility of a substance is the amount of that substance that is required to form a saturated solution in a given amount of solvent at a specified temperature. Solubility is often measured as the grams of solute per 100 g of solvent. The solubility of sodium chloride in water is 36.0 g per 100 g water at 20C. The temperature must be specified because solubility varies with temperature. For gases, the pressure must also be specified. Solubility is specific for a particular solvent. We will consider solubility of material in water as solvent. Q: What term means the amount of a substance required to form a saturated solution in a given amount of solvent at a specified temperature? Choices: - viscosity - concentration - turbidity - solubility A:

Ans:
solubility