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- In general, what physical properties can be used to distinguish one substance from one another, based on their appearance?Several substances found in nature or within living organisms themselves are essential to the life. Thus, for each of the following substances, please give a concrete example briefly describing how their properties make them essential to life. A) Acid (pH below 7) B) LipidFor hydrogen bonds, answer these three questions: A) Are they found in polar, non-polar or both types of molecules? B) Are they strong or weak? C) Are they found inside a molecule or between a molecule?
- According to chemist John Dalton, if one mole of nitrogen is combined with three moles of hydrogen to form one mole of ammonia (knowing that nitrogen, with an atomic number of 7, has an atomic mass of 14, and hydrogen, with an atomic number of 1, has an atomic mass of 1), then this compound will have an atomic weight (or molecular mass) of: 14 grams per mole (14 daltons) 17 grams per mole (17 daltons) 20 grams per mole (20 daltons) 22 grams per mole (22 daltons) 43 grams per mole (43 daltons)Many consumer products are almost identical in chemical composition but are sold under different brand names and at varying prices. Should some medical drugs be identified by their chemical (generic) names or trade names? Why?Explain why snow is not a pure element. What is the composition of snow? Describe its solid phase and interactions between other particles of snow through intermolecular attractions.
- Which of the following is true of thymine and uracil? A Thymine has a methyl group at C-5 and Uracil at C-4. uracil has a methyl group at C-5 but thymine does not. (c) Both have a methyl group at C-5, D) Thymine has a methyl group at C-5 but uracil does not.Which of the following types of bonds are not involved in maintaining the tertiary structure of proteins? A) Hydrogen Bonds B) Disulfide Bonds C) Ionic Bonds D) Peptide BondsWhat characteristics of carbon make possible the existence of so many different organic compounds?
