An atomic nucleus can be described by the analogy “like a marble in the Dallas Cowboys Stadium.” If a marble represents the atomic nucleus, what does the stadium represent?
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An atomic nucleus can be described by the analogy “like a marble in the Dallas Cowboys Stadium.” If a marble represents the atomic nucleus, what does the stadium represent?
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- which of the sub-atomic particles is commonly represented by this symbol:"e-"?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)Where’s the nucleus located in an atom?
- Alchemists were medieval scholars and philosophers who were the forerunners of modern-day chemists. Many spent their lives trying to transform lead (atomic number 82) into gold (atomic number 79). Explain why they never succeeded.What if there are a different number of Neutrons? Sometimes elements have a different number of neutrons than usual, so therefore have a different atomic mass. This is what we call an Isotope (a variant form of an element which has the same number of protons but a differing number of neutrons). Sometimes we’ll see Isotopes labeled with their new mass like this: 14C = this is Carbon 14. Notice it has a different mass than what is on your periodic table The average mass of all the isotopes is defined as an element’s Atomic Weight. Can you answer questions about these Isotopes? ELEMENT ATOMIC MASS NUMBER OF PROTONS NUMBER OF NEUTRONS 14C A B C 15N D E F 2H G H I Use your table to look up the number of protons, remember that never changes!Atoms A and B interact to form a compound, AB2. When measured, atom A has a partial negative charge and atom B has a partial positive charge. From this information, we can conclude what? Select only ONE answer choice. Note: - means "approximately equal to" , A > B means "A is greater than B" , and A B: AB2 is hydrophilic Not enough information to answer the question
- Nitrogen is an isotope of nitrogen that has 7 protons and 3 neutrons.What are the atomic atom and atomic mass number of nitrogen 11 here is the picture here.You have discovered a new molecule in outer space. You have never seen this type of molecule before on Earth. You analyze the composition and discover that it is made of 28% carbon atoms, 24% oxygen atoms, and 48% hydrogen atoms. You immediately decide that it is not an alien protein or an alien nucleotide. Explain why you know that the molecule cannot be a protein or a nucleotide. Do you think that the molecule is an alien fatty acid or an alien carbohydrate? Explain your decision Will your molecule be hydrophilic or hydrophobic? Explain your answer considering polarity and electronegativityMany radioactive isotopes are used in medicine for imaging and treatment purposes. The specific isotopes used depends on the particular organ or body system being studied (for example, Xe-133 is used to image lung function and blood flow.) Technetium-99m is a common radioactive isotope using for a variety of medical applications. It is produced from the decay of Molybdenum-99 and has a half-life of 6.01 hours. What are some of the applications of Tc-99m? While harder to access, another radioactive isotope of technetium, Tc-93, has a half-life of 2.73 hours. If it were easier to harvest, would this be a good substitute for Tc-99m? (remember to explain why for full credit) While Tc-99m has a half-life of 6.01 hours, its decay product has a half-life of 213,000 years. While the medical community considers it to be reasonably safe, within the limits of testing, does this make sense considering both chemical and biological principles? What are possible ways that you might deal with or…
- Often, complex molecules are described in terms of their atomic masses. But what is more relevant in biology is how they take up space. (For proteins, their shapes are particularly important.) Let's see if we can get an approximate idea of the physical size of a protein molecule by doing various estimations. An important molecule in the internal mechanisms of cells is Actin. This is measured as having a mass of about 42 kDa (= 42,000 Daltons, where 12 Daltons is defined as the mass of a carbon atom). Let's see if we can estimate how big it is using very crude estimates. Of course eventually we will want to know how big it actually is and what its shape is, but getting a scale would help us determine what measurement tools might be appropriate. In order to estimate the size of Actin, we'll first make an estimate of how many atoms it has, then, using the average size of an atom, we'll consider different models of how it might be arranged to get an idea of its size. A. We could look up…A molecule with the chemical formula C6H12O6 is probably aWhat kind of biological molecule is this?