following is a correct Lewis structure for nitrous acid‚ HNO2? 3. The central atom in PH3 is surrounded by a) three single bonds and no lone pairs of electrons. b) three single bonds and one lone pair of electrons. c) three single bonds and two lone pairs of electrons. d) two single bonds‚ one double bond‚ and no lone pairs of electrons. e) two single bonds‚ one double bond‚ and one lone pair of electrons. 4. One resonance structure for OCN- ion is drawn below. What is the formal charge on each
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Biology Exam Review Unit One – Biochemistry What is an isotope? Isotope - An isotope is all atoms of the same element that have the same number of protons‚ but they may have different numbers of neutrons in the nucleus. - This means that all atoms with the same atomic number can have different atomic masses. - Because they have the same number of protons and electrons‚ they behave exactly the same in chemical reactions. Radioisotope - The nuclei of some isotopes of an element are unstable
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Definitions of a. element b. compound c. trace elements d. isotope e. ion f. isomer (don’t get d‚ e and f mixed up) g. proton h. neutron i. electron 3. Understand how covalent bonds form and the difference between polar covalent and non-polar covalent 4. How does an ionic bond form? 5. What is a H bond and know an example. 6. About chemical reactions: a. What is a chemical reaction? b. Reactants c. Products 7. The polar nature of water gives it extraordinary characteristics”
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| | | | | * Question 6 10 out of 10 points | | | How many O atoms are there in 51.4 g CaSO4?Answer | | | | | Selected Answer: | 9.09 × 1023 | | | | | * Question 7 10 out of 10 points | | | How many covalent bonds will a nitrogen atom usually form?Answer | | | | | Selected Answer: | 3 | | | | | * Question 8 10 out of 10 points | | | How many grams of Cl2 can be prepared from the reaction of 16.0 g of MnO2 and 30.0 g of HCl according
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Introduction and Chemistry of Life Anatomy: the study of structure or shape of body parts and their relationship to each other. Physiology: the study of function (how the parts work) Levels of structural organization: There is a hierarchy of structural complexity‚ beginning with the simplest or chemical level and culminating with the highest level-the whole organism Chemical level – atoms (and their parts)‚ and combinations of atoms called molecures Cellular level – cells are the basic structural
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BIO EXAM 1 BUILDING BLOCKS Aminoacids->Proteins->Enzymes Glucose=Polysaccrides Glyseral=Fat Molecule Neoclotides= DNA & RNA CRITERIA OF LIFE: (5) A. Biology: What is it?: BIOLOGY: is the scientific study of life B. What is life? -- Criteria for life: All living organisms have similar properties -composed of cells made up of macromolecules -growth‚ development & reproduction -heritable information in the form of DNA -sensitivity to stimuli -homeostasis (maintenance of internal environment)
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of an atom based on the atomic number and to predict the number of covalent and or ionic bonds that the atom will form based on the atomic number. -electron shells-3 shells (2-8-18) -Electron Orbital-2 electrons can fit into an orbital 5- Be able to distinguish covalent‚ ionic‚ hydrogen and hydrophobic bonds on the basis of structure and strength. -Covalent-When unpaired electrons are shared by elements. Creates a Strong bond. -Ionic-When electrons are transferred from one atom to another.
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Human Physiology ZOOL 2404 Instructor: Dr. Gollahon Copyright © 2009 Pearson Education‚ Inc.‚ publishing as Pearson Benjamin Cummings Introduction Chapters 1 and 2 Study strategies crucial for success Attend all lectures‚ labs‚ and study sessions Read your lecture notes and text materials before listening to the audio or watching the video lectures Devote a block of time each day to your Physiology course Set up a study schedule and stick to it Do not procrastinate!
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1. Question : Richard was observing black swallowtail butterflies in the field. Which one of these is an observation he made about a black swallowtail butterfly? The black swallowtail laid its eggs on a parsley plant. Question 2. Question : The most valid and reliable test of the hypothesis‚ more pine seeds germinate after a forest fire‚ would include an experimental group of pine seeds that was recovered from a fire area and pine seeds that were — tolerant of fire. Question 3
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Chemistry Exam Review Matter and Chemical Bonding Significant Digits All non zero integers are significant ~ 456cm All zeros to the left of the first non zero digit are not significant~ 0.005kg All zeros between non zero digits are significant~ 207.08 km All zeros at the end of a number that has a decimal point are significant ~ 34.070 mg Density Density is a physical property of matter‚ as each element and compound has a unique density associated with it. Density defined in a qualitative
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