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Essential Chemistry for Biology

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Essential Chemistry for Biology Chapter 2 1. There are 92 naturally occurring elements on Earth. What is an element? substances that cannot be broken down 2. Four of the elements oxygen, carbon, hydrogen and nitrogen make up about 96% of the weight of the human body. Oxygen is the most abundant element in the body. 3. Trace elements are required in very small amounts, but we cannot live without them. 4. Why is the trace element iodine important in the body? essential for hormone produced by thyroid gland 5. Why is the trace element fluoride important in the body? needed component of healthy bones and teeth 6. Know the chemical element for each of the following symbols: C; carbon H; hydrogen O; oxygen

AP Biology Campbell Chapter 2 Objectives

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Elements and Compounds Distinguish between an element and a compound. Identify the four elements that make up 96% of living matter. Define the term trace element and give an example. Atoms and Molecules Draw and label a simplified model of an atom. Explain how this model simplifies our understanding of atomic structure. Distinguish between each of the following pairs of terms: neutron and proton atomic number and mass number atomic weight and mass number Explain how the atomic number and mass number of an atom can be used to determine the number of neutrons. Explain how two isotopes of an element are similar. Explain how they are different. Describe two biological applications that use radioactive isotopes.

Chemistry Section 5.2 Notes

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Section 5.2: Electron Configuration and the Periodic Table Periods and Blocks of the Periodic Table: Elements arranged vertically in groups/family with similar properties Elements in horizontal rows (period) w/ similar chemical properties Length of period = number of electrons occupying sublevels being filled in that period Periodic Table divided into 4 blocks: s,p,d,f Name of each block determined by whether an s,p,d, or f sublevel is being filled in successive elements of that block Period of element determined from element?s electron configuration Aresnic: [Ar]3d104s24p3 4 in 4p3 indicates arsenic?s highest occupied energy level is 4 The s-Block Elements: Groups 1 and 2: Elements of s block are chemically reactive metals (Grp1 more reactive)

Chemistry Section 5.2 Notes

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chemistry 5.2 notes

Section 5.2: Electron Configuration and the Periodic Table Periods and Blocks of the Periodic Table: Elements arranged vertically in groups/family with similar properties Elements in horizontal rows (period) w/ similar chemical properties Length of period = number of electrons occupying sublevels being filled in that period Periodic Table divided into 4 blocks: s,p,d,f Name of each block determined by whether an s,p,d, or f sublevel is being filled in successive elements of that block Period of element determined from element?s electron configuration Aresnic: [Ar]3d104s24p3 4 in 4p3 indicates arsenic?s highest occupied energy level is 4 The s-Block Elements: Groups 1 and 2: Elements of s block are chemically reactive metals (Grp1 more reactive)

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Pg.71 20) The difference between a message and a method is that a method is when a message is sent to an object. 21)double nextDouble()- returns a double entered by the user at the keyboard, and void println (double n)- Writes N to the print stream. Pg.73 22.a) Valid 22.b) Valid 22.c) Invalid 22.d) Invalid 22.e) Valid 23.a) diameterOfACircleIsX 23.b) xIsStandardDeductionForIncomeTeaxReturn 23.c) methodDrawsRectangle Pg.74 24) In the statement "import x.y.z;", X is the overall name of the package, Y is the name of a subsection within the package, and Z is the name of a particular class in the subsection.

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Pg.71 20) The difference between a message and a method is that a method is when a message is sent to an object. 21)double nextDouble()- returns a double entered by the user at the keyboard, and void println (double n)- Writes N to the print stream. Pg.73 22.a) Valid 22.b) Valid 22.c) Invalid 22.d) Invalid 22.e) Valid 23.a) diameterOfACircleIsX 23.b) xIsStandardDeductionForIncomeTeaxReturn 23.c) methodDrawsRectangle Pg.74 24) In the statement "import x.y.z;", X is the overall name of the package, Y is the name of a subsection within the package, and Z is the name of a particular class in the subsection.

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