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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Impact on your side Log on to www.topperlearning.com 2 6. Type of Solid Molecular solids 1. Non polar 2. Polar 3. Hydrogen bonded Ionic solids Ions Dipole-dipole interactions Hydrogen bonding Coulombic or electrostatic HCl‚ solid SO2‚ solid NH3 H2O (ice) Soft Hard Insulator Insulator Low Low Types of crystalline solids: Constituen t Particles Molecules Bonding/ Attractive Forces Dispersion or London forces
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or any ionic compound conduct electricity and nonelectrolytes do not conduct electricity. An Ionic compound is formed from the electrical attraction between anions and cations‚ typically a metal with a non-metal‚ except hydrogen. When an ionic compound forms‚ the anion transfers an electron to the cation which creates an electrostatic bond and an electrically neutral compound. Also‚ they readily dissolve in aqueous solutions and are good conductors of heat and electricity. Further‚ ionic compounds
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molecule formed by the joining of smaller molecules‚ usually by a dehydration reaction. Polysaccharides‚ proteins‚ and nucleic acids are macromolecules. • Polymer: a long molecule consisting of many similar or identical monomers linked together by covalent bonds. • Monomer: the subunit that serves as the building block of a polymer. • Condensation (dehydration) reaction: a chemical reaction in which two molecules become covalently bonded to each other with the removal of a water molecule. • Hydrolysis:
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1. Polar molecules A. have bonds with an unequal distribution of electric charge. B. must form ions in water solution. C. have bonds with an equal distribution of electrical charge. D. have bonds with an overall negative charge. E. have bonds with an overall positive charge. Correct See Section 2.2: How Do Atoms Bond to Form Molecules? Points Earned: 1/1 Correct Answer: A Your Response: A 2. Hydrocarbons are _______ and _______‚ whereas salts are _______ and _______. A. nonpolar;
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Cell Biology (PCB 3023) Fall 2012 Review for Exam 1 Chapter 1 List the key commonalties and differences between prokaryotic and eukaryotic cells. Prokaryotic – no organelles; no nucleus; bacteria and Achaea; spherical‚ rodlike/corkscrew-shaped; cell wall; Eukaryotic – has nucleus; has organelles Commonalities – contain DNA that stores genetic information What is the main component of cellular membranes? What function(s) do membranes serve in cells? Made of phospholipids; defines
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January 2001 Number 12 Periodicity - Trends in Period 3 To succeed in this topic you need to:• understand the work in Factsheet 1 on Atomic Structure • understand the work in Factsheet 6 on structure of elements and compounds‚ including how bonding relates to physical properties. • be able to use the periodic table to locate the positions of elements. The Periodic Table In the periodic table‚ elements are placed in order of increasing atomic number (fig 1.) The horizontal rows of elements
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complex metal ion? A complex is a molecule or ion formed by the reaction of two or more ions or molecules capable of independent existence. What is COMPLEXATION????? Chemical reaction that takes place between the metal ion and a molecular or ionic entity (known as ligand). Also known as Chilometric titration‚ Chilometry‚ Chilatometric‚ EDTA titrations. It is a form of volumetric analysis in which the formation of a colored complex is used to indicate the end point of a titration.
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Guess Paper – 2009 Class – X Subject – Chemistry (P- Block Elements) Kalra sir 09460472649 kalra1977@rediffmail.com Group 15 elements: |Symbol |Atomic |Electronic configuration | | |number | | | |7 |[He]2s22p3 | |N | | | |P |15 |[Ne] 3s23p3 | |As |33 |[Ar]3d104s24p3
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COE CHEMONE Reviewer for CHEMONE Finals Rules for Counting Significant Figures 1. Nonzero integers. Nonzero integers always count as significant figures. 2. Zeros. There are three classes of zeros: a. Leading zeros are zeros that precede all the nonzero digits. These do not count as significant figures. In the number 0.0025‚ the three zeros simply indicate the position of the decimal point. This number has only two significant figures. Note that the number 1.00 _ 102 above is written in exponential
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