DISCUSSION NO. 3 THE PERIODIC TABLE OF ELEMENTS Members: Salvador‚ Kim Kristal G. Sanchez‚ Jhoana Marie V. Santeco‚ Francesca Anya C. Sy‚ Shane Francheska Lei Dayanne S. Ureta‚ Nheimelyn E. INUR-7 GROUP 10 HISTORY OF THE PERIODIC TABLE The discoveries of elements stole a long period of time. As a matter of fact‚ several elements were mentioned in Biblical accounts and Koran. However‚ it was in the 19th century where they get to discover a lot of element. And as the number of
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1) Chemistry Review Key Terms: empirical knowledge theoretical knowledge law of conservation of mass coefficient chemical amount mole Key Concepts: Write chemical equations when given reactants and products (1.5‚ 1.6) Write balanced chemical equations (2.2‚ 2.3) Interpret balanced chemical equations in terms of chemical amount (in moles) (2.3) Convert between chemical amount and mass (2.4) Classify chemical reactions (2.5‚ 2.6) Predict the solubility of elements and ionic and
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different elements differ? What determines how atoms bond to other atoms (intramolecular bond)? How can you determine which intramolecular bond [ionic‚ polar covalent‚ non-polar covalent] will form based on the periodic chart and table of electronegativities? What are intermolecular hydrogen bonds? How do they form? How would you determine whether a molecule is likely to dissolve in water or not? Macromolecules (Structures (monomers‚ polymers)‚ roles and structures) Carbohydrates Monosaccharides
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FRQ #3 a.) The first property of water is its polarity. A water molecule is formed by one oxygen atom covalently bonded to two hydrogen atoms. The electronegativity of the oxygen atom creates an unequal sharing of electrons between the O and H atoms of the molecule. This also gives water the ability to form hydrogen bonds between the slightly negative oxygen atom and the slightly positive hydrogen atom. Water has a high specific heat due to the hydrogen bonds. Because of this‚ water requires
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table tell you about a Group A element? Define molecule Define compound Define ionic bond and describe how they are formed Define ion Define cation Define anion Define polyatomic ion Define covalent bond and describe how they are formed Define electronegativity and describe how it is used to determine if a bond is ionic‚ polar covalent or nonpolar covalent Define polar covalent bond Define nonpolar covalent bond What kind of bonds are found within a water molecule? What kind of bond holds different
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CH’s‚ therefore more insoluble than alanine 3.) Ser because the alcohol group is more polar than the amine in lys 4.) 1 = ala‚ 2 = val‚ 3 = leu‚ 4 = phe (ranking is based on ↑ # of CH’s) Principles of Polarity * The greater the electronegativity difference between atoms in a bond‚ the more polar the bond. Partial negative charges are found on the most electronegative atoms‚ the others are partially positive. In general‚ the presence of an oxygen is more polar than a nitrogen because
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The Chemical Basis of Life Chapter Objectives Opening Essay Explain why an understanding of chemistry and the properties of water are important aspects of biology. Elements‚ Atoms‚ and Compounds 2.1 Define matter‚ an element‚ a compound‚ and a trace element. 2.2 Explain how and why iodine‚ fluoride‚ and iron are added to the human diet. 2.3 Distinguish between the size‚ location‚ and properties of protons‚ electrons‚ and neutrons. 2.3 Define the atomic number and mass number of an atom
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The Ionic Lattice In most ionic compounds‚ the anions are much larger than the cations‚ and it is the anions which form the crystal array. The smaller cations reside in the holes between the anions. Basic Concepts: 1. Ions are assumed to be charged‚ incompressible‚ nonpolarizable spheres. 2. Ions try to surround themselves with as many ions of opposite charge as closely as possible. Usually in the packing arrangement‚ the cation is just large enough to allow te anions to surround it without
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(a) CH3CH2COOH (b) CH3CH2CHO (c) CH3CH2CH2OH (d) CH3COCH3 4. Which of the following is a primary amine? (a) CH3CH2NHCH3 (b) CH3CH2NHCH(CH3)2 (c) CH3CH2N(CH3)2 (d) (CH3)3CNH2 5. Which of the following elements has the highest electronegativity? (a) C (b) P (c) Si (d) Cl 6. Which of the following is an ionic bond? (a) F-F (b) C-H (c) Li-O (d) C-N 7. Which of the following molecules has a molecular dipole? (a) 1 (b) 2 (c) 3 (d) 4
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CHLORINE Chlorine is an element I would like to present today. It is discovered in 1774 by Carl Wilhelm Scheele and was named by Sir Humphry Davy in 1810‚ after a Greek word‚ khlôros‚ which means greenish yellow. Chlorine is in the halogen group in the periodic table with an atomic number of seventeen. Pure chlorine is yellowish-green but most common compounds with chlorine are typically colourless. The element itself was first produced in 1774 by Carl Wilhelm Scheele‚ by heating hydrochloric acid
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