ELECTRONEGATIVITY This page explains what electronegativity is‚ and how and why it varies around the Periodic Table. It looks at the way that electronegativity differences affect bond type and explains what is meant by polar bonds and polar molecules. If you are interested in electronegativity in an organic chemistry context‚ you will find a link at the bottom of this page. What is electronegativity Definition Electronegativity is a measure of the tendency of an atom to attract a bonding pair
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Test #2 ANSWERS CHM 101 Part I Multiple Choice (2 points each) 1. Which element is most likely to form three covalent bonds? A) C B) Si C) P D) S E) Se 2. A chemical bond formed when two atoms share two pairs of electrons is a ________ bond; it is best described as ________. A) double; covalent B) double; ionic C) single; covalent D) single; ionic E) triple; covalent 3. Which property could describe a covalent compound? A) It conducts electricity when melted. B) Has a low boiling
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Chemical Bonds Go to http://www2.nl.edu/jste/bond.htm 1. What is an ion? An ion is an atom that has gained or lost electrons. 2. What type of bonds do oppositely charged ions form? Oppositely charged ions form ionic bonds. 3. A sodium ion is different than a sodium atom. It has a positive charge. How many protons and electrons does a sodium atom have? Number of protons 11; Number of electrons 18 How about a chlorine ion? Number of protons 17; Number of electrons 18 4. What type of bond form
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Current‚ Voltage and Power * Electricity is the flow of electric charge. We can describe the flow of electric charge in several ways. These include the quantities Current‚ Voltage and Power. Current * Current (I) is the rate of flow of Charge Carriers‚ such as electrons. Current is usually thought of as moving in the direction of positive charge‚ so from the positive power supply to the negative. However‚ since in metals it is electrons that carry electric charge‚ the actually flow is opposite
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(write the symbols with a bond between them)‚ the electronegativity difference between them‚ and the type of chemical bond it represents. If the bond is ionic‚ state what ions are produced. If the bond is polar covalent‚ indicate the direction of the dipole on the symbols from the first part. a) KCl Electronegativity difference = K - Cl = 0.8 - 3.0 = 2.2 ionic bond K1+ Cl1- b) LiBr Electronegativity difference = Li - Br = 1.0 - 2.8 = 1.8 ionic bond Li1+ Br1-
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A. MATTER * Nature of matter. * Describe the states of matter and explain their conversion in terms of the kinetic particle theory. * Describe and explain diffusion. * Describe dependence of rate of diffusion on molecular mass‚ qualitatively. * Experimental techniques Measurement. * Name appropriate apparatus for the measurement of time‚ temperature‚ mass and volume‚ including burettes‚ pipettes and measuring cylinders. Criteria of purity. * Identify substances
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1. What is an ionic bond? Typically an ionic bond occurs between one metal and one non-metal ion. One atom borrows one or more electrons from another atom. An ionic bond is a type of chemical bond that occurs when one atom loses an electron to form a positive ion and the other atom gains an electron to form a negative ion‚ which then result in attraction. 2. What is a covalent bond? A covalent bond is a bond that occurs when atoms in a molecule share a pair of electrons. For example‚ “the
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likely to be ionic? A. KF B. CCl4 C. CS2 D. CO2 E. ICl 2. Which of these compounds is most likely to be ionic? A. NCl3 B. BaCl2 C. CO D. SO2 E. SF4 3. Which of these compounds is most likely to be covalent? A. Rb2S B. SrCl2 C. CS2 D. CaO E. MgI2 4. Which of these compounds is most likely to be covalent? A. CsOH B. NF3 C. Sr(NO3)2 D. CaO E. LiF 5. The Lewis dot symbol for the chloride ion is A. B. C. D. E. 6. Which of these ionic solids would
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tendency to form bonds? The number of valence electrons in the valence shell determines how many “vacancies” an atom has to fill before it is stable. If its valence shell is filled‚ it is chemically inert; if it has one or more vacancies it tends to be chemically reactive. 3. Explain how electronegativity differences between atoms result in nonpolar covalent bonds‚ polar covalent bonds‚ and ionic bonds. The difference in electronegativity between atoms results in different kinds of bonds: nonpolar covalent
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Topic 5 – Bonding and Structure Revision Notes 1) Introduction • Atoms form bonds to get a full outer shell of electrons • There are three types of bonding: ionic‚ covalent and metallic • The structures produced by forming bonds are either giant or simple • The possible combinations of structure and bonding are giant ionic‚ simple covalent‚ giant covalent and giant metallic • Simple covalent is sometimes called simple molecular • Giant covalent is sometimes called giant
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