synoptic - chemnotes.org.uk
... Note the following definitions: Bond enthalpy – enthalpy needed to break a covalent bond (applies to a bond that only occurs in 1 molecule e.g. H-H) Mean bond enthalpy – enthalpy needed to break a covalent bond averaged over many compounds (applies to a bond that occurs in many compounds e.g. C-H) I ...
... Note the following definitions: Bond enthalpy – enthalpy needed to break a covalent bond (applies to a bond that only occurs in 1 molecule e.g. H-H) Mean bond enthalpy – enthalpy needed to break a covalent bond averaged over many compounds (applies to a bond that occurs in many compounds e.g. C-H) I ...
Chapter 4: Introduction to Earth Chemistry Section 1 Notes
... A coefficient ___________________ the subscripts in an equation. Chemical Bonds The forces that hold together the atoms in molecules are called _______________________. Chemical bonds form because of ____________________________________________________________. Atoms form chemical bonds by either __ ...
... A coefficient ___________________ the subscripts in an equation. Chemical Bonds The forces that hold together the atoms in molecules are called _______________________. Chemical bonds form because of ____________________________________________________________. Atoms form chemical bonds by either __ ...
Matter Unit
... mass which is unique to that element. Atoms cannot be subdivided, created, or destroyed in ordinary chemical reactions. However, these changes CAN occur in nuclear reactions! All matter is composed of atoms Atoms of any one element differ in properties from atoms of another element ...
... mass which is unique to that element. Atoms cannot be subdivided, created, or destroyed in ordinary chemical reactions. However, these changes CAN occur in nuclear reactions! All matter is composed of atoms Atoms of any one element differ in properties from atoms of another element ...
All That Matters - Teach-n-Learn-Chem
... Just as there are 12 inches in one foot, there are 100 centimeters in one meter. The labels on the ends of these numbers are called units or dimensions. Dimensional analysis is the process of changing the units on a number, usually to make a number more manageable. We might say a certain event took ...
... Just as there are 12 inches in one foot, there are 100 centimeters in one meter. The labels on the ends of these numbers are called units or dimensions. Dimensional analysis is the process of changing the units on a number, usually to make a number more manageable. We might say a certain event took ...
Document
... 43) In a chemical reaction, the name(s) of the material(s) that you start with are called the reactants and appear on the left side of the arrow, 44) In a chemical reaction, the name(s) of the material(s) that you end with are called the products and appear on the right side of the arrow. 45) In a c ...
... 43) In a chemical reaction, the name(s) of the material(s) that you start with are called the reactants and appear on the left side of the arrow, 44) In a chemical reaction, the name(s) of the material(s) that you end with are called the products and appear on the right side of the arrow. 45) In a c ...
The Chemical Earth
... The name of the element closer to the bottom or left-hand side of the periodic table is written first. The the suffix ‘-ide’ is added to the end of the name of the second element. The number of atoms of each element is indicated by the prefixes ‘mono-’, ‘di-’, ‘tri-’, ‘tetra-’, ‘penta-’ or hexa-’, w ...
... The name of the element closer to the bottom or left-hand side of the periodic table is written first. The the suffix ‘-ide’ is added to the end of the name of the second element. The number of atoms of each element is indicated by the prefixes ‘mono-’, ‘di-’, ‘tri-’, ‘tetra-’, ‘penta-’ or hexa-’, w ...
Chapter 2 - Molecules of Life (Biochemistry) Periodic Table of
... • Electrons not shared equally! • One atom “hogs” the electrons! • This leads to the formation of hydrogen bonds.! ...
... • Electrons not shared equally! • One atom “hogs” the electrons! • This leads to the formation of hydrogen bonds.! ...
Unit 1 - Morgan Science
... ◦ Ability of an atom to attract an electron from another atom when in a compound. Noble gases are usually omitted since they don’t form compounds ...
... ◦ Ability of an atom to attract an electron from another atom when in a compound. Noble gases are usually omitted since they don’t form compounds ...
Chapter Outline • Review of Atomic Structure Electrons, protons
... The atomic mass unit (amu) is often used to express atomic weight. 1 amu is defined as 1/12 of the atomic mass of the most common isotope of carbon atom that has 6 protons (Z=6) and six neutrons (N=6). Mproton ≈ Mneutron = 1.66 x 10-24 g = 1 amu. The atomic mass of the 12 C atom is 12 amu. The atomi ...
... The atomic mass unit (amu) is often used to express atomic weight. 1 amu is defined as 1/12 of the atomic mass of the most common isotope of carbon atom that has 6 protons (Z=6) and six neutrons (N=6). Mproton ≈ Mneutron = 1.66 x 10-24 g = 1 amu. The atomic mass of the 12 C atom is 12 amu. The atomi ...
CHM_101_TUTORIAL_QUESTIONS_1
... 5. Screening & Shielding effect: Presence of other orbits between nucleus and last orbit decreases the nuclear attraction. This effect is called screening effect but electron-electron repulsion is called shielding effect which also decreases the nuclear attraction. Due to presence of these effects i ...
... 5. Screening & Shielding effect: Presence of other orbits between nucleus and last orbit decreases the nuclear attraction. This effect is called screening effect but electron-electron repulsion is called shielding effect which also decreases the nuclear attraction. Due to presence of these effects i ...
Type of Bonding
... • the (+) nucleus of a nonpolar atom attracts the (-) charged electrons of another nonpolar atom resulting in instantaneous, induced, dipoles and fluctuating electron ...
... • the (+) nucleus of a nonpolar atom attracts the (-) charged electrons of another nonpolar atom resulting in instantaneous, induced, dipoles and fluctuating electron ...
The chemical elements are fundamental building materials of matter
... • ls = spin (+1/2) spin(-1/2) (spin quantum number) ...
... • ls = spin (+1/2) spin(-1/2) (spin quantum number) ...
Chapter 2
... regions of molecules attract each other. Weak bonds reinforce the shapes of large molecules and help molecules adhere to each other. Web/CD Activity2H: Hydrogen Bonds A molecule’s biological function is related to its shape (pp. 37-38, FIGURE 2.17) A molecule’s shape is determined by the positions ...
... regions of molecules attract each other. Weak bonds reinforce the shapes of large molecules and help molecules adhere to each other. Web/CD Activity2H: Hydrogen Bonds A molecule’s biological function is related to its shape (pp. 37-38, FIGURE 2.17) A molecule’s shape is determined by the positions ...
AP Biology
... regions of molecules attract each other. Weak bonds reinforce the shapes of large molecules and help molecules adhere to each other. Web/CD Activity2H: Hydrogen Bonds A molecule’s biological function is related to its shape (pp. 37-38, FIGURE 2.17) A molecule’s shape is determined by the positions ...
... regions of molecules attract each other. Weak bonds reinforce the shapes of large molecules and help molecules adhere to each other. Web/CD Activity2H: Hydrogen Bonds A molecule’s biological function is related to its shape (pp. 37-38, FIGURE 2.17) A molecule’s shape is determined by the positions ...
2011 Chem Facts Key
... 33. Ionic bonds form when one atom transfers an electron to another atom when forming a bond with it. Which substance exhibits ionic bonding rather than covalent bonding? CO2 , N2O4, SiO2 , CaBr2 , C6H12O6 34. Lewis Dot Diagrams may be used to represent the formation of polyatomic ions or covalent m ...
... 33. Ionic bonds form when one atom transfers an electron to another atom when forming a bond with it. Which substance exhibits ionic bonding rather than covalent bonding? CO2 , N2O4, SiO2 , CaBr2 , C6H12O6 34. Lewis Dot Diagrams may be used to represent the formation of polyatomic ions or covalent m ...
2 - Castle High School
... • A box with a volume of 22.4 L contains 1.0 mol of nitrogen and 2.0 mol of hydrogen at 0C. Which of the following statements is true? • a. The total pressure in the box is 202.6 kPa. • b. The partial pressure of N2 and H2 are equal. • c. The total pressure is 101.3 kPa. • d. The partial pressure of ...
... • A box with a volume of 22.4 L contains 1.0 mol of nitrogen and 2.0 mol of hydrogen at 0C. Which of the following statements is true? • a. The total pressure in the box is 202.6 kPa. • b. The partial pressure of N2 and H2 are equal. • c. The total pressure is 101.3 kPa. • d. The partial pressure of ...
Midterm Review 2017
... 25) Which statement explains why nuclear waste materials may pose a problem? 1) They frequently have short half-lives and remain radioactive for brief periods of time. 2) They frequently have short half-lives and remain radioactive for extended periods of time. 3) They frequently have long half-live ...
... 25) Which statement explains why nuclear waste materials may pose a problem? 1) They frequently have short half-lives and remain radioactive for brief periods of time. 2) They frequently have short half-lives and remain radioactive for extended periods of time. 3) They frequently have long half-live ...
AP Chemistry Test Review
... 34) Calculate K by doing ICE box problems 35) acid/base definitions…Bronsted-Lowry = acids donate protons; Lewis= acids accept e- pair 36) calculate pH, pOH, [H+], [OH−] 37) acid equilibrium problems…ICE box…remember pH can be used to find [H+]. 38) salt pH…example: Na2CO3 = slightly basic; Al(NO3)3 ...
... 34) Calculate K by doing ICE box problems 35) acid/base definitions…Bronsted-Lowry = acids donate protons; Lewis= acids accept e- pair 36) calculate pH, pOH, [H+], [OH−] 37) acid equilibrium problems…ICE box…remember pH can be used to find [H+]. 38) salt pH…example: Na2CO3 = slightly basic; Al(NO3)3 ...
Final Exam Review Answers
... b. decreases from top to bottom within a group. c. remains constant within a period. d. decreases from left to right across a period. ...
... b. decreases from top to bottom within a group. c. remains constant within a period. d. decreases from left to right across a period. ...
PIB and HH - Unit 4 - Chemical Names and Formulas
... bonds is an ionic compound. Nearly all ionic compounds are crystalline solids at room temperature. They have high melting points. The total positive charge cancels out the total negative charge, yielding a neutral compound. When melted or in solution, ionic compounds can conduct electricity, because ...
... bonds is an ionic compound. Nearly all ionic compounds are crystalline solids at room temperature. They have high melting points. The total positive charge cancels out the total negative charge, yielding a neutral compound. When melted or in solution, ionic compounds can conduct electricity, because ...
Fundamental of Organic chemistry
... The structure of benzene can be considered as a further extension of delocalisation from the conjugated dienes. ...
... The structure of benzene can be considered as a further extension of delocalisation from the conjugated dienes. ...
Name - Madison County Schools
... A. Who first arranged the periodic table by atomic mass? Dmitri Mendeleev B. What characteristics did Mendeleev use to place the elements in order when creating the periodic table? Rows - Increasing mass Columns – Similar properties C. What are valence electrons? Electrons in the highest occupied en ...
... A. Who first arranged the periodic table by atomic mass? Dmitri Mendeleev B. What characteristics did Mendeleev use to place the elements in order when creating the periodic table? Rows - Increasing mass Columns – Similar properties C. What are valence electrons? Electrons in the highest occupied en ...
Final Preparation
... A) lowering the activation energy of a reaction C) changing the energetic involved in a reaction B) changing the equilibrium constant D) increasing the time it takes for a reaction to take place 80. Some enzymes require certain metal ions, such as Mg2+ or Zn2+, in order to have full activity. This c ...
... A) lowering the activation energy of a reaction C) changing the energetic involved in a reaction B) changing the equilibrium constant D) increasing the time it takes for a reaction to take place 80. Some enzymes require certain metal ions, such as Mg2+ or Zn2+, in order to have full activity. This c ...
Thursday, March 27, 2008
... 3. They have different masses and the same charges. 4. They have different masses and different charges. ...
... 3. They have different masses and the same charges. 4. They have different masses and different charges. ...
Chapter 8 Study Guide
... a. Chemists discovered that if two or more different compounds are composed of the same elements, the ratio of the masses of the second element is always a ratio of small whole numbers. This example illustrates the law of multiple proportions ...
... a. Chemists discovered that if two or more different compounds are composed of the same elements, the ratio of the masses of the second element is always a ratio of small whole numbers. This example illustrates the law of multiple proportions ...
Resonance (chemistry)
In chemistry, resonance or mesomerism is a way of describing delocalized electrons within certain molecules or polyatomic ions where the bonding cannot be expressed by one single Lewis formula. A molecule or ion with such delocalized electrons is represented by several contributing structures (also called resonance structures or canonical forms).Each contributing structure can be represented by a Lewis structure, with only an integer number of covalent bonds between each pair of atoms within the structure. Several Lewis structures are used collectively to describe the actual molecular structure, which is an approximate intermediate between the canonical forms called a resonance hybrid. Contributing structures differ only in the position of electrons, not in the position of nuclei.Electron delocalization lowers the potential energy of the substance and thus makes it more stable than any of the contributing structures. The difference between the potential energy of the actual structure and that of the contributing structure with the lowest potential energy is called the resonance energy or delocalization energy.Resonance is distinguished from tautomerism and conformational isomerism, which involve the formation of isomers, thus the rearrangement of the nuclear positions.