to complete the passage. covalent bond molecule sigma bond exothermic pi bond When sharing of electrons occurs, the attachment between atoms that results is called a(n) (1) . When such an attachment is formed, bond dissociation energy is released, and the process is (2) . When two or more atoms bond by means of electron sharing, the resulting particle is called a(n) (3) . If the electrons shared are centered between the two atoms, the attachment is called a(n) (4) . If the
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Multiple-Choice Questions 1) About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter? A) carbon, sodium, chlorine, nitrogen B) carbon, sulfur, phosphorus, hydrogen C) oxygen, hydrogen, calcium, sodium D) carbon, hydrogen, nitrogen, oxygen E) carbon, oxygen, sulfur, calcium Answer: D Topic: Concept 2.1 Skill: Knowledge/Comprehension 2) Trace elements are those required by an organism in only minute quantities
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question. ______ 1. An ionic bond results from electrical attraction between a. cations and anions. b. atoms. c. dipoles. d. orbital. ______ 2. A nonpolar covalent bond is unlikely when two atoms of different elements join because the atoms are likely to differ in a. density. b. state of matter. c. electronegativity. d. polarity. ______ 3. Bond length is the distance between two bonded atoms at a. their minimum potential energy. b. their maximum kinetic energy. c. their maximum potential energy
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Chapter 5: Properties of Matter Matter is anything that has a mass and takes up space. The particle theory of matter is a theory that describes the composition and behavior. Matter can be many up of many different particles or only one. A pure substance is a type of matter that consists of only one type of particle. Then there are mixtures that are made up of at least two different types of particles. There are two different types of mixtures; mechanical mixtures and solutions. A mechanical mixture
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Chapter 2 : Biological Molecules End of this chapter the student will learn about: a) What is the Functional groups and types. b) Macromolecules a) The build up of covalent bond by condensation or dehydration. b) The brake up of covalent bond by hydrolysis c) The chemical elements of life: a review Functional groups contribute to the molecular diversity of life • The components of organic molecules that are most commonly involved in chemical reactions are known as functional groups
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are composed of atoms rather we can see them or not. Some elements are bonded with a variety of atoms to help form the molecules. All matter is made up of atoms that are very small, so small that they human eye cannot see. It does not matter if the liquid, solid, or gas even if it is a mixture or pure. These basic elements are the same elements that make up what is known as the periodic table. Mendeleev Demetri Mendeleev created the periodic table and was trying to put the elements in order by the
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occupies space. Matter is made of one or more elements. An element is the most pure form of matter. Elements are made of atoms. There are 111 elements and of these 92 are naturally occurring. Essential Elements About 25 elements are essential to life. These are called ‘essential elements’. 4 essential elements make up 96% of the human body. These are O, C, H and N. The other elements account for the remaining 4%. Trace Elements Certain elements are needed in trace amounts. These are also
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Topic 1 - Atoms, Ions and Compounds 1. Define a compound as a pure substance consisting of two or more elements chemically bonded in a fixed ratio by mass. A compound is a pure substance consisting of two or more elements chemically bonded in a fixed ratio by mass. Example: H2O or CO2 2.Define an ion as a charged atom (or a group of atoms). An ion is a charged atom or group of atoms. It forms when an atom loses or gains electrons (total number of electrons is not equal to the total number
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which you describe the periodic nature and properties of atoms and molecules. Explain at a level of detail Dmitri Mendeleev would have understood how halogens and alkali metals are extremely reactive, whereas noble gases are not reactive. Compare properties of molecules formed from atoms in similar families; for example, H2S versus H2O. Explain what is meant by the electronic structure of atoms. How does knowing the electronic structure of atoms aid chemists in predicting chemical reactions? Periodic
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The Shapes of Molecules Introduction Whether we consider the details of simple reactions, the properties of synthetic material, or the intricate life-sustaining processes of living cells, molecular shape is a crucial factor. 10.1 Depicting Molecules and Ions with Lewis Structures Lewis structures, also called electron-dot structures or electron-dot diagrams, are diagrams that show the bonding between atoms of a molecule, and the lone pairs of electrons that may exist in the molecule. A Lewis structure
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