Lecture 12 Chapter 6 6.1 Thermochemistry: Energy & units (p.227) From observation we know‚ that - some chemical reactions begin as soon as the reactants come into contact with each other (precipitation reactions) - some reactions are slow or even so slow at room temperature that even lifetime is not enough to observe a measurable change (rusting of iron‚ tarnishing silver) Also‚ almost all chemical reactions involve exchange of heat (or energy): in combustion reactions
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electromagnetic fields which act on other charges. Electricity occurs because of the following‚ an electric charge‚ that is a property of some subatomic particles‚ which determines their electromagnetic interactions. Electrically charged matter is influenced by‚ and produces‚ electromagnetic fields‚ electric current which is a movement or flow of electrically charged particles‚ typically measured in amperes. Electric field an especially simple type of electromagnetic field produced by an electric charge even
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Nuclear chemistry in medicine is very controversial. Many say the dangers of using radioactive materials on human bodies are far more negative than positive. Others strongly agree with the use of radiochemistry in the field of medicine. Nuclear medicine is in the field of medicine by using imaging devices. Doctors use small amounts of radioactive materials called radio tracers that are either injected into the bloodstream‚ inhaled or swallowed. Radiation therapy is also a therapy that uses radioactive
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CHEMISTRY 17 1ST LONG EXAM REVIEWER I. ELECTRONIC STRUCTURE OF ATOMS -arrangement of atoms’ electrons -the number of electrons in an atom -distribution of electrons around the nucleus and their energies • ATOMS *Billiard Ball Model (JOHN DALTON) *Plum Pudding Model (JOSEPH J. THOMPSON) *RUTHERFORD’s Model of Atom -atoms are tiny‚ hard‚ indivisible spheres -electrons (negative charge) occupy the atom - Atom is mostly empty space with a dense nucleus • PROBLEMS with Rutherford’s Model
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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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nucleus‚ while the rest was mostly empty space. Rutherford came to this conclusion by his famous gold foil experiment. This experiment involved firing of radioactive particles through thin‚ gold‚ metal foils and detecting them using a scintillator (screens covered with zinc sulfide). He then found that the majority of the particles passed right through the foil and only about 1 out of 8000 were deflected (Chemsoc Timeline). This experiment led him to the theory that most of the atom was made up of
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Quiz 2: Questions and answers from week 2 covering Chapters 3 and 5 in Cracolice and Peters. Question 1: Which of the following numbers are correctly expressed in exponential notation? i. 43‚200‚000 = 4.32 x 10 7 ii. 0.000977 = 9.77 x 10 4 iii. 606‚000 = 6.06 x 10 -5 iv. 0.00000175 = 1.75 x 10 -6 Answer: i and iv Question 2: Which of the following numbers are correctly expressed in ordinary decimal form? i. 6.21 x 10 5 = 621‚000 ii. 7.28 x 10 6 = 0.00000728 iii. 9.03 x 10 -4 = 0.000903 iv. 1.12 x
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The Universe is a vast‚ enormous space that holds everything that exists from the smallest subatomic particles to the largest galaxies. Galaxies and solar systems are constantly clashing and creating new worlds within our Universe. Within these billions of galaxies‚ are solar systems. Our solar system‚ the Milky Way‚ contains many stars‚ planets‚ black holes and everything in between. The universe is a net that holds everything that exists. Everything that is not within the universe‚ is non-existent
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Associate Program Material Levels of Life Worksheet Complete all three parts of this worksheet. Part I: Atomic Structure – Fill in the missing information on atomic structure and organic compounds. Atomic Structure Subatomic Particle Charge Location in an Atom Proton Positive Nucleus Neutron Neutral Nucleus Electron Negative Spherical (outer-shell) Organic Compounds Large Biological Molecule Atoms it Contains Monomer(s) Function(s) in Living Organisms Carbohydrates
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and particularly with the properties of chemical bonds. Chemistry is also concerned with the interactions between atoms and various forms of energy Q.DEFINE THE BRANCHES OF CHEMISTRY. * Physical chemistry is the study of macroscopic‚ atomic‚ subatomic‚ and particulate phenomena in chemical systems in terms of laws and concepts of physics. It applies the principles‚ practices and concepts of physics such as motion‚ energy‚ force‚ time‚thermodynamics‚ quantum chemistry‚ statistical mechanics and dynamics
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