physics it is agreed that the atom is made up of 3 key components: electrons, protons and neutrons. On the periodic table the position of an atom is decided by the number of protons and neutrons in the nucleus of the atom. The proton, electron and neutron all have different characteristic regarding mass and charge these are as follows: Particle | Relative Mass | Relative Charge | Proton | 1 | +1 | Neutron | 1 | ±0 | Electron | 1/2000 | -1 | Most of the atom is empty space, 99.9% to be
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Introduction to Chemistry I (MAE1106) Chapter 1: Properties, Measurement and Units Matter: All things we can see, or touch, whether books, pencils, telephones, or people as they have some thing in common. They are all composed of matter which is defined as anything that takes up space and has mass. Matter is generally considered to be a substance (often a particle) that has rest mass and (usually) also volume. Mass and weight are not really the same. The mass of a body is a measure of its
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See Concept 2.3: Carbohydrates Consist of Sugar Molecules | Points Earned: | 0/1 | Correct Answer: | D | Your Response: | E | 2. | Which of the following biological molecules are linked by covalent bonds formed by the removal of the elements of water from the reactants (a kind of condensation reaction)? | | A. | Oils | B. | Fats | C. | Proteins | D. | Starch | E. | All of the above | | Correct See Concept 2.2: Atoms Interact and Form Molecules | Points Earned: | 1/1 | Correct
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• List the organ systems of the human body and their major components. 1.) Integumentary system: skin and nails. 2.) Skeletal system- bones 3.) Muscular system- tendons/muscles 4.) Lymphatic system- thymus and the spleen. 5.) Nervous system- brain and spinal cord 6.) Cardiovascular system- heart and blood vessels 7.) Endocrine system- pituitary gland, hypothalamus 8.) Digestive system- stomach and liver. 9.) Reproductive system- Penis and ovaries 10.) Urinary
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chemical elements in pure form and in combinations called compounds. A) Elements- a substance that cannot be broken down to other substances by chemical reactions. 1) Hydrogen, oxygen, nitrogen, and carbon make up 96% of living matter. 2) Other 4% include phosphorus, sulfur, calcium, and potassium. They’re called trace elements- those required by an organism in only minute quantities. B) Compounds- a substance consisting of two or more different elements combined
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Chapter 2: Chemistry and molecules of life -Homeostasis- The maintenance of an internal environment -Energy- The ability to do work -Metabolism- Chemical reactions in a cell that allows it to use energy -Element- A chemically pure substance that cannot not be broken down -Matter- anything that takes of space -Atom- smallest unit of an element -Proton- positively charged particle inside nucleus -Electron- negatively charged particle around nucleus -Neutron- uncharged particle
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Review the definition of an atom. What is meant by the idea that it is “the smallest unit of a pure substance that retains properties of that substance”? 3. Understand the nature and arrangement of the subatomic structure of atoms. Where are the subatomic particles found? 4. Why are we concerned about whether atoms are reactive or not? 5. What determines whether a particular element (type of atom) is reactive? 6. Understand the difference between inert elements and those that are reactive
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Atoms, Molecules and Ions Atoms Chemistry is the study of matter and the interactions between different types of matter and energy. The fundamental building block of all matter is the atom. An atom consists of three main parts: protons, neutrons, and electrons. The center of an atom is called nucleus that contain neutrons and protons. The nucleus is surrounded by moving electrons. Protons have a positive electrical charge. Neutrons have no electrical charge. Electrons have
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atomic mass Atomic mass is the mass of an atom in atomic mass units (amu). One amu is defined as 1/12 of one C-12 atom. The C-12 isotope has a mass of exactly 12.000 amu. The C-12 isotope provides the relative scale for the masses of the other elements. Average atomic mass is the value reported on the periodic table, which takes into account the various isotopes of an element and their respective frequencies. To calculate the average atomic mass of an element, add up the different masses of the isotopes
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50 ϫ 1020 atoms Fe 2.50 ؋ 1020 atoms Fe ؋ Practice Problems ؋ 51.4 ؍ 10؊4 1 mol Fe __ 6.02 ؋ 1023 atoms Fe mol Fe pages 323–324 1. Zinc (Zn) is used to form a corrosion-inhibiting surface on galvanized steel. Determine the number of Zn atoms in 2.50 mol of Zn. 2.50 mol Zn ؋ 4201 ؋ 15.1 ؍ ___ 6.02 ؋ 1023 atoms Zn 1 mol Zn atoms of Zn 2. Calculate the number of molecules in 11.5 mol of water (H2O). 11.5 mol H O ؋ ___ 6.02 ؋ 1023 molecules H2O 2
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