is formed from an atom? A. Neutrons are lost or gained. B. Protons are lost or gained. C. The nucleus disintegrates. D. Electrons are lost or gained. E. Either protons or electrons are lost or gained. 2 When comparing a 10.00 g sample of iron with a 10.00 g sample of lead: A. each sample has the same number of atoms. B. there are more iron atoms than lead atoms. C. there are more lead atoms than iron atoms. D. it is not possible to tell which sample contains more atoms. E. the lead is
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His theory stated that atoms were invisible and indestructible. Since Democritus did not really have that much technological support at the time‚ he could not elaborate on his suggestion. That’s where John Dalton came in…..2000 years later. Dalton used experimental methods to
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Trends in the Periodic Table * Generally‚ the atomic radius decreases across a period from left to right and increases down a given group. The atoms with the largest atomic radii are located in Group I and at the bottom of groups. Moving from left to right across a period‚ electrons are added one at a time to the outer energy shell. Electrons within a shell cannot shield each other from the attraction to protons. Since the number of protons is also increasing‚ the effective nuclear charge increases
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strongest chemical bonds. An ionic bond forms when two atoms differ so much in electronegativity that one or more electrons are actually transferred from one atom to the other. Ionic bonds generally occur between a metal and a nonmetal. Due to the existence of ionic bonds‚ elements that normally would not combine because sharing electrons is either not possible or not practical may be combined to form chemical compounds. A covalent bond forms when two atoms share a pair of electrons. The sharing of one pair
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1. Define science – Science is the development of concepts about the natural world ‚ often by using the scientific method 2. Define multicellular organism - are those organisms containing more than one cell‚ and having differentiated cells that perform various functions. 3. Identify the 3 domains of living things. Which domains include one-celled organisms with no nucleus? a) Organized‚ Homeostatic & Reproduce. b) Bacteria & Archaea 4. Modern taxonomists (scientists
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many hypotheses Bioethics is a branch of biology concerned with? * The development and consequences of biological technology. The Organization of Life 1. Atoms 2. Molecules 3. Macromolecules 4. Organelles 5. Cells 6. Tissue 7. Organs 8. Organ Systems 9. Organism 10. Population 11. Species 12. Community 13. Ecosystem Atoms are joined together into complex clusters called? * Molecules The most basic level is that of __________‚ which are groups of similar cells that act as a
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Lesson 03.01: History of the Periodic Table Explain how scientific observations led to the development of‚ and changes to‚ the periodic table. Russian chemist Dmitri Mendeleev set out to organize the 63 known elements according to their properties. Mendeleev wrote the name‚ mass‚ and chemical properties of each element on a separate card and arranged the cards by various properties‚ looking for trends and patterns. When he arranged the elements by increasing atomic mass‚ Mendeleev noticed that similar
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Synopsis – Grade 9 Science Term II Chapter 1: Atoms and Molecules Law of conservation of mass: Mass can neither be created nor can it be destroyed in a chemical reaction. Law of constant proportion: A chemical substance always contains the same elements in a fixed proportion by mass‚ irrespective of the source of compound. Atom: The smallest particle which is the building block of matter. The symbol of the element is made from one or two letters of the English
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Unit 1 Key Questions Lesson 1 1. One argument against continuing research on the atom is that the cost continues to increase at an alarming rate‚ and the benefits seem to be declining. Whereas quantum chemistry experiments as early as 80 years ago were very cheap and yielded considerable practical results‚ now very few if any practical results are emerging‚ but the costs of experiments continues to increase. On the other hand
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6 Define the term “atom” and describe its component parts. Ch 3.2 “What’s an Atom?”‚ “What are Its Parts?” http://www.youtube.com/watch?v=lP57gEWcisY&list=PL3FE5B87E56E7A849&index=2 7 Explain how protons‚ neutrons and electrons are arranged within atoms. Ch 3.2 “How do Atoms Differ from Each Other?” “How are the Parts of an Atom Arranged?” http://www.youtube.com/watch?v=lP57gEWcisY&list=PL3FE5B87E56E7A849&index=2 8 Explain how the distribution of electrons in an atom or ion determines the
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