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20 Cards in this Set
- Front
- Back
- 3rd side (hint)
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1- What is an atom?
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An atom is the smallest particle of an element - retains all properties of element.
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cell has Nucleus, +charged Protons, neutral charge neutrons, surrounded by - charged Electrons in orbit around nucleus.
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2- What is the charge in an intact atom?
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An intact atom carries NO charge.
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3-If an atom has 4 protons and 3 neutrons, what is the atomic wt/mass?
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7
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Add protons=neutrons= Mass
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4-Iodine contains 53 protons. its atomic wt is 126.9. What is the atomic # ?
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Atomic # is the # of protons
= 53 |
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5-What is the only element whose atomic wt equals its atomic number?
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Hydrogen
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6-How do we refer to different forms of an element differing only in the # of neutrons in the nucleus?
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By the Isotope
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7-How many electrons could be contained in the first, second, third & fourth shells?
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The first shell > 1 pair
Second shell> 4 orbitals Third shell > 9 orbitals Fourth shell > 16 orbitals |
Electrons held in each shell
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8- Define the word valence
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Valence is the # of electrons in the outermost shell of an element
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last shell
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9- Is Helium considered an inert gas? If so, why?
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Helium > inert gas because the outer orbital is filled.
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It has no electrons 2 share or donate to another atom
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10-Define polarity: Describe its importance in a biological system.
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Polarity occurs when a molecule has no correspondence to distribution of
charges (+/-) to poles |
Ex: In biological system, polarity occurs in water. molecule with oxygen has - charge... polarizes with hydrogen having a + charge.
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11- Which is a better conductor, distilled water or saline?
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Saline
R) Saline conducts electricity Better than distilled water b/o the ionic nature of the dissolved +/- ions |
charged particles passing the electrical current across their own charged particles.
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12- What is an electrolyte?
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An electrolyte is a substance that releases ions when dissolved in water.
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Electrostatic attraction occurs between ions of opposite charge. Ex: Na+Cl-
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13- Can more than one substance share the same molecular formula?
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Yes. Fructose and Galactose both have the same molecular formula , but the atoms r arranged differently in each.
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14- Define pH
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The pH is a graduated numerical scale usd 2 measure the Acidity or Alkalinity of a solution.
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pH values: 1-6 Alkaline
7 neutral 7.5> Acidic |
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15- What term refers to five or more monosaccharides?
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Polysaccharides
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16- What physical characteristic separates lipids from other biological macromolecules?
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Lipids r NOT SOLUBLE in solvents > water
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Lipids r soluble in substances like benzene & chloroform
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17- What are 3 major functions of membrane proteins?
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Recieve molecular proteins
Bind & transport nutrients Act as enzymes |
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18-Name 5 organells found in Eukaryotic organism & describe their function.
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1- nucleus / contains cellular DNA
2- Goli apparatus / pkgs molecules 4 transport 3- Vacuoles store nutrients 4- Endoplasmic Reticulum have ribosomes & protein 5- Mitochondria generate chemical reactions |
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19-Name 5 biological characteristics 4 cell 2 b living entity
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1- growth
2- reproduction/heredity 3- metabolism 4-movement 5- transport substances in/out of cell |
Viruses do NOT possess #2,#3 outside their host cell
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20-How do Eukaryotic cells reproduce? How do Prokaryotic cells reproduce?
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Eukaryotic cells can produce BOTH ASEXUALLY & SEXUALLY
Prokaryotic cells can produce Only ASEXUALLY |
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