mr. k final exam – Flashcards
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Who believed there were only 4 elements (earth, wind, fire, and water)?
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Aristotle
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How many sodium atoms are present in this molecule? 7Na3PO4
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21
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Each vertical column on the periodic table is called a(an)
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family
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Ionic bonding involves the ________ of electrons.
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transferring
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What is the name of the compound CaI2?
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Calcium iodide
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Which change makes the chemical reaction occur faster?
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increasing the temperature
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What does the term "atom" mean?
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unable to be divided
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atomic number for neon
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10
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Which of the following is not an example of a physical change?
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burning a candle
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Mercury
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Hg
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Gold
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Au
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Helium
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He
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Plutonium
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Pu
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Magnesium
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Mg
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Carbon
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C
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Cobalt
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Co
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Nickel
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Ni
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Iron
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Fe
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Hydrogen
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H
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Copper
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Cu
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Oxygen
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O
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Nitrogen
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N
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Phosphorus
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P
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Potassium
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K
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Titanium
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Ti
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Tin
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Sn
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Aluminum
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Al
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Silicon
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Si
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Sulfur
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S
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Lead
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Pb
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Sodium
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Na
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Boron
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B
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Beryllium
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Be
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Francium
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Fr
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Cesium
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Cs
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Radon
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Rn
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Radium
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Ra
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Uranium
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Ur
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Zinc
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Zn
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What do atoms gain, lose, or share when they bond?
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electrons
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What type of compound is Be2NO3?
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ionic
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The most non-reactive family of elements is the
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noble gasses
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Which of the following is the electron configuration for calcium?
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2-8-8-2
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Which of the following chemical equations is balanced?
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2Ca + O2 -->2CaO
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What type a bond is formed when electrons are transferred from one atom to another?
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ionic
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As the molecules of water begin to slow down they go into a phase where they are no longer able to easily move past each other. The water is passing through a phase change and will
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remain a compound
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What type of compound is Cl4O3?
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covalent
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What type of equation is 2N2 + 2H2 ® 4NH3
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synthesis
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How many valence electrons does helium need to have a filled outermost energy level?
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2
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A chemical reaction that gives off energy in the form of heat is called a ____ reaction.
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exothermic
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How many electrons fill the outermost energy level of most atoms?
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8
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A student stirs 2 grams of salt into a cup of water. The student then tries to get the salt back by evaporating the water. In this experiment, the mass of salt recovered would be the same as the initial mass because?
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salt does not evaporate with water
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Most metals are
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solid at room temperature
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Which phase of matter has the most kinetic energy?
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gas
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Which phase of matter is represented by steam?
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gas
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How many valance electrons does magnesium have?
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2
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The smallest particle into which an element can be divided and still be the same substance is called an
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atom
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Most of the elements in the periodic table are
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metals
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Dalton believed that
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atoms of the same element are exactly alike
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Which element has the electron configuation 2, 8, 3?
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aluminum
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Which is an example of a chemical reaction?
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nails rusting
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In Thomson's "chocolate chip cookie" model of the atom, the chocolate chips represent
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electrons
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Which type of element is most likely to gain electrons when it forms bonds?
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nonmetals
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Which of the following is not an example of a chemical change?
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salt dissolving
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How many protons are in one atom of lead?
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82
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Whose model resembled a billard ball?
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Dalton
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The elements along the zigzag line on the period table are called
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metalloids
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What is the name of the compound CO2?
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carbon dioxide
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In this model of the periodic table, a group of elements that are arranged in a vertical column is called a
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family
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In which region of the table would nonmetals be found?
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3
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What is the atomic mass for Tin?
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119
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What did Rutherford discover?
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protons
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Which of the following elements would be ductile and malleable?
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copper
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Which of the following is not one of the basic ideas of Dalton's atomic theory?
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Atoms of different elements are exactly alike.
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Droplets of water forming on a bathroom mirror is the direct result of
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condensation
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Iron oxides, such as rust, form when iron metal reacts with oxygen in the air. What are the chemical symbols for the two elements found in iron oxide?
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Fe and O
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What are the only parts of an atom that make chemical bonds?
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valence electrons
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Which of the following represents the number of protons in an atom?
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atomic number
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Which method is the best way to find out whether a solution is an acid or base?
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Use litmus paper
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A calcium carbonate molecule has 1 calcium (Ca) atom, 3 oxygen (O) atoms, and 1 carbon (C) atom. Which of the following shows the chemical formula for calcium carbonate?
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CaCO3
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Where are electrons likely to be found?
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in energy levels
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Which of the following is found farthest from the center of an atom?
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electrons
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What is the same within each family on the periodic table?
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number of valence electrons
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What is the charge of an atom that has 13 protons and 10 electrons?
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+3
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When magnesium (Mg) metal is burned in the presence of oxygen (O2), magnesium oxide (MgO) is produced. The properties of magnesium oxide are different than the individual properties of magnesium and oxygen because magnesium oxide is
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a compound
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The model shows the structural formula for methane. Which of these is the proper chemical formula for methan?
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CH4
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The nucleus of an atom contains
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protons and neutrons
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Which of the following does not affect the rate of a chemical reaction?
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color
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How many atoms of oxygen are in one molecule of Mg(ClO)2?
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2
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In which state of matter are the particles likely to be closest together?
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solid
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Bonding that involves sharing of electrons within a molecule is called
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covalent bonding
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An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a mass number of
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197
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Which of these elements would most likely be a shiny, gray-colored solid at room temperature, conduct electricity, and dent when hit with a hammer?
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aluminum
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The picture shows one part of the periodic table of the elements. According to this information, how many protons does a carbon atom contain?
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6
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What do the elements sulfur (S), nitrogen (N), phosphorus (P), and bromine (Br) have in common?
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they are nonmetals
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Mr. K has a stomach that is upset. What could he take to make him feel better?
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something with a pH greater than 7
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Mrs. Hall tests an unknown substance with a pH meter. The liquid has a pH of 4. what type of substance is this liquid?
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acid
