Flashcard Answers on chemistry – Chemistry
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1) Which of the following statements about atoms is FALSE? A) Atoms compose all matter. B) Atoms are responsible for the sensation of smell. C) Atoms are the basic building block of nature. D) An atom is the smallest identifiable unit of an element. E) All of the above statements are true.
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E
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Which statement below accurately describes the contributions of Democritus? A) ancient Greek philosopher who proposed that matter was not continuous B) created the modern periodic table C) proposed the modern Atomic Theory D) discovered the existence of electrons E) none of the above
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A
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Which statement below accurately describes the contributions of Dalton? A) ancient Greek philosopher who proposed that matter was continuous B) created the modern periodic table C) proposed the modern Atomic Theory D) discovered the existence of electrons E) none of the above
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C
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Which of the following is not part of Dalton's Atomic Theory? A) Each element is composed of tiny indestructible particles called atoms. B) All atoms of a given element have the same mass and other properties that distinguish them from the atoms of other elements. C) Atoms combine in simple, whole-number ratios to form compounds. D) Most of the atom's mass and all of its positive charge is contained in a small core called the nucleus. E) All of the above are part of the atomic theory.
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D
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Which statement below accurately describes the contributions of Thomson? A) ancient Greek philosopher who proposed that matter was continuous B) created the modern periodic table C) proposed the modern Atomic Theory D) discovered the existence of electrons E) none of the above
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D
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Which of the statements about the discovery of electrons is FALSE? A) Because atoms are neutral, the existence of a negatively charged particle implied there must be a positively charged component of an atom. B) Thomson proposed that electrons were small particles held within a positively charged sphere. C) Rutherford proved the plum-pudding model correct. D) The negatively charged electron is located outside the nucleus. E) All of the above statements are true.
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C
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Which statement below is NOT consistent with the nuclear theory of the atom as proposed by Rutherford? A) Most of the atom's mass and all of its positive charge is contained in a small core called the nucleus. B) Electrical charge is a fundamental property of protons and electrons in which like charges repel and opposite charges attract. C) Most of the volume of the atom is empty space occupied by tiny, negatively charged electrons. D) There are as many electrons outside the nucleus as there are protons inside the nucleus in a neutral atom. E) All of the above statements are consistent.
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B
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Which statement reflects the results of Rutherford's gold foil experiments? A) Most all of the alpha particles were deflected back in the direction from which they came. B) Many alpha particles sputtered gold atoms off of the surface of the foil. C) Many alpha particles were deflected while passing through the foil. D) Most all of the alpha particles passed directly through the foil. E) none of the above
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D
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The atomic mass unit is defined as: A) the mass of the hydrogen atom containing only one proton. B) the mass of electrons found in a carbon atom containing six protons and neutrons. C) 1/12 the mass of a carbon atom containing six protons and six neutrons. D) 1/14 the mass of a nitrogen atom containing 7 protons and 7 neutrons. E) none of the above
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C
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Which of the following statements about the nature of electrical charge is FALSE? A) Electrical charge is a fundamental property of protons and electrons. B) Positive and negative electrical charges attract each other. C) Positive-positive or negative-negative charges repel each other. D) Positive and negative charges cancel each other so that a proton and electron, when paired, are charge neutral. E) All of the above statements are true.
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E
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Which of the following subatomic particles has a mass of 1.66 x10-24? A) electrons only B) protons only C) neutrons only D) protons and neutrons E) none of the above
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D
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Which of the following elements has an atomic number of 4? A) H B) C C) He D) Be E) none of the above
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D
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Which of the following elements has only 12 protons? A) C B) Zn C) Mg D) O E) none of the above
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C
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What is the atomic symbol for silver? A) S B) Ag C) Au D) Si E) none of the above
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B
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What is the atomic symbol for tin? A) Sn B) Ti C) Tn D) Si E) none of the above
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A
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What is the correct chemical symbol for mercury? A) Hm B) Hy C) Me D) My E) none of the above
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E
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Which of the following is not a correct name, symbol combination? A) beryllium, Be B) magnesium, Mg C) iron, I D) manganese, Mn E) silicon, Si
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C
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Which of the following is not a correct name, symbol combination? A) beryllium, Be B) phosphorus, P C) iron, Fe D) manganese, Mg E) silicon, Si
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D
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Which of the following is not a correct name, symbol combination? A) calcium, Ca B) gold, Au C) manganese, Mn D) chromium, Cr E) potassium, P
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E
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The names of the elements whose symbols are Si, P, Mn, and S are respectively, A) silicon, potassium, magnesium, and sulfur. B) silver, phosphorus, magnesium, and sulfur. C) silicon, phosphorus, manganese, and sulfur. D) silicon, phosphorus, magnesium, and sulfur. E) silicon, potassium, magnesium, and sodium.
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C
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Metals are located where on the periodic table? A) left side B) right side C) middle D) zig-zag diagonal line E) none of the above
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A
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Nonmetals are located where on the periodic table? A) left side B) right side C) middle D) zig-zag diagonal line E) none of the above
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B
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Metalloids are located where on the periodic table? A) left side B) right side C) middle D) zig-zag diagonal line E) none of the above
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D
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Group 1A elements are also called: A) noble gases. B) halogens. C) alkaline earth metals. D) alkali metals. E) none of the above
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D
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Group 1A elements are also called: A) noble gases. B) halogens. C) alkaline earth metals. D) alkali metals. E) none of the above
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a
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Group 8A elements are also called: A) noble gases. B) halogens. C) alkaline earth metals. D) alkali metals. E) none of the above
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A
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Group 2A elements are also called: A) noble gases. B) halogens. C) alkaline earth metals. D) alkali metals. E) none of the above
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C
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Mg is a member of which family? A) noble gases B) halogens C) alkaline earth metals D) alkali metals E) none of the above
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C
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Xe is a member of which family? A) noble gases B) halogens C) alkaline earth metals D) alkali metals E) none of the above
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A
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Cr is a member of which family? A) noble gases B) halogens C) alkaline earth metals D) alkali metals E) none of the above
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E
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All of the following statements about different elements are true EXCEPT: A) Barium is an alkaline earth metal. B) Manganese is a transition metal. C) Sulfur is considered a metalloid. D) Krypton is one of the noble gases. E) Iodine is a halogen.
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C
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Identify the element that is a nonmetal, a gas, and has an elemental symbol that starts with the letter "A". A) Ac B) Ar C) Au D) Al E) none of the above
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B
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Ions are formed when atoms A) gain or lose protons B) gain or lose electrons C) gain or lose neutrons D) Each of these results in ion formation E) None of these results in ion formation
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B
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When an atom loses an electron, the resulting particle is called A) a proton B) an anion C) a cation D) an isotope E) none of the above
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C
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When an atom gains an electron, the resulting particle is called A) a proton B) an anion C) a cation D) an isotope E) none of the above
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B
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Which of the following statements about ions is INCORRECT? A) Cations are positive ions and anions are negative ions. B) Cations are formed when an atom loses electrons. C) Anions are formed when an atom gains electrons. D) Cations are formed when an atom gains protons. E) All statements are correct.
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D
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What is the correct formula for a potassium ion with 18 electrons? A) P+ B) K+ C) K- D) P- E) none of the above
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B
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How many electrons are in Br-? A) 4 B) 7 C) 34 D) 36 E) none of the above
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D
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How many protons and electrons are present in O2-? A) 8 protons and 8 electrons. B) 10 protons and 8 electrons. C) 8 protons and 10 electrons. D) 16 protons and 8 electrons. E) none of the above
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C
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What is the charge on the barium ion? A) 1- B) 2- C) 1+ D) 2+ E) none of the above
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D
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What is the charge on the ion formed by selenium? A) 1- B) 2- C) 1+ D) 2+ E) none of the above
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B
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What is the charge on the cesium ion? A) 1- B) 2- C) 1+ D) 2+ E) none of the above
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C
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How many electrons would be in a -2 charged anion of sulfur? A) 2 B) 16 C) 18 D) 36 E) none of the above
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C
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Isotopes are: A) atoms of the same element that have different number of neutrons. B) atoms of the same element that have different number of protons. C) atoms of the same element that have different number of electrons. D) atoms of the same element that have the same number of neutrons. E) none of the above
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a
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The nucleus of an atom consists mainly of A) neutrons and electrons. B) protons and electrons. C) protons and neutrons. D) protons, neutrons, and electrons E) none of the above
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C
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How many neutrons are present in Ne-22? A) 12 B) 10 C) 22 D) 32 E) none of the above
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A
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How many neutrons are present in C-14? A) 14 B) 12 C) 6 D) 8 E) none of the above
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D
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What is the mass number of the hydrogen isotope that contains 2 neutrons? A) 1 B) 2 C) 3 D) 4 E) none of the above
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C
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How many protons and neutrons are in Cl-37? A) 20 protons, 17 neutrons B) 17 protons, 37 neutrons C) 17 protons, 20 neutrons D) 37 protons, 17 neutrons E) none of the above
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C
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An atom of a carbon-14 isotope would contain A) 6 protons, 8 neutrons,and 6 electrons. B) 8 protons, 6 neutrons,and 8 electrons. C) 6 protons, 8 neutrons,and 8 electrons. D) 14 protons, 6 neutrons,and 6 electrons. E) 20 protons, 6 neutrons,and 20 electrons.
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A
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An atom that has the same number of neutrons as is A) B) C) D) E) none of the above
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D
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A specific isotope of an element is known to have 15 protons and 16 neutrons. Which symbol would properly represent this isotope? A) B) C) D) E) none of the above
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B
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A fictional element has two isotopes, each making up 50% of the population. Isotope 1 has a mass of 80.0 amu, Isotope 2 has a mass of 85.0 amu. Calculate the atomic mass of the fictional element. A) 82.5 amu B) 42.5 amu C) 40 amu D) 165 amu E) none of the above
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A
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A fictional element has two isotopes and an atomic mass of 87.08 amu. If the first isotope is 86 amu and the second isotope has a mass of 90 amu. Which isotope has the greatest natural abundance? A) 86 amu B) 90 amu C) There are equal amounts. D) Not enough information provided. E) none of the above
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A
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Chlorine has two stable isotopes, Cl-35 and Cl-37. If their exact masses are 34.9689 amu and 36.9695 amu, respectively, what is the natural abundance of Cl-35? (The atomic mass of chlorine is 35.45 amu) A) 75.95% B) 24.05% C) 50.00% D) 35.00% E) 37.00%
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A
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When elements combine to form compounds, A) their properties are an average of all elements in the compound. B) their properties change completely. C) their properties do not change. D) their properties are completely random. E) none of the above
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B
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The first chemist to formally state the law of constant composition was ________. A) Dalton B) Mendeleev C) Rutherford D) Proust E) none of the above
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D
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The law of constant composition states: A) Matter cannot be either created or destroyed in a chemical reaction. B) The nucleus is a dense region of positive charge that always contains protons and neutrons. C) All samples of a given compound have the same proportions of their constituent elements. D) All atoms of a given element have a constant composition and are different than atoms of any other element. E) none of the above
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C
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The oxygen-to-hydrogen mass ratio of water is always 8.0 is an example of what fundamental law? A) Law of Constant Composition B) Law of Constant Mass Ratio C) Law of Conservation of Mass D) Law of Constant Whole Number Ratio E) none of the above
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A
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What is the oxygen-to-hydrogen mass ratio for H2O2? A) 0.125 B) 4 C) 8 D) 16 E) none of the above
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D
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What is the oxygen-to-sulfur mass ratio of sulfur dioxide? A) 0.5 B) 1.0 C) 2.0 D) 16 E) none of the above
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B
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Which of the following statements about chemical formulas is FALSE? A) The subscripts represent the relative number each type of atom in the compound. B) The subscripts represent the relative mass of each type of atom in the compound. C) The subscripts do not change for a given compound. D) Different compounds made of the same elements have different subscripts. E) All of the statements are true.
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B
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How many total atoms are in the formula Al2(CO3)3? A) 8 B) 9 C) 12 D) 14 E) none of the above
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D
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How many carbon atoms are in the formula Al2(CO3)3? A) 3 B) 9 C) 1 D) 6 E) none of the above
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A
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How many oxygen atoms are in the formula Al2(CO3)3? A) 3 B) 9 C) 1 D) 6 E) none of the above
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B
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How many of each type of atoms are there in the formula NH4C2H3O2? A) N = 4, H = 7, C = 2, O = 2 B) N = 1, H = 4, C = 2, O = 2 C) N = 1, H = 3, C = 2, O = 2 D) N = 1, H = 7, C = 2, O = 2 E) none of the above
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D
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How many of each type of atom are there in the formula Ca3(PO4)2? A) Ca = 3, P = 1, O = 4 B) Ca = 3, P = 2, O = 4 C) Ca = 3, P = 2, O = 8 D) Ca = 3, P = 1, O = 8 E) none of the above
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C
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) How many of each type of atom are there in the formula (NH4)2HPO4? A) N = 2, H = 9, P = 1, O = 4 B) N = 1, H = 5, P = 1, O = 4 C) N = 2, H = 5, P = 1, O = 4 D) N = 2, H = 8, P = 1, O = 4 E) none of the above
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A
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What is the correct formula for a compound that has three oxygen atoms and one sulfur atom? A) O3S B) SO3 C) 3OS D) SO3 E) none of the above
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B
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What is the correct formula of a compound that has ten oxygen atoms and four phosphorus atoms? A) O10P4 B) 10OP4 C) 4PO10 D) P4O10 E) none of the above
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D
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) Carbon is considered which of the following? A) atomic element B) molecular element C) molecular compound D) ionic compound E) none of the above
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A
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Which among the following elements does not exist as a diatomic molecule in nature? A) hydrogen B) nitrogen C) fluorine D) neon E) none of the above
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D
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Carbon monoxide is considered which of the following? A) atomic element B) molecular element C) molecular compound D) ionic compound E) none of the above
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C
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Fluorine is considered which of the following? A) atomic element B) molecular element C) molecular compound D) ionic compound E) none of the above
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B
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Ammonium fluoride is considered which of the following? A) atomic element B) molecular element C) molecular compound D) ionic compound E) none of the above
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D
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Which of the following species is a molecular element? A) neon B) sulfur C) chlorine D) carbon dioxide E) none of the above
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C
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Which of the following is a molecular compound? A) barium sulfide B) calcium acetate C) potassium hydroxide D) nitrogen monoxide E) none of the above
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D
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What is the formula for an ionic compound made of barium and nitrogen? A) ba3n2 B) Ba2N3 C) BaN D) Ba2N4 E) none of the above
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A
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) What is the formula for an ionic compound made of magnesium and sulfur? A) MgS B) MgS2 C) Mg2S D) Mg2S3 E) none of the above
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A
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What is the formula for an ionic compound made of carbon and oxygen? A) CO2 B) C2O C) CO D) CO3 E) Carbon and oxygen do not form an ionic compound.
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E
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What is the formula for an ionic compound made of aluminum and oxygen? A) AlO2 B) Al2O3 C) Al3O2 D) AlO E) none of the above
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B
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What is the name of the ionic compound made of beryllium and chlorine? A) beryllium(II) chloride B) beryllium dichloride C) beryllium chloride D) monoberyllium dichloride E) none of the above
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c
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What is the name of the compound made from lithium and oxygen? A) lithium dioxide B) lithium(I) oxide C) oxygen lithide D) lithium oxide E) none of the above
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d
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) What is the name of CoS? A) cobalt(II) sulfide B) cobalt sulfide C) cobalt monosulfide D) cobaltous sulfur E) none of the above
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A
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hat is the name of Ca (NO3)2? A) calcium dinitrite B) calcium nitrate C) calcium nitride D) calcium nitrite E) none of the above
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B
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Choose the pair of names and formulas that do not match. A) magnesium nitrite: Mg(NO2)3 B) calcium carbonate: CaCO3 C) aluminum sulfate: Al2(SO4)3 D) sodium hydrogen carbonate: NaHCO3 E) potassium hydroxide: KOH
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A
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Choose the pair of names and formulas that do not match. A) strontium carbonate: SrCO3 B) ammonium cyanide: NH4CN C) potassium acetate: KC2H3O2 D) calcium nitrate: Ca(NO3)2 E) lithium sulfate: LiSO4
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E
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What is the name of the compound whose formula is Na2O? A) sodium monoxide B) disodium oxide C) disodium monoxide D) sodium oxide E) none of the above
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D
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What is the correct formula for potassium dichromate? A) K(CrO4)2 B) KCr2O7 C) K2CrO4 D) K2Cr2O7 E) none of the above
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D
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What is the correct formula for ammonium hydrogen sulfate? A) NH4HSO4 B) (NH4)2HSO4 C) (NH4)2SO4 D) Am2HSO4 E) none of the above
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A
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The formula for potassium chlorate is KClO3. The formula for magnesium chloride is MgCl2. What is the formula for magnesium chlorate? A) MgClO3 B) Mg2ClO3 C) Mg(ClO3)2 D) Mg2(ClO3)3 E) none of the above
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C
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What is the correct formula for the hypochlorite polyatomic ion? A) B) C) D) E) none of the above
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A
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What is the name of the molecular compound SF5? A) sulfur hexafluoride B) sulfur heptafluoride C) monosulfur tetrafluoride D) sulfur pentafluoride E) none of the above
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D
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What is the name of the molecular compound SO3? A) sulfur oxide B) sulfur(IV) oxide C) sulfur trioxide D) sulfur tetraoxide E) none of the above
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C
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What is correct name of the compound whose formula is N2O4 ? A) nitrogen dioxide B) nitrogen tetroxide C) dinitrogen oxide D) dinitrogen tetroxide E) none of the above
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D
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What is correct name of the compound whose formula is BF3 ? A) boron trifluoride B) boron fluoride C) monoboron trifluorine D) boron(III) fluoride E) none of the above
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A
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What would the formula of diiodine pentasulfide be? A) I5S2 B) I2S5 C) I4S9 D) I2S7 E) none of the above
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B
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What is the correct formula for the molecular compound heptaphosphorus octafluoride? A) P5F8 B) P 7F6 C) P6F7 D) P7F8 E) none of the above
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D
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What is the proper name for HBr? A) hydrobromous acid B) hydrousbromic acid C) hydrobromic acid D) bromous acid E) none of the above
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C
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What is the name of HI? A) hydroiodous acid B) hydroiodic acid C) iodic acid D) iodous acid E) none of the above
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B
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What is the name of HIO3? A) iodic acid B) hydroioidic acid C) hydroiodous acid D) iodous acid E) none of the above
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A
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What is the name of HNO2? A) Nitric acid B) Nitrous acid C) hydronitrous acid D) hydronitric acid E) none of the above
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B
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A certain oxyacid is derived from the oxyanion . The formula for the oxyacid is A) H2SO4 B) HSO3 C) H2SO3 D) H3SO3 E) none of the above
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C
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What is the formula mass of sulfurous acid? A) 82.08 amu B) 98.08 amu C) 83.09 amu D) 66.08 amu E) none of the above
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A
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What is the formula mass for potassium nitrate? A) 92.99 amu B) 117.11 amu C) 85.11 amu D) 101.10 amu E) none of the above
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D
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What is the formula mass for diboron tetrachloride? A) 127.98 amu B) 198.89 amu C) 234.34 amu D) 163.43 amu E) none of the above
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D
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Which of the following has the largest formula mass? A) CO2 B) SO2 C) NO2 D) SiO2 E) H2O
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B
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Which of the following compounds have the smallest formula mass? A) CO2 B) SO2 C) NO2 D) SiO2 E) H2O
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E
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What is the formula mass of copper(II) fluoride? A) 101.55 B) 146.10 C) 90.00 D) 165.10 E) none of the above
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A
