General Chem Exam 2

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.

2) 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

3) 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

4) 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.

5) 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

6) 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.

7) 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.

8) 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

9) 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

10) 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.

11) 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

12) Which of the following elements has an atomic number of 4? A) H B) C C) He D) Be E) none of the above

13) Which of the following elements has only 12 protons? A) C B) Zn C) Mg D) O E) none of the above

14) What is the atomic symbol for silver? A) S B) Ag C) Au D) Si E) None of the above

15) What is the atomic symbol for tin? A) Sn B) Ti C) Tn D) Si E) none of the above

16) What is the correct chemical symbol for mercury? A) Hm B) Hy C) Me D) My E) none of the above

17) 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

18) 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

19) 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

20) 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.

21) 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

22) 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

23) 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

24) Group 1A elements are also called: A) noble gases. B) halogens. C) alkaline earth metals. D) alkali metals. E) none of the above

25) Group 7A elements are also called: A) noble gases. B) halogens. C) alkaline earth metals. D) alkali metals. E) none of the above

26) Group 8A elements are also called: A) noble gases. B) halogens. C) alkaline earth metals. D) alkali metals. E) none of the above

27) Group 2A elements are also called: A) noble gases. B) halogens. C) alkaline earth metals. D) alkali metals. E) none of the above

28) Mg is a member of which family? A) noble gases B) halogens C) alkaline earth metals D) alkali metals E) none of the above

29) Xe is a member of which family? A) noble gases B) halogens C) alkaline earth metals D) alkali metals E) none of the above

30) Cr is a member of which family? A) noble gases B) halogens C) alkaline earth metals D) alkali metals E) none of the above

31) 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.

32) 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

33) 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

34) 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

35) 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

36) 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.

37) 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

38) How many electrons are in Br-? A) 4 B) 7 C) 34 D) 36 E) none of the above

39) 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

40) What is the charge on the barium ion? A) 1- B) 2- C) 1+ D) 2+ E) none of the above

54) 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

53) Which of the following compounds have the smallest formula mass? A) CO2 B) SO2 C) NO2 D) SiO2 E) H2O

52) Which of the following has the largest formula mass? A) CO2 B) SO2 C) NO2 D) SiO2 E) H2O

39) 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

40) 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

1) 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

2) 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

3) 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

4) 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

5) What is the oxygen-to-hydrogen mass ratio for H2O2? A) 0.125 B) 4 C) 8 D) 16 E) none of the above

6) 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

7) 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.

8) How many total atoms are in the formula Al2(CO3)3? A) 8 B) 9 C) 12 D) 14 E) none of the above

9) How many carbon atoms are in the formula Al2(CO3)3? A) 3 B) 9 C) 1 D) 6 E) none of the above

10) How many oxygen atoms are in the formula Al2(CO3)3? A) 3 B) 9 C) 1 D) 6 E) none of the above

11) 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

16) Carbon is considered which of the following? A) atomic element B) molecular element C) molecular compound D) ionic compound E) none of the above

18) 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

25) 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.

30) What is the name of Ca (NO3)2? A) calcium dinitrite B) calcium nitrate C) calcium nitride D) calcium nitrite E) none of the above

31) 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