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Chemistry First Semester Practice Exam Batten NAME Chemistry First Semester Practice Exam Multiple Choice Questions 1) What is the approximate total number of atoms in 1.0 mole of lithium? 23 (a) 1.0 × 10 (b) 6.0 × 1023 (c) 3.0 (d) 6.9 2) In which list can all particles be accelerated by an electric field? (a) alpha particles, beta particles, and neutrons (b) alpha particles, beta particles, and protons 5) Given the nuclear equation: 14 16 2 N+X→ O+ H 7 8 1 What is particle X? (a) an alpha particle (c) a deuteron (b) a beta particle (d) a triton 6) Which type of radiation is most similar to high-energy x rays? (c) alpha particles, protons, and neutrons (d) beta particles, protons, and neutrons 3) Which reaction is matched correctly with the particle represented by letter X ? (a) 226 222 Ra → Rn + X; X is an alpha particle. 88 86 (b) 234 Th → 90 234 Pa + X; X is an alpha particle. 91 (c) 230 226 Th → Ra + X; X is a beta particle. 90 88 (d) 234 230 U → Th + X; X is a beta particle. 92 90 (a) alpha (c) neutron (b) beta (d) gamma 7) Which type of bond exists between an atom of carbon and an atom of fluorine? (a) ionic (c) polar covalent (b) metallic (d) nonpolar covalent 8) At which location in the Periodic Table would the most active metallic element be found? (a) in Group 1 at the top (b) in Group 1 at the bottom (c) in Group 17 at the top 4) Within Period 2 of the Periodic Table, as the atomic number increases, the atomic radius generally (a) decreases (b) increases (d) in Group 17 at the bottom (c) remains the same 9) Given the reaction: 2C2 H2 (g) + 5O2 (g) → 4CO2 (g) + 2H2 O(g) What is the total number of grams of O2 (g) needed to react completely with 0.50 mole of C2 H2 (g)? (a) 10. g (c) 80. g (b) 40. g (d) 160 g 16) 24 grams of carbon equals how many moles? 10) Given the unbalanced equation: N2 (g) + O2 (g) → N2 O5 (g) When the equation is balanced using smallest whole numbers, the coefficient of N2 (g) will be (a) 1 (b) 2 (a) (b) (c) (d) 1 2 3 4 (c) 5 (d) 4 17) Which properties are most common in nonmetals? 11) Which atom will form an ionic bond with a Br atom? (a) low ionization energy and low electronegativity (b) low ionization energy and high electronegativity (a) N (b) Li (c) O (d) C 12) Which atoms are isotopes of the same element? (a) 24 25 X and X 12 12 (b) 20 20 X and X 10 11 (c) 31 32 X and X 15 16 (d) 31 31 X and X 19 19 (c) high ionization energy and low electronegativity (d) high ionization energy and high electronegativity 18) Which shows the correct Lewis structure for H2 O? (a) H O H H (b) O H 13) Given the equation: H2 (g) + Cl2 (g) → 2HCl(g) What is the total number of moles of HCl(g) produced when 3 moles of H2 (g) is completely consumed? (a) 5 moles (b) 2 moles (d) H O H H O H (c) 3 moles (d) 6 moles 14) According to the periodic table, which of the following elements most readily loses an electron? (a) (b) (c) (d) (c) F Ne Li C 19) The forces between atoms that create chemical bonds are the result of interactions between (a) nuclei (b) electrons (c) protons and electrons (d) protons and nuclei 20) Which molecule exhibits covalent bonding? 15) What is the total number of neon atoms contained in 20.2 grams of neon gas? (a) 1.01 × 1024 (b) 2.02 × 1024 (c) 3.01 × 1023 (d) 6.02 × 1023 (a) (b) (c) (d) LiF CO2 KBr CaCl2 21) Which pair of atoms is held together by a covalent bond? (a) HCl (b) LiCl 26) How are protons held together in the nucleus of an atom? (a) Nuclear forces (b) Electromagnetic attraction (c) NaCl (d) KCl (c) Electromagnetic repulsion (d) Rotational inertia 22) Given the reaction: 226 222 Ra → Rn + X 88 86 Which type of emanation is represented by X? (a) alpha particle (c) proton (b) beta particle (d) positron 27) As the elements of Group l are considered in order from top to bottom, the first ionization energy of each successive element will (a) decrease (b) increase 23) Which list is in order of increasing penetrating strength? (a) Alpha, gamma, beta 28) What is the total number of molecules in a 0.5-mole sample of He gas? (a) 6 × 1023 (b) 2 × 1023 (b) Alpha, beta, gamma (c) remain the same (c) 3 × 1023 (d) 4 × 1023 (c) Gamma, alpha, beta (d) Gamma, beta, alpha 29) Which elements are both classified as metalloids? 24) The atomic mass unit is defined as exactly of an atom of 1 12 (a) 12 C 6 (c) 24 Mg 12 (b) 14 C 6 (d) 26 Mg 12 the mass (a) Ge and As (b) Bi and Po 30) Which pair of atoms will share electrons when a bond is formed between them? (a) Ba and I (b) Br and CI 25) In a salt crystal, NaCl, how does the number of positive sodium ions compare with the number of negative chloride ions? (a) The number of positive ions is less than the number of negative ions. (b) The number of positive ions is more than the number of negative ions. (c) The number of positive ions is equal to the number of negative ions. (c) B and C (d) Si and P (c) K and CI (d) Li and I 31) Which bond exists between the atoms in a water molecule? (a) (b) (c) (d) Ionic Covalent Ionic and covalent Hydrogen (d) It depends on the particular crystal. 32) Which particles may be gained, lost, or shared by an atom when it forms a chemical bond? (a) protons (c) neutrons (b) electrons (d) nucleons 33) Which element in Group 1 has the greatest tendency to lose an electron? (a) cesium (c) potassium (b) rubidium (d) sodium 34) Given the reaction: 4Al(s) + 3O2 (g) → 2Al2 O3 (s) What is the minimum number of grams of oxygen gas required to produce 1.00 mole of aluminum oxide? (a) 32.0 g (c) 96.0 g (b) 48.0 g (d) 192 g 40) In which set do the elements exhibit the most similar chemical properties? (a) N, O, and F (b) Hg, Br, and Rn (c) Li, Na, and K (d) Al, Si, and P 41) Which subatomic particle is found in the nucleus of all isotopes of hydrogen? (a) proton (c) electron (b) neutron (d) positron 42) In the equation 234 234 Th → Pa + X the symbol 90 91 X represents 35) What is the total number of valence electrons in an atom of boron in the ground state? (a) 1 (b) 7 (c) 3 (d) 5 36) What is the total number of protons and neutrons in 86 an atom of Rb? 37 (a) 37 (b) 49 (c) 86 (d) 123 37) Which type of radiation has zero mass and zero charge? (a) alpha (c) neutron (b) beta (d) gamma 38) The elements known as the alkaline earth metals are found in Group (a) 1 (b) 2 (c) 16 (d) 17 39) Atoms of which element have the weakest attraction for electrons? (a) Na (b) P (c) Si (d) S (a) 0 e +1 (c) 1 n 0 (b) 0 e −1 (d) 1 H 1 43) What is the total number of moles of sulfur atoms in 1 mole of Fe2 (SO4 )3 ? (a) 1 (b) 15 (c) 3 (d) 17 44) Given the unbalanced equation. CaSO44 + AlCl3 → Al2 (SO4 )3 + CaCl2 What is the coefficient of Al2 (SO4 )3 when the equation is completely balanced using the smallest wholenumber coefficients? (a) 1 (b) 2 (c) 3 (d) 4 45) Atoms of which set of elements all exhibit the same oxidation state? (a) (b) (c) (d) actinoid series metalloids alkaline earth metals transition metals 46) Which noble gas has the highest first ionization energy? (a) radon (b) krypton (c) neon (d) helium 47) Which statement explains why fusion reactions are difficult to initiate? (a) Positive nuclei attract each other. (b) Positive nuclei repel each other. (c) Neutrons prevent nuclei from getting close enough to fuse. (d) Electrons prevent nuclei from getting close enough to fuse. 48) Which statement describes the elements in Period 3? 49) Which electron dot symbol represents the atom in Period 4 with the highest first ionization energy? (a) (c) (b) (d) 50) If M represents an alkali metal, what is the formula for the compound formed by M and oxygen? (a) MO2 (b) M2 O (c) M2 O3 (d) M3 O2 51) What is the charge and mass of a proton? (a) Each successive element has a greater atomic radius. (b) Each successive element has a lower electronegativity. (c) charge of -1 and mass of 1 amu (c) All elements have similar chemical properties. (d) charge of -1 and mass of (d) All elements have valence electrons in the same principal energy level. (a) charge of +1 and mass of 1 amu (b) charge of +1 and mass of 1 1836 1 1836 amu amu Chemistry First Semester Practice Exam Batten Answer Key Multiple Choice Questions 1) b 2) b 3) a 4) a 5) a 6) d 7) c 8) b 9) b 10) b 11) b 12) a 13) d 14) c 15) d 16) b 17) d 18) d 19) c 20) b 21) a 22) a 23) b 24) a 25) c 26) a 27) a 28) c 29) a 30) b 31) b 32) b 33) a 34) b 35) c 36) c 37) d 38) b 39) a 40) c 41) a 42) b 43) c 44) a 45) c 46) d 47) b 48) d 49) d 50) b 51) a