General Chemistry Test 1 2022

Test 1 General Chemistry CH115 Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) If matter is uniform throughout, cannot be separated into other substances by physical processes, but can be decomposed into other substances by chemical processes, it is called a (an) __________. A) element B) homogeneous mixture C) compound D) heterogeneous mixture E) mixture of elements 1) 2) The symbol for the element potassium is __________. A) Ca B) K C) P D) S E) Pt 2) 3) The SI unit of temperature is __________. A) °C B) K D) T E) t C) °F 3) 4) The density of silver is 10.5 g/cm3 . A piece of silver that occupies a volume of 23.6 cm3 would have a mass of __________g. A) 2.25 B) 23.6 C) 0.445 D) 248 E) 112 4) 5) The number 0.00430 has __________ significant figures. A) 6 B) 4 C) 2 5) D) 5 E) 3 6) The correct result (indicating the proper number of significant figures) of the following addition is __________. 12 1.2 0.12 + 0.012 6) A) 13 B) 13.3 C) 13.33 D) 13.332 E) none of the above 7) There are __________ significant figures in the answer to the following computation: 7) (29.2 - 20.0) (1.79 × 105) 1.39 A) 1 B) 2 C) 3 D) 4 1 E) 5 8) Methane and ethane are both made up of carbon and hydrogen. In methane, there are 12.0 g of carbon for every 4.00 g of hydrogen, a ratio of 3:1 by mass. In ethane, there are 24.0 g of carbon for every 6.00 g of hydrogen, a ratio of 4:1 by mass. This is a statement of the law of __________. A) conservation of matter B) conservation of mass C) octaves D) multiple proportions E) constant composition 8) 9) Which statement below correctly describes the responses of alpha, beta, and gamma radiation to an electric field? A) Both beta and gamma are deflected in the same direction, while alpha shows no response. B) Only alpha is deflected, while beta and gamma show no response. C) Alpha and beta are deflected in opposite directions, while gamma shows no response. D) Both alpha and gamma are deflected in the same direction, while beta shows no response. E) Both alpha and beta are deflected in the same direction, while gamma shows no response. 9) 10) Which pair of atoms constitutes a pair of isotopes of the same element? 14 14 X X A) 6 7 B) 14 X 6 12 X 6 C) 19 X 10 19 X 9 D) 20 X 10 21 X 11 E) 17 X 9 17 X 8 10) 11) The element __________ is the most similar to strontium in chemical and physical properties. A) Li B) Cs C) Ba D) At E) Rb 11) 12) Elements in Group 2A are known as the __________. A) noble gases B) alkali metals C) halogens D) alkaline earth metals E) chalcogens 12) 13) When a metal and a nonmetal react, the __________ tends to lose electrons and the __________ tends to gain electrons. A) nonmetal, metal B) metal, metal C) nonmetal, nonmetal D) metal, nonmetal E) None of the above, these elements share electrons . 13) 14) What is the formula of the compound formed between strontium ions and nitrogen ions? A) Sr2N3 B) SrN C) SrN3 D) Sr3 N2 E) SrN2 14) 2 15) The correct formula for molybdenum(IV) hypochlorite is __________. A) Mo(ClO4)4 B) Mo(ClO3)4 15) 16) If matter is uniform throughout and cannot be separated into other substances by physical means, it is __________. A) either an element or a compound B) a heterogeneous mixture C) a compound D) an element E) a homogeneous mixture 16) 17) Which of the following are chemical processes? 1. rusting of a nail 2. freezing of water 3. decomposition of water into hydrogen and oxygen gases 4. compression of oxygen gas A) 1, 2 B) 2, 3, 4 C) 1, 4 17) C) MoCl4 D) Mo(ClO)4 E) Mo(ClO2)4 D) 1, 3, 4 E) 1, 3 18) Precision refers to __________. A) how close a measured number is to the true value B) how close a measured number is to infinity C) how close a measured number is to zero D) how close a measured number is to the calculated value E) how close a measured number is to other measured numbers 18) 19) Which one of the following is not one of the postulates of Dalton's atomic theory? A) All atoms of a given element are identical; the atoms of different elements are different and have different properties. B) Atoms of an element are not changed into different types of atoms by chemical reactions: atoms are neither created nor destroyed in chemical reactions. C) Atoms are composed of protons, neutrons, and electrons. D) Compounds are formed when atoms of more than one element combine; a given compound always has the same relative number and kind of atoms. E) Each element is composed of extremely small particles called atoms. 19) 20) The gold foil experiment performed in Rutherford's lab __________. A) utilized the deflection of beta particles by gold foil B) confirmed the plum-pudding model of the atom C) led to the discovery of the atomic nucleus D) was the basis for Thompson's model of the atom E) proved the law of multiple proportions 20) 3 21) There are __________ electrons, __________ protons, and __________ neutrons in an atom of 132 Xe. 54 21) A) 78, 78, 132 B) 78, 78, 54 C) 54, 54, 78 D) 54, 54, 132 E) 132, 132, 54 22) In the modern periodic table, the elements are arranged in __________. A) order of increasing neutron content B) reverse alphabetical order C) alphabetical order D) order of increasing atomic number E) order of increasing metallic properties 22) 23) The net ionic equation for formation of an aqueous solution of NiI2 accompanied by evolution of C O2 gas via mixing solid NiCO3 and aqueous hydriodic acid is __________. 23) A) NiCO3 (s) + 2HI (aq) B) NiCO3 (s) + 2HI (aq) C) 2NiCO3 (s) + HI (aq) D) NiCO3 (s) + I- (aq) E) NiCO3 (s) + 2H+ (aq) H2 O (l) + CO2 (g) + Ni2+ (aq) + 2I- (aq) 2H2O (l) + CO2 (g) + NiI2 (aq) 2H2O (l) + CO2 (g) + 2Ni2+ (aq) 2H2 O (l) + CO2 (g) + Ni2+ (aq) + HI (aq) H2O (l) + CO2 (g) + Ni2+ (aq) 24) Which of the following is soluble in water at 25°C (room temperature)? A) Fe(OH)2 B) FeS C) FeCO3 D) Fe(NO3 )2 E) Fe3 (PO4)2 24) 25) Which combination will produce a precipitate? A) NaCl (aq) and HC2 H3 O2 (aq) B) NH4 OH (aq) and HCl (aq) 25) 26) Which one of the following is a weak acid? A) HCl B) HF C) HNO3 26) C) NaOH (aq) and Fe(NO3 )2 (aq) D) AgNO3 (aq) and Ca(C2H3 O2 )2 (aq) E) NaOH (aq) and HCl (aq) D) HClO4 E) HI 27) The balanced reaction between aqueous nitric acid and aqueous strontium hydroxide is __________. Sr(NO3)2 (aq) + H2 (g) A) HNO3 (aq) + Sr(OH)2 (aq) Sr(NO3 )2 (aq) + 2H2 (g) B) 2HNO3 (aq) + Sr(OH)2 (aq) H2O (l) + SrNO3 (aq) C) HNO3 (aq) + SrOH (aq) D) 2HNO3 (aq) + Sr(OH)2 (aq) E) HNO3 (aq) + Sr(OH)2 (aq) 2H2 O (l) + Sr(NO3 )2 (aq) H2 O (l) + Sr(NO3 )2 (aq) 4 27) ESSAY. Write your answer in the space provided or on a separate sheet of paper. 28) For a new element, 68.84% is an isotope with mass 280.7 amu, 2.40% is an isotope with mass 283.5 amu, and 28.76% is an isotope with mass 284.7 amu. Calculate the average atomic mass of this new element. 29) A compound was found to contain 90.6% lead (Pb) and 9.4% oxygen. The empirical formula for this compound is __________. 5 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 30) In which species does sulfur have the highest oxidation number? A) S8 (elemental form of sulfur) 30) B) K2 SO4 C) SO2 D) H2 S E) H2 SO3 31) Which of the following is an oxidation-reduction reaction? AgCl (s) + HNO3 (aq) A) AgNO3 (aq) + HCl (aq) 31) 2HNO3 (aq) + CaCO3 (s) B) H2 CO3 (aq) + Ca(NO3 )2 (aq) H2O (l) + NaCl (aq) C) HCl (aq) + NaOH (aq) D) Cu (s) + 2AgNO3 (aq) 2Ag (s) + Cu(NO3 )2 (aq) E) Ba(C2H3 O2 )2 (aq) + Na2 SO4 (aq) BaSO4 (s) + 2NaC2 H3O2 (aq) 32) Based on the activity series, which one of the reactions below will occur? 3Fe (s) + 2AuBr3 (aq) A) 3FeBr2 (aq) + 2Au (s) B) 2AgNO3 (aq) + Pb (s) C) SnCl2 (aq) + Cu (s) 2Ag (s) + Pb(NO3 )2 (aq) Sn (s) + CuCl2 (aq) ZnI2 (aq) + Mn (s) D) Zn (s) + MnI2 (aq) 3Hg(NO3 )2 + 2Cr (s) E) 3Hg (l) + 2Cr(NO3)3 (aq) 6 32) ESSAY. Write your answer in the space provided or on a separate sheet of paper. 33) How many grams of carbon di oxide can form by the complete combustion of 4 . 95 gram ethylene and 3 . 25 g oxygen by the following unbalanced reaction: C2 H 4 (g ) O2 (g) H2 O --> 7 (l) + CO2 (g)