Classic Classic Quiz Midterm Exam Review 1 by Ceiteagakactag Ceiteagakactag 18 played - 10 yrs ago Chemistry QUIZ 30 QUESTIONS expert Chemistry 1 The mass of a mole of NaCl is the? Molar MassAtomic MassMolecular MassGram Atomic Mass 2 What is the molar mass of (NH4)2CO3? 144 g138 g96 g78 g 3 The volume of one mole of a substance is 22. 4 L at STP for all ___. GasesLiquidsSolidsCompounds 4 What is the number of moles in 9. 63 L of H2S gas at STP? 0. 1040. 4303. 5414. 7 5 What is the percent composition of chromium in BaCrO4? 4. 87%9. 47%20. 5%25. 2% 6 The lowest whole-number ratio of the elements in a compound is called the ___. Empirical formulaMolecular formulaBinary formulaRepresentative formula 7 A catalyst is ___. The product of a combustion reactionNot used up in a reactionOne of the reactants in single-replacement reactionsA solid product of a reaction 8 Chemical equations must be balanced to satisfy ___. The law of definite proportions.The law of multiple proportionsThe law of conservation of massAvogadro's principle 9 Which of the following statements is NOT true about what happens in all chemical reactions? The ways in which atoms are joined together are changed.New atoms are formed as products.The starting substances are called reactants.The bonds of the reactants are broken and new bonds of the products are formed. 10 What is the change in atomic number caused by the emission of gamma radiation? Decreases by 2Decreases by 1Remains the sameIncreases by 1 11 If an isotope decays by the process of beta emission, ___. The mass number changesThe atomic number changesProtons are given offThe number of neutrons remains the same 12 Controlled nuclear chain reactions ___. Take place in nuclear reactorsAre a, ways fusion reactantsNever produce radioactive by-productsAre characteristic of atomic bombs 13 Which of the following statements is correct? Water is used to moderate neutrons in a nuclear reactor.Carbon control rods are used to absorb neutrons in a nuclear fission reaction.A very high temperature is required to initiate a nuclear fission reaction.The energy released from the sun is the result of a nuclear fission reaction. 14 How many moles of silver atoms are in 1. 8x10^20 atoms of silver? 3. 0x10^-43. 3x10^-33. 0x10^21. 1x10^44 15 How many atoms are in 3. 5 moles of arsenic atoms? 5. 8x10^-24 atoms7. 5x10^1 atoms2. 1x10^24 atoms1. 7x10^23 atoms 16 A molecule with a single covalent bond is ___. Co2Cl2CON2 17 What is the shape of a molecule with a triple bond? TetrahedralPyramidalMetalLinear 18 What is the correct names for the N^3- ion? Nitrate ionNitrogen ionNitride ionNitrite ion 19 Which of the following is true about the composition of ionic compounds? They are composed of anions and cations.They are composed of anions only.They are composed of cations only.They are formed from two or more nonmetallic elements. 20 What type of compound is CuSO4? Monotomic ionicPolyatomic covalentPolyatomic ionicBinary molecular 21 What is the correct formula for a calcium dihydrogen phosphate? Cah2po4Ca2h2po4Ca(h2po4)2Ca(h2hpo4)2 22 Which of the following is NOT a representative particle? AtomCationAnionAll of the above 23 Which combination of temp. and pressure correctly describes standard temp. and pressure, STP? 0 Celcius and 101 kPa1 Celcius and 0 kPa0 Celsius and 22. 4 kPa100 Celsius and 100 kPa 24 Which of the following gas samples would have the largest number of representative particles at STP? 12. 0 L He7. 0 l o20. 10 L Xe0. 007 l so3 25 Symbols used in equations, together with the explanations of the symbols, are shown below. Which set is correct? (g), grams(l), liters(aq), dissolved in water(s), solid product 26 Of the following elements, which one has the smallest first ionization energy? BoronCarbonAluminumSilicon 27 How does calcium obey the octet rule when reacting to form compounds? It gains electrons.It gives up electrons.It does not change its number of electrons.Calcium does not obey the octet rule. 28 Which is a typical characteristic of an ionic compound? Electron pairs are shared among atoms.The ionic compound has a low solubility in water.The ionic compound is described as a molecule.The ionic compound has a high melting point. 29 Which noble gas has the same electron configuration as the oxygen in a water molecule? HeliumNeonArgonXenon 30 What is the approximate frequency of a photon having an energy 5x10^-24 J? 8x10^9 Hz3x10^-57 Hz3x10^-58 Hz1x10^-10 Hz A mistake in this Quiz ? Contact the author Commentaires
