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Exam 961-1st Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which of the following gives the correct numbers of protons, neutrons, and electrons in a neutral atom of 118 Sn? 50 A) 118 protons, 50 neutrons, 118 electrons B) 50 protons, 50 neutrons, 50 electrons C) 118 protons, 118 neutrons, 50 electrons D) 50 protons, 68 neutrons, 50 electrons E) 68 protons, 68 neutrons, 50 electrons Answer: D Page Ref: 2) The mass number of iron is __________. A) 26 B) 56 C) 55.85 D) 29.85 E) 27.78 Answer: B Page Ref: 3) Protons, neutrons, and electrons are examples of __________. A) ions B) metals C) subatomic particles D) elements E) compounds Answer: C Page Ref: 4) A 100.0 g sample of eighteen karat gold is contains 75.0 g of gold and 25.0 g of other metals. What is the percent of gold in the sample? A) 75.0% B) 25.0% C) 50% D) 100.0% E) 125% Answer: A Page Ref: 5) The density of a solution is 1.18 g/L, and its volume is 25.0 mL. The mass of the sample is __________. A) 25.0 g B) 1.18 g C) .0472 g D) 0.0295 g E) 21.2 g Answer: D Page Ref: 6) In the following reaction, what is the correct coefficient for aluminum chloride? Al + Cl2 A) 1 AlCl3 B) 2 C) 3 Answer: B Page Ref: 1 D) 4 E) 5 7) The compound MgCl2 is named __________. A) magnesium chloride B) dimagnesium chloride C) magnesium dichloride D) magnesium chlorine E) magnesium (II) chloride Answer: A Page Ref: 8) What is the formula of a compound that contains Na+ and PO4 3- ions? A) Na3PO4 B) Na3PO3 C) Na3P D) NaPO4 E) Na2PO3 Answer: A Page Ref: 9) Which element would have physical and chemical properties similar to chlorine? A) Ar B) Br C) P D) S E) O Answer: B Page Ref: 10) According to the Atomic Theory, A) a compound can contain different numbers of atoms as long as it has the same kinds of atoms. B) atoms of different element combine to form compounds. C) all atoms are different. D) all matter is made up of tiny particles called electrons. E) atoms are created and destroyed during a chemical reaction. Answer: B Page Ref: 11) Ca is the symbol for __________. A) cobalt B) cadmium C) copper D) calcium E) carbon Answer: D Page Ref: 12) One distinguishing physical property of the element mercury is __________. A) it does not conduct electricity B) it is a liquid at room temperature C) it has a dull, blackish appearance D) it is less dense than water E) it is soluble in water Answer: B Page Ref: 13) A neutron has an electrical charge of __________. A) +1 B) -2 C) -1 Answer: E Page Ref: 2 D) +2 E) 0 14) Which of the following examples illustrates a number that is correctly rounded to three significant figures? A) 103.692 grams to 103.7 grams B) 109 526 grams to 109 500 grams C) 0.03954 grams to 0.040 grams D) 4.05438 grams to 4.054 grams E) 20.0332 grams to 20.0 grams Answer: E Page Ref: 15) What is the symbol for the ion with 19 protons and 18 electrons? A) Ar+ B) FC) F+ D) K- E) K+ Answer: E Page Ref: 16) When gold is melted and formed in a mold to make a piece of jewelry, what type of change is taking place? A) boiling B) a physical change C) a chemical change D) a change of size E) evaporation Answer: B Page Ref: 17) CFCs are broken down in the atmosphere by __________. A) ozone B) UV light C) nitrogen dioxide D) iron E) AIDS Answer: B Page Ref: 18) How many electrons will aluminum gain or lose when it forms an ion? A) lose 1 B) gain 5 C) gain 1 D) lose 3 E) lose 2 Answer: D Page Ref: 19) What is the correct formula for the oxide ion? A) O3+ B) O C) O2+ D) O+ E) O2- Answer: E Page Ref: 20) A chemical equation is balanced when A) the total number of ions is the same in reactants and products. B) the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products. C) the number of atoms of each element is the same in reactants and products. D) the charge on each atom is the same in reactants and products. E) the total number of molecules is the same in reactants and products. Answer: C Page Ref: 3 21) Significant figures are important because they indicate __________. A) the number of digits in a measurement B) the number of measurements C) the number of digits on a calculator D) a counted number E) the accuracy of the conversion factor Answer: A Page Ref: 22) Which of the following gives the balanced equation for this reaction? K3 PO4 + Ca(NO3 )2 Ca3(PO4 )2 + KNO3 A) K3 PO4 + Ca(NO3 )2 B) 2 K3 PO4 + Ca(NO3)2 Ca3(PO4 )2 + KNO3 Ca3(PO4)2 + 6KNO3 E) 2K3PO4 + 3Ca(NO3 )2 Ca3 (PO4)2 + 6KNO 3 C) KPO4 + CaNO3 + KNO3 Ca3(PO4 )2 + 3KNO3 D) K3 PO4 + Ca(NO3 )2 Answer: E Page Ref: 23) How many centimeters are there in 57.0 in? A) 22.4 cm B) 140 cm C) 145 cm D) 22 cm Answer: C Page Ref: 24) The measurement 0.0000043 m, expressed correctly using scientific notation, is __________. A) 4.3 m B) 4.3 × 10-7 m C) 4.3 × 10-6 m D) 4.3 × 106 m E) 0.43 × 10-5 m Answer: C Page Ref: 25) Which of the following is a chemical change? A) bending a steel rod B) melting gold C) burning sugar D) making a snowman E) cutting a rope Answer: C Page Ref: 4 E) 0.0445 cm 26) One mol of particles of any substance contains how many particles? A) 3 × 1010 B) 3 × 10-10 C) 6.022 × 1023 D) 106 E) 6.022 × 10-23 Answer: C Page Ref: 27) Which of the following elements is a noble gas? A) nitrogen B) oxygen C) argon D) chlorine E) bromine Answer: C Page Ref: 28) Which of the following is an example of a physical change? A) converting water to hydrogen and oxygen B) grinding coffee beans C) burning coal D) baking a cake E) digesting a cheeseburger Answer: B Page Ref: 29) Which of the quantities below has the largest mass? A) 2 mol of carbon B) 2 mol of lithium metal C) 5 mol of hydrogen gas D) 5 mol of aluminum metal E) 6 mol of helium gas Answer: D Page Ref: 30) Which of the following descriptions of a subatomic particle is correct? A) A proton has a positive charge and a mass of approximately 1 amu. B) A neutron has no charge and its mass is negligible. C) A proton has a positive charge and a negligible mass. D) An electron has a negative charge and a mass of approximately 1 amu. E) A neutron has a positive charge and a mass of approximately 1 amu. Answer: A Page Ref: 31) Which of the following is the basic unit of volume in the metric system? A) meter B) gram C) liter D) kilogram Answer: C Page Ref: 5 E) centimeter 32) What is the Celsius temperature that equals to 86 degree Fahrenheit? A) 20 B) 18 C) 25 D) 40 E) 30 D) 5210 m E) 0.00521 km Answer: E Page Ref: 33) 5.21 cm is the same distance as __________. A) 0.0521 m B) 5.21 mm C) 52.1 dm Answer: A Page Ref: 34) Which of the following polyatomic ions has a positive charge? A) nitrate B) hydroxide C) ammonium D) hydrogen carbonate E) cyanide Answer: C Page Ref: 35) Water, H2O, is an example of a(n) __________. A) element B) chemical C) electric charge D) solid E) wave Answer: B Page Ref: 36) Isotopes are atoms of the same element that have __________. A) the same atomic mass but different numbers of protons B) the same atomic numbers but different numbers of protons C) the same atomic numbers but different numbers of electrons D) the same atomic number but different numbers of neutrons E) different atomic numbers Answer: D Page Ref: 6 37) Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O2 to the number of moles of Fe2O3 produced? 4Fe + 3O2 A) B) 2Fe2 O3 3 mol O2 2 mol Fe2 O3 2 mol Fe2 O3 4 mol Fe C) 4 mol Fe 2 mol Fe2 O3 D) 4 mol Fe 3 mol O2 E) 2 mol Fe2 O3 3 mol O2 Answer: E Page Ref: 38) The mass number of an atom can be calculated from the __________. A) number of electrons plus protons B) number of protons C) number of electrons D) number of neutrons E) number of protons plus neutrons Answer: E Page Ref: 39) The number of neutrons in an atom is equal to the __________. A) mass number + the atomic number B) atomic number C) mass number D) mass number - the atomic number E) number of protons Answer: D Page Ref: 40) When a firecracker explodes, giving off light and heat, and breaking the wrapper into many pieces, __________. A) a physical change takes place B) both a physical and a chemical change are taking place C) a chemical change takes place D) the wrapper evaporates into a gas E) the fuse undergoes a physical change only Answer: B Page Ref: 7 41) Sodium is an example of an element that is a __________. A) nonmetal B) transition element C) metal D) metalloid E) noble gas Answer: C Page Ref: 42) The correct symbol for the isotope of potassium with 22 neutrons is __________. 19 22 41 37 K K K P A) B) C) D) 41 19 19 15 E) 15 P 37 Answer: C Page Ref: 43) When 2.50 mol of Mg3N2 are allowed to react, how many moles of H2 O also react? Mg3 N2 + 6H2 O 3Mg(OH)2 + 2NH3 A) 6.00 mol B) 15.0 mol C) 9.00 mol D) 1.25 mol E) 2.50 mol D) tin E) neon Answer: B Page Ref: 44) The element that corresponds to the symbol Ni is __________. A) nickel B) nitrogen C) sodium Answer: A Page Ref: 45) Avogadro's number is the number of A) amu in 1 mol of a substance. B) grams in 1 mol of a substance. C) particles in 1 mol of a substance. D) moles in 6.022 × 1023 amu of an element. E) moles in 6.022 × 1023 grams of an element. Answer: C Page Ref: 46) What elements are in hydroxyapatite, Ca5 (PO4)3OH , a major compound in human bones and teeth? A) carbon, potassium, oxygen, helium B) carbon, phosphorus, oxygen, helium C) carbon, potassium, oxygen, hydrogen D) calcium, phosphorus, oxygen, helium E) calcium, phosphorus, oxygen, hydrogen Answer: E Page Ref: 8 47) Which of the following is a characteristic of nonmetals? A) low melting points B) good conductors of electricity C) malleable D) shiny E) good conductors of heat Answer: A Page Ref: 48) Calculate the molar mass of magnesium chloride, MgCl2. A) 70.01 g B) 24.31 g C) 125.91 g D) 59.81 g Answer: E Page Ref: 49) A hydrocarbon branch off either a carbon chain or a carbon ring is often called an A) alpha particle B) alkyl bond C) alkyl group D) alkyl force E) alcohol Answer: C Page Ref: 50) In an atom, the nucleus contains __________. A) only neutrons B) all the protons and neutrons C) only protons D) all the protons and electrons E) an equal number of protons and electrons Answer: B Page Ref: 9 E) 95.21 g