1) What is the name given to the element with the symbol "K"? A) Potassium B) Krypton C) Phosphorus D) Kallium

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1 Practice Exam 1 (Chapters 1-4) Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) What is the name given to the element with the symbol "K"? 1) A) Potassium B) Krypton C) Phosphorus D) Kallium 2) By what chemical symbol do we know the element magnesium? 2) A) Mn B) Ma C) Mg D) M 3) Which of the following represents a chemical change? 3) A) sugar dissolving into hot coffee B) steel turning to rust in salt air C) ice melting to form liquid water D) water boiling to form steam 4) Which of the following represents a physical change? 4) A) barbecuing a steak B) burning a propane camping stove C) adding electricity to water to produce hydrogen and oxygen gas D) chopping a piece of wood 5) Which of the following is an example of a heterogenous mixture? 5) A) seawater B) chicken noodle soup C) milk D) steel 6) The only way one can change an element to another is via. 6) A) a nuclear reaction B) a chemical reaction C) a physical reaction D) applying heat 7) Which of the following is a pure substance? 7) A) tap water B) orange juice C) blood D) block of aluminum 8) How many significant figures are there in , 7000, and ? 8) A) 4, 1, 1 B) 7, 1, 4 C) 6, 4, 4 D) 3, 1, 4 9) Which of the following correctly converts mi in scientific notation? 9) A) mi B) mi C) mi D) mi 1

2 10) The closest number of grams that is equivalent to lb is. 10) A) B) C) 338 D) ) Which value below properly expresses the number in scientific notation? 11) A) B) C) D) ) How many significant digits are there in the number ? 12) A) 5 B) 3 C) 6 D) 4 13) g is equivalent to. 13) A) 465,000 mg B) 4.65 kg C) kg D) 465,000 ng 14) Which of the following is not an SI unit that is used in chemistry? 14) A) kg B) quart C) K D) s 15) If the speed limit is 120 km/hr, its equivalent in mi/hr is. 15) A) 133 B) 210 C) 75 D) ) Which of the following does not measure temperature? 16) A) degrees Fahrenheit B) K C) J D) degrees centigrade 17) The density of a 4.0 cm3 sample of a metal is 11.3 g/ml. What is the density of 8.0 cm3 sample of 17) the same metal? A) 11.3 g/ ml B) 2.0 g/ ml C) 5.65 g/ ml D) 22.6 g/ ml 18) The density of aluminum is 2.7 g/ml. This is equivalent to kg/m3. 18) A) 0.27 B) C) 2.7 D) ) Which statement is true? 19) A) 1 cm3 = 1 ml B) 1 g = lb C) 1 mm = in D) All of the above are true. 20) Which is the lowest temperature? 20) A) 40 C B) 313 K C) 104 F D) All of them are about the same. 21) The sum for the operation is. 21) A) 16 B) 16.4 C) D)

3 22) By how many places must the decimal point of the number be moved in order to express 22) this same number in a standard scientific notation? A) 4 B) 5 C) 6 D) 7 23) 100 cal of heat are added to 10 g of ethanol (0.581 cal/g C) originally at 15 C. The final temperature 23) is. A) 17 C B) 27 C C) 32 C D) 38 C 24) Which of the following operations will give an answer of 50.1? 24) A) B) C) D) all of the above 25) 80.0 g of metal A occupy 20.0 ml, while 56.0 g of metal B occupy 14.0 ml. The conclusion may 25) draw is. A) A and B are the same metal B) A and B are not the same metal C) A and B may be the same metal, but more studies are needed to decide if they are the same D) The above results tell us nothing about the nature of A and B. 26) How many Joules are in kcal? 26) A) J B) J C) J D) J 27) Which of the following temperatures are not possible? 27) A) 5 K B) -425 C C) 2000 C D) -425 F 28) According to the experiments of Ernest Rutherford, where can a majority of a given atom's mass be 28) found? A) in concentric layers of spherical shape B) scattered randomly throughout an approximately cube-shaped atom C) as small pieces orbiting a common center in circular paths D) at the center of an approximately spherical atom 29) How many protons does the nucleus of the sulfer-35 isotope have? 29) A) 19 B) 32 C) 16 D) 35 30) The structure of individual atoms can roughly be described as. 30) A) a massive, positively charged center and mostly empty space B) massive, positively charged pieces in orbit around a low-mass, negatively charged center C) positively charged, low-mass pieces in orbit around a massive, negatively charged center D) an even mixture of mass and charge scattered throughout a spherical shape 3

4 31) Which of the following terms applies to the horizontal rows found on a periodic table? 31) A) Arrangement B) Isotope C) Period D) Group 32) Which of the following is a metalloid in the third period of the periodic table? 32) A) Si B) S C) Al D) P 33) Ionization energy as one goes down a group and as one goes from left to right in 33) a period. A) decreases; increases B) increases; decreases C) increases; increases D) decreases; decreases 34) Which of the following elements can have an anion with 18 electrons? 34) A) Fe B) Cl C) Sc D) Ar 35) How many electrons are found in a Fe+3 ion? 35) A) 29 B) 26 C) 56 D) 23 36) Which has more electrons? 36) A) Sr+2 B) Br- C) Rb D) As+3 37) Which is expected to be the most chemically similar element to phosphorus? 37) A) As B) S C) O D) Se 38) Which of the following is a metal? 38) A) W B) As C) Xe D) C 39) Which element is found in the fourth group and fifth period? 39) A) Te B) Ge C) Br D) Sn 40) Which species has 16 protons, 18 neutrons and 18 electrons? 40) A) 34S+2 B) 36Ar+2 C) 34S-2 D) 36Se-2 41) A metal is an element that tends to valence electrons in chemical reactions, becoming a(n) 41) in the process. A) lose; cation B) gain; cation C) lose; anion D) gain; anion 42) The likely formula of the compound formed between Al and S is. 42) A) Al2S B) Al3S2 C) AlS2 D) Al2S3 4

5 43) The relative ratio of atoms in the binary compound AlxOy is. 43) A) x= 5, y=2 B) x= 2, y=5 C) x= 2, y=3 D) x= 3, y=2 44) Predict the formula of the compound produced in a reaction between barium (Ba) and oxygen (O). 44) A) Ba 2 O 3 B) Ba 2 O C) BaO 2 D) BaO 45) What is the mass in grams of 1 mole of P 2 O 5? 45) A) g B) g C) g D) g 46) What is the percentage by mass of iron (Fe) in the mineral hematite (Fe 2 O 3 )? 46) A) 70% B) 40% C) 30% D) 60% 47) The number of oxygen atoms in 1 mole Al2(SO4)3 is. 47) A) 3 B) 4 C) 12 D) none of the above 48) A sample of calcium that contains Avogadro's number of atoms has a mass of. 48) A) 40 g B) 80 g C) 20 g D) 160 g 49) Which of the following pairs does not share the same empirical formula? 49) A) CH2O and C3H6O3 B) C3H4Br2 and C9H12O6 C) C2H6O and CH3O D) C6H6 and C2H2 50) Which compound has the following % composition Al= 15.8%, 28.1% S and 56.1% O? 50) A) Al2(SO4)3 B) Al2(S2O3)3 C) Al2S3 D) Al2(SO3)3 51) The mass of oxygen present in 11.7 g Al2(CO3)3 is. 51) A) 14.4 g B) 4.0 g C) 7.2 g D) 8.1 g 52) A compound has the following elemental composition: C= 58.8%, H= 13.8%, N= 27.4%. The 52) empirical formula of this compound is. A) C5H14N2 B) C5H10N2 C) C5H15N2 D) C5H14N 5

6 53) To prepare 100mL 0.4M HCl from a stock solution of 2M HCl one needs to. 53) A) use 500 ml 2M HCl and boil it down to a final volume of 100 ml solution B) dilute 20 ml 2 MHCl with enough water to make a total volume of 100 ml solution C) dilute 20 ml 2M HCl with 100 ml HCl D) dilute 80 ml 2M HCl to a total volume of 100 ml solution 54) 200 ml a 0.1M NaCl contains g NaCl. 54) A) 117 B) 5.85 C) 11.7 D) ) How many grams of NaCl are in 200 g of a 10% salt solution? 55) A) 20 B) 80 C) 40 D) 10 6