Benchmark Test - Answer Key

ravy Ht05wtv Name' Cla55 Date-L __ ';/~t(tl 5. Which of the following is a correct conversion factor? 8. As you are heating a beaker of an unknown substance your in;tructor asks if the substance is giving off an odor. Which procedure should you follow to safely determine if the substance has an odor? 0dmIJO~;;) Dan has three identical containers_ In the center of the bottom of each container he cuts out a circular hole and places a plug in each hole. The diameter of each hole varies, 10 em, 20 em, and 30 em. He fills the first container with water, removes the plug, and measures and records the amount of time it takes for the water to drain completely out of the container_ He repeats this process for the other two cohtainers. 1. Identify the question that Dan is most likely trying to answer using the experiment. 3. A scientist wants to determine if the age of a dog affects its ability to smell. Which of the following statements is ~met~ other ~a hypothesis for this questIOn? A A dog's ability to smell decreases with rage. V I B As a dog ages, its ability to smell intensifies. t' dogs have the ability to smell. . D The age of a dog has no affect on Its ability to smell. lOOmm/] 1 kg/] x 10'5 mg m 7- D 1000 cm'/] kL A - C ..,"' 'C;;.(, v "'" 7_ For a lab experiment, you are to mix a bElrlUnl compound, soluble in water~ with an excess amount of sulfuric acid. The goal of the experiment is 10 i'lelermine the percentage of barium in the compollnd_ ~ U ~ Wear safety goggles when handling or bases. Do not use equipment with damaged electrical cords . .~ Use an electric hOI plate instead of al1 open l1ame. 'B Wash hands thoroughly before hnncHing any sofid chemicals. I i I~ 1/ 2. Which hypothesis might Dan have made before he began his experiment? G A The smaller the hole, the more amount of water the container will hold. The holes in containers 1, 2, and 3 should be 10 em, 20 em, and 30 em in diameter, respectively. . ("'The larger the hole, the fas,ter the water VWill drain out of the contamer. D Water will drain at a different rate than other liquids. 5. Chlorine boils at 239 K. What is the boiling point of chlorine expressed in degrees celsius? A 93°C B 34°C C ·-61°(: S / Benchmark Test 1 ED Wha! should yOll do as a safety procedure before you begm tlus lab expeJlment) A Taste the sample materials B Remove YOUl safety goggles. Get out a lire blanket. I I 6 I\ I ~ Wave the fumes from the beaker your nose_ 9. You are getting ready to stan a lab experimeJJ1 involving baking powder, corn starch, vinegar, and water The lab has these symbols above the procedure description. V acids .~ Tul'l1off the heat source and sit for 10 minutes. V toward Identify the safety rille that is most applicable to this experiment. (;;;:) Does the size of a hole ~ffect the drainage rate of a contamer? B Does the type of container affect the way water drains out of the hOllom'! C How fast does water drain out of three containers? D Which container holds the greatest amount of water? Pick lip the beaker and let your lab partner smell it. B Put on your safety goggles and place YOllrnose over the beaker. l'\,~.~ 'v '\ r i) d).A.!l I S':",/ Yl S,· ..;JP B C C € Put on gloves S~J tv 0 larne-----...-.-.-------.---Ip. Class Which of the foJJowing is not a part of Dalton's atomic theory? Date 13, Thomson's plum-pudding model describes an atom as: neutral lTwteriaI wilh negatively charged electrons scattered throughout. positively charged material with negatively charged electrons scattered thrpughout negatively charged material with negmively charged electrons spaced evenly throughout. ' A All elements arc composed of atoms. B Atoms of the same element are alike, @ Atoms are always in motion, D _ Atoms that combine do so in simple whole-number ratios. 15_ Thomson performed an experiment where he discovered that cathode rays are deflected by a magnet and atl~'acted by a positively charged plate, What did this prove about the particles that make up the rays'l A They have a greater mass. B They are neutraL ( ~ 18_ The Bohr model, although historically important, was limited in its abilily to explain the behavior of more complex elements and ions. To which of the follOWing atoms or ions would you expect fj" the Bohr model to apply? r"~ ,'8-. He+ - Likes attract likes. C K They are negatively charged, D 10'" Ca positively charged material with neutral elcctrons throughout A negatively charged and has a low density, B negatively charged and has a high density, C positively charged and has a low density, l'OI positively charged and has a high V density, Dalton theorized thai atoms are indivisible and that all atoms of an element are identicaL Scientists now know that: A Dalton's theories are completely correct .. B atoms of an element can have different numbers of protons, €) D atoms are all divisible, all atoms of an element are not identical but they all have the same mass, 16_ Bohr's contriblHjontQ the deve]Qpment of atomic structure: 14. Robert A. Millikan contributed to the current atomic theory by discovering which of the following? A was referred to as the "plum pudding model." 1. electron charg(..) 1.1. the de<:tron was the discovery that electrons surround a dense nucleus. proposed that electrons travel in circular orbits around Ihe nucleus, Ill, the lllass of an electron is the quantum mechanical modeL A I and II B II and ]]] €}' J and Jl] D 19, The quantum mechanical model of the atom: l' 0 ~,y iS concerned with the probability of finding an electron in a certain position, B was proposed by Neils Bohr. ( defines the ex::,clpath of an electron around the nucleus, o has many analogies in the visible world, 20. Which besi describes how the Bohr model differs from the quantum mechanical model of the alom? J.ll.andJJl Bohr proposed that 3n electron is found only in around the nucleus of an atom. A the charged areas B the magnetic field D random areas etJ circular pallerns A {~The quantum mode] does not define an the electrons take around the nucleus, V exact pattern B The quantum model is based on fixed energy levels of electrons, C The Bohr model restricts the energy of electrons to certain values. D The Bohr model uses probability to determine the location of finding an electron around the nucleus, r------ I. - 34. Which property is identical in the two electromagnetic waves represented by the drawings below? Melting Point fOC) Sllbst~nce. 37. According to Hund's rule, the first three electrons that enter into p orbitals mllS! have: ® e parallel spins. opposite spins. low energy levels. o opposite charges. B o Water ~~~~ -101 Mercury --OXyge:~2 32. Hg -39 ---------1 -218 mercury ~ JVWJ\t I QCJ!i11QlitudC') C energy D wavelength 35. The wavelength of light with a frequency 2.50 x lOt" s·1 is: of A 3.1'2 the various colors of autumn leaves o steam from hot pavement [~Topl What method would you use to locate an electron in a certain position around an atom if your theory was based on the quantum mechanicall11odel? C A (I. Electrons have a mass of 1 amu. The nucleus of an atom is positively charged. D -'~eutrons are found in the nucleus of an atom. Find the charge of the atom .. the ~"robabilitY. A 51 energy levels. (£> atomic number. D neutrons. B (B"74) 'c-ro2 D 125 ,-:\I sulfur, oxygen C D sodium, silver, oxygen 31 25. The number of proLOns in the nucleus of an atom of a specific element is the same as that element's: A atomic mass. nitrogen, sodium, sulfur, oxygen neon, silver, oxygen (£)28 C 58.7 D 86.7 s Name the elements that form the compound NaS04' (]) B What is the total number oj"subatomic particles (protons, electrons, and neutrons) in an atom ofvanadium-51~ Me, S"-::fF 30. A Electrons have a negative charge. C A Draw a picture. S Calculate the energy lost. ~stimate 27. What is the atomic number of this element? 31. All of the following are physical properties of water EXCEPT: A boiling point of lODGe 2'8. Choose the correct formula for calcium hydrogen phosphate. <2l B CaHP04 CaZHP04 C Ca(H2P04h B colorless liquid C able to dissolve table salt Q) separates into hydrogen and oxygen D Ca(HP04h /4et.r' /f,-t, r, The number of neutrons in the nucleus of an atom can be calculated by: A adding together the number of electrons and protons. E subtracting the number of protons from the number of electrons. ~ubtracting the number of protons from V;he mass number. D adding the mass number to the number of protons. 26. What is the atomic number and the mass number of an atom with]] protons and 12 neutrons? A atomic number = ]] and mass number = 12 atomic number = 12 and mass number = 11 atomic number = 1] and mass number = 23 D atomic number = 23 and mass number = ] 2 B ~ 0 9 £ 29. Which element is paired with the correct symbol? ~ ~ A Neon,N i B Gold, Go Chon, I ® Boron,B J "~ j g ..,'. ~ o. " 27. What is the atomic number of this element? What method would you use to locate an electron in a certain position around an atom if your theory was based on the quantum mechanical model? e A A Electrons have a negative charge. Electrons have a mass of 1 amu. The nucleus of an atom is positively charged. D "14eutrons are found in the nucleus of an alom. Find the charge of the atom .. A 51 (B""'74) 'cro2 B 31 e 58.7 A atomic mass. B energy levels. D neutrons. <£> atomic number. D adding the mass number to the number of protons. D Cable l3. Choose the correct formula for calcium hydrogen phosphate. <2J CaHP04 D Ca(HP04)2 A*,~~ A adding together the number of electrons and protons. B subtracting the number of protons from the number of electrons. mubtracting the number of protons from V;he mass number. A boiling point of 100 C B colorless liquid B Ca2HP04 C Ca(H2P04h &11 26. What is the atomic number and the mass number of an atom with] J protons and ]2 neutrons? A atomic number = 1 J and mass number = J2 II atomic number = 12 and mass number = 11 atomic number = ]] and mass number = 23 D atomic number = 23 and mass number = 12 sodium, silver, oxygeJ] 31. All of the following are physical properties of water EXCEPT: 25. The number of pro Ions in the nucleus of an atom of a specific element is the same as that element's: D 125 The number of neutrons in the nucleus of an atom can be calculated by: D r5J 28 D 86.7 4f sodium, sulfur, oxygen C neon, silver, oxygen Nickel 58.7 the ~~obability. What is the total number of subatomic particles (protons, electrons, and neutrons) in an atom of vanadium-51 ~ M (,\S S" nitrogen, sulfur, oxygen (J) (j$ e A Draw a picture. S Calculate the energy los!. ~Estimate Name the elements that fonn the compound NaS04. 30. 29. Which element is paired with the correct symbol? A Neon,N B Gold,Go C Iron, I ~ Boron, B ~ lO dissolve table salt s'eparales into hydrogen and oxygen