Unit 3 Exam

Unit 3 ExamReviewQuestion 1Daltons atomic theory was accepted becauseA. There was evidence to support it.B. Democritus said that it was correctC. Dalton invented the electron microscopeD. Dalton showed how molecules are formedQuestion 1Daltons atomic theory was accepted becauseA. There was evidence to support it.B. Democritus said that it was correctC. Dalton invented the electron microscopeD. Dalton showed how molecules are formedQuestion 2Atoms are neutral (no net electric charge) when theyA. have an equal number of charged and non-charged particlesB. have neutrons in their nucleiC. have an equal number of electrons and protonsD. have an equal number of neutrons and protons Question 2Atoms are neutral (no net electric charge) when theyA. have an equal number of charged and non-charged particlesB. have neutrons in their nucleiC. have an equal number of electrons and protonsD. have an equal number of neutrons and protons Question 3The atomic theory of the ancient Greek philosopher Democritus was revised because

A.it claimed matter is made of atoms.C.it explained what electrons are.B.it claimed atoms could be divided.D.scientists found new evidence.Question 3The atomic theory of the ancient Greek philosopher Democritus was revised because

A.it claimed matter is made of atoms.C.it explained what electrons are.B.it claimed atoms could be divided.D.scientists found new evidence.Question 4A.Atoms cannot be divided.B.Atoms of an element are alike.C.Atoms are made of electrons.D.Atoms of different elements form compounds.In 1803 Dalton was the first person to develop an atomic theory based on lab experiments. Which of these statements is not part of Daltons atomic theory?Question 4A.Atoms cannot be divided.B.Atoms of an element are alike.C.Atoms are made of electrons.D.Atoms of different elements form compounds.In 1803 Dalton was the first person to develop an atomic theory based on lab experiments. Which of these statements is not part of Daltons atomic theory?Question 5A subatomic particle that has a negative charge is called a(n)A. moleculeB. electronC. elementD. compoundQuestion 5A subatomic particle that has a negative charge is called a(n)A. moleculeB. electronC. elementD. compoundQuestion 6A.thermal energy.C.electrical current and a sealed gas tubeB.kinetic energy.D.X rays.Thomson made his discovery about the atom during an experiment usingQuestion 6A.thermal energy.C.electrical current and a sealed gas tubeB.kinetic energy.D.X rays.Thomson made his discovery about the atom during an experiment usingQuestion 7What particle did Thomson discover?

A. nucleusB. electronC. protonD. neutron

Question 7What particle did Thomson discover?

A. nucleusB. electronC. protonD. neutron

Question 8Thompsons plum pudding (or chocolate chip ice cream) atomic model showed the atom:

A. as negative particles scattered in a positive massB. has a negatively charged nucleusC. as positive particles scattered in a negative massD. has neutrons and electronsQuestion 8Thompsons plum pudding (or chocolate chip ice cream) atomic model showed the atom:

A. as negative particles scattered in a positive massB. has a negatively charged nucleusC. as positive particles scattered in a negative massD. has neutrons and electronsQuestion 9By using his gold foil experiment, Rutherford was responsible for discovering that an atom containsA. electronsB. moleculesC. anodesD. nucleus

Question 9By using his gold foil experiment, Rutherford was responsible for discovering that an atom containsA. electronsB. moleculesC. anodesD. nucleus

Question 10A.Contains a small region with a highly concentrated negative charge.B.Contains a large region with a slight negative chargeC.Contains a small region with a highly concentrated positive charge.D.Contains a small region with a highly concentrated neutral charge.Rutherfords experiment produced evidence that the center of an atomQuestion 10A.Contains a small region with a highly concentrated negative charge.B.Contains a large region with a slight negative chargeC.Contains a small region with a highly concentrated positive charge.D.Contains a small region with a highly concentrated neutral charge.Rutherfords experiment produced evidence that the center of an atomQuestion 11A.electric charge.C.energy levelB.atomic mass.D.speed.According to Bohrs theory, an electrons path around the nucleus defines itsQuestion 11A.electric charge.C.energy levelB.atomic mass.D.speed.According to Bohrs theory, an electrons path around the nucleus defines itsQuestion 12A.Measuring the mass of different elements.C.Measuring the energy in different colors of light given off by excited atomsB.Knowing that neutrons are in the nucleusD.Knowing that protons are in the nucleus.Evidence to support Bohrs model comes from:Question 12A.Measuring the mass of different elements.C.Measuring the energy in different colors of light given off by excited atomsB.Knowing that neutrons are in the nucleusD.Knowing that protons are in the nucleus.Evidence to support Bohrs model comes from:Question 13A.Protons have a positive charge.B.A nucleus has a positive charge.C.Neutrons have no charge.D.Neutrons have a negative charge.Which of the following statements not true?Question 13A.Protons have a positive charge.B.A nucleus has a positive charge.C.Neutrons have no charge.D.Neutrons have a negative charge.Which of the following statements not true?Question 14Which of these particles could be a neutron?A. Particle AB. Particle BC. Particle C

Question 14Which of these particles could be a neutron?A. Particle AB. Particle BC. Particle C

Question 15Which of these particles could be an electron?A. Particle AB. Particle BC. Particle C

Question 15Which of these particles could be an electron?A. Particle AB. Particle BC. Particle C

Question 16Which of these particles could be an proton?A. Particle AB. Particle BC. Particle C

Question 16Which of these particles could be an proton?A. Particle AB. Particle BC. Particle C

Question 17A.protons and neutronsC.only neutronsB.only protons D.anodesWhat is an atoms nucleus made of?Question 17A.protons and neutronsC.only neutronsB.only protons D.anodesWhat is an atoms nucleus made of?Question 18The atomic mass of the element shown above would be:A.9B. 17C. 25D. 8

Question 18The atomic mass of the element shown above would be:A.9B. 17C. 25D. 8

Question 19The atomic number of the element shown above would be:A.9B. 17C. 25D. 8

Question 19The atomic number of the element shown above would be:A.9B. 17C. 25D. 8

Question 20An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have?A. 30B. 56C. 26D. 82

Question 20An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have?A. 30B. 56C. 26D. 82

Question 21A.protons.C.nucleiB.neutrons.D.protons and neutrons.An elements atomic number is equal to its number ofQuestion 21A.protons.C.nucleiB.neutrons.D.protons and neutrons.An elements atomic number is equal to its number ofQuestion 22A.numbers of neutrons.C.atomic numbers.B.numbers of protons.D.numbers of electrons.Two different isotopes of an element have differentQuestion 22A.numbers of neutrons.C.atomic numbers.B.numbers of protons.D.numbers of electrons.Two different isotopes of an element have differentQuestion 23What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons?

A. 19B. 20C. 39D. 58

Question 23What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons?

A. 19B. 20C. 39D. 58

Question 24Use a periodic table to answer this: A neutral sodium atom has how many electrons?A. 0B. 11C. 12D. 23

Question 24Use a periodic table to answer this: A neutral sodium atom has how many electrons?A. 0B. 11C. 12D. 23

Question 25A.the atom becomes charged.B.the atom becomes unstable.C.the electrons location is pinpointed.D.the atom gains or loses energy.An electron jumps to a new energy level whenQuestion 25A.the atom becomes charged.B.the atom becomes unstable.C.the electrons location is pinpointed.D.the atom gains or loses energy.An electron jumps to a new energy level whenQuestion 26The number of energy levels filled in an atom is determined by the number ofA. protonsB. electronsC. neutronsD. photonsQuestion 26The number of energy levels filled in an atom is determined by the number ofA. protonsB. electronsC. neutronsD. photonsQuestion 27A.The nucleus is made of protons and neutrons, and has a negative charge.B.The nucleus is made of protons and neutrons, and has a positive charge.C.The nucleus is made of electrons, and has a positive charge.D.The nucleus is made of electrons, and has a negative charge.Which statement about the atoms nucleus is correct?Question 27A.The nucleus is made of protons and neutrons, and has a negative charge.B.The nucleus is made of protons and neutrons, and has a positive charge.C.The nucleus is made of electrons, and has a positive charge.D.The nucleus is made of electrons, and has a negative charge.Which statement about the atoms nucleus is correct?Question 28A.eight neutrons in its nucleus.B.a total of eight protons plus neutrons.C.eight protons in its nucleus.D.a total of eight neutrons plus electrons.Oxygens atomic number is 8. This means that an oxygen atom hasQuestion 28A.eight neutrons in its nucleus.B.a total of eight protons plus neutrons.C.eight protons in its nucleus.D.a total of eight neutrons plus electrons.Oxygens atomic number is 8. This means that an oxygen atom hasQuestion 29A.It is determined by counting the number of isotopes in a sample of the element.B.It is equal to one-twelfth the mass of the most common isotope.C.It is a weighted average, so common isotopes have a greater effect than uncommon ones.D.It is based on an isotopes charge, so negatively charged isotopes have a greater effect than positive ones.Which statement about an elements average atomic mass is correct?Question 29A.It is determined by counting the number of isotopes in a sample of the element.B.It is equal to one-twelfth the mass of the most common isotope.C.It is a weighted average, so common isotopes have a greater effect than uncommon ones.D.It is based on an isotopes charge, so negatively charged isotopes have a greater effect than positive ones.Which statement about an elements average atomic mass is correct?Question 30A.protons plus the number of electrons.B.protons plus the number of neutrons.C.protons.D.neutrons.An atoms mass number equals the number of

Question 30A.protons plus the number of electrons.B.protons plus the number of neutrons.C.protons.D.neutrons.An atoms mass number equals the number of