Practice questions

Chemistry © Ray Lovegrove

Practice questions for Chemistry
Chapter:3: Atoms

R- chem3-1: How did Ancient Greeks portray atoms?

R- chem3-2: What is the name of the English chemist who came up with a theory to explain atoms?

R- chem3-3: What is the name of the theory John Dalton proposed?

R- chem3-4: What theory has been at the heart of moderm chemistry?

R- chem3-5: For how long has the atomic theory been at the heart of modern chemistry?

R- chem3-6: What type of chemistry threw new light on how elements are arranged?

R- chem3-7: What does the atomic theory postulate about atoms creation?

R- chem3-7: Does the atomic theory postulate that atoms can be created or destroyed?

R- chem3-8: What does the atomic theory postulate about atoms of the same element?

R- chem3-8.1: Does the atomic theory postulate that atoms of the same element are same or different?

R- chem3-9: What does the atomic theory postulate about atoms of different elements?

R- chem3-9.1: Does the atomic theory postulate that atoms of different elements are same or different?

R- chem3-10: How does the atomic theory postulates that atoms form molecules?

R- chem3-11: Has Dalton's atomic theory been proven wrong?

R- chem3-11.1: Has Dalton's atomic theory been discarded or retained as basically sound?

R- chem3-12: What problem do chemists face when describing atoms?

R- chem3-13: What must chemists develop to formulate ideas about atoms?

R- chem3-14: What benefits do models offer?

R- chem3-15: How did Dalton picture an atom?

R- chem3-16: Did Dalton believe atoms to be coloured?

R- chem3-17: What terminology is used to describe Dalton's representation of atoms?

R- chem3-18: What did Dalton give to each element to help him explain how atoms join together?

R- chem3-19: What was the purpose of the symbols Dalton assigned to elements?

R- chem3-20: Why is the mass of atoms difficult to conceive?

R- chem3-21: Why are grams useless when measuring an atom's mass?

R- chem3-22: What terminology is used to measure an atom's mass?

R- chem3-23: What is needed to measure atoms, as showm in the IUPAC?

R- chem3-24: What is the element which is used as a standard for measuring atoms' mass?

R- chem3-24.1: Why is carbon used as the standard for measuring atoms' mass?

R- chem3-25: How many amu are there in an atom of carbon?

R- chem3-26: What is the mass of magnesium knowing that it is twice that of carbon?

R- chem3-27: How many times the mass of an hydrogen atom goes into an atom of carbon?

R- chem3-28: For how long was Dalton's billiard ball model considered valid?

R- chem3-29: What caused Dalton's billiard ball model to be abandoned?

R- chem3-30: What are the smaller units of which an atom is composed?

R- chem3-31: What prompted the recognition of sub-atomic particles?

R- chem3-32: What happens to gases at very low pressures that are subjected to high voltage charge?

R- chem3-33: What is detected when gases at vert low pressures are subjected to high voltage?

R- chem3-34: What is the name given to negatively charged particles in an atom?

R- chem3-35: What behaviour to electrons have?

R- chem3-36: How does the voltage charge of electrons compare to their size?

R- chem3-37: What is the name given to positively charged particles in atoms?

R- chem3-38: How does the size of protons compare to the size of electrons?

R- chem3-39: What was the initial belief how protons and electrons were distributed?

R- chem3-40: What name was given to the initial model for proton and electron distribution in an atom?

R- chem3-41: How does the mass of an atom compare to the total mass of its protons and electrons?

R- chem3-42: What particle was discovered after comparing an atom mass and that of its protons and electrons?

R- chem3-42.1: What is the name given to the third particle of an atom?

R- chem3-43: How does the mass of a neutron compare to that of a proton?

R- chem3-43.1: How does the charge of a neutron compare to that of a proton?

R- chem3-44: Where are protons and neutrons found in an atom?

R- chem3-44: What is the name of the location where protons and neutrons are found in an atom?

R- chem3-45: How fast do electrons move in an atom?

R- chem3-45.1: In which area do electrons move in an atom?

R- chem3-45.2: What is name of the area in which electrons move in an atom?

R- chem3-46: How can the model of the movement of electrons in an atom be categorized?

R- chem3-47: How is the solar system applicable to the description of atoms?

R- chem3-48: How many models are necessary to describe the behaviour of particles in an atom?

R- chem3-49: What name is given to a table used to describe sub atomic particles?

R- chem3-49.1: What is the purpose of the sub-atomic particles table?

R- chem3-50: How many positive charges does a proton have?

R- chem3-51: How is the positive charge of a proton illustrated?

R- chem3-52: What is the charge of an electron?

R- chem3-52.1: How does the charge of an electron compare to that of a proton?

R- chem3-53: How is the negative charge of an electron illustrated?

R- chem3-54: What is the charge of a neutron.

R- chem3-55: What is the second model used to describe sub-atomic particles in an atom?

R- chem3-56: Is the electrons in shells model a working model?

R- chem3-57: What is the purpose of the electrons in shells model?

R- chem3-58: How do protons and neutrons appear in an electrons in shells model

R- chem3-59: What is not shown in an electrons in shells model?

R- chem3-60: How are electrons shown in an electrons in shells model?

R- chem3-61: Has the proposition that atoms of the same element are the same been proven wrong?

R- chem3-62: Do some or all carbon atoms have a mass of 12 a.m.u.?

R- chem3-63: Do all atoms of an element have the same number of protons and electrons?

R- chem3-64: Does the number of neutrons differ in the atoms of the same element?

R- chem3-65: What is the name given to atoms of the same element that have different masses?

R- chem3-66: Do all atoms have naturally occuring isotopes?

R- chem3-67: What is the unit in which elements are shown in the periodic table?

R- chem3-68: What is the figure shown for elements in the periodic table?

R- chem3-69: How is the figure shown for elements in the periodic table calculated?

R- chem3-70: Are the masses of isotopes and elements designated in the same manner?

R- chem3-71: What is the important adjective associated with the atomic mass of elements?

R- chem3-72: Are weighted mean and average the same? When are they?

R- chem3-73: How would you designate 35Cl and 37 Cl?

R- chem3-74: What does A_r stands for?

R- chem3-75: What other than the masses of isotopes is taken into consideration when calculating A_r?

R- chem3-76: What is the relative atomic mass of chlorine if there is 75% of 35Cl and 25% of 37 Cl?

R- chem3-77: Does the periodic table show that most elements have comon isotopes?

R- chem3-78: What can be said of elements that have few or rare isotopes?

R- chem3-78: What is necessary for A_r to be very close or equal to the atomic mass of an element?

R- chem3-79: Does mass make an atom of an element unique?

R- chem3-80: Is it possible for the A_r of different elements to be the same?

R- chem3-80.1: What makes the atom of an element unique?

R- chem3-80.2: Do cobalt and nickel both have the same relative atomic mass?

R- chem3-81: How are atoms arranged in the periodic table?

R- chem3-82: What is the name given to the number of protons in an atom?

R- chem3-83: To what the number of protons in an atom must always be equal to?

R- chem3-84: What is the overall charge of an atom?

R- chem3-84.1: How is the charge of electrons in an atom cancelled?

R- chem3-85: Is the number of PROTONS in an atom equal to the ATOMIC NUMBER?

R- chem3-86: Is the number of ELECTRONS in an atom is equal to the ATOMIC NUMBER?

R- chem3-87: What must be deducted from the mass number to obtain the atomic number?

R- chem3-87.1: What must be deducted from the mass number to obtain the number of neutrons?

R- chem3-87.2: What is the sum of the number of neutrons plus atomic number equal to?

R- chem3-87.3: How can the number of neutrons in an atom be calculated knowing mass and atomic numbers?

R- chem3-88: Does the number of neutrons decrease as the number of protons increase in atoms?

R- chem3-88.1: Is the number of neutrons equal to the number of protons?

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