- Description
- Full Document
West Coast University – CHEM 280 Week 2 Quiz
1. What is the formula of the ionic compound formed when ions of calcium and nitrogen combine?
A) CaN
B) CaN2
C) Ca2N
D) Ca3N2
E) Ca2N3
2. Which combination of atoms is most likely to form an ionic compound if they are allowed to react with each other?
A) metal and metal
B) metal and nonmetal
C) nonmetal and nonmetal
D) metalloid and metalloid
E) All combinations are likely to form an ionic compound.
3. What is the name of Fe2+ in the Stock system?
A) iron 2 ion
B) iron (II) ion
C) ferric (II) ion
D) ferrous 2+ ion
E) iron cation
4. A molecule of deoxyribose, an essential part of DNA, contains five carbon atoms, ten hydrogen atoms, and four oxygen atoms. How would the formula of deoxyribose be represented?
A) 5C10H4O
B) C5H10O4
C) C5H10O4
D) C5H 10O 4
E) All formulas are acceptable.
5. Which of the following compounds contains a polyatomic ion?
A) NaOH
B) HCl
C) Ca3N2
D) MgBr2
E) NH3
6. What is the name of the ion NH4 + ?
A) nitrogen tetrahydrate
B) nitrogen hydrate
C) mononitrogen tetrahydrogen
D) ninhydrin
E) ammonium
7. What is the name of the ionic compound with the formula Na3PO4?
A) silver phosphite
B) sodium phosphorus oxide
C) trisilver tetraphosphate
D) trisodium tetraphosphate
E) sodium phosphate
8. Emergency treatment of cardiac arrest victims sometimes involves injection of a calcium chloride (CaCl2) solution directly into the heart muscle. Which statement about the compound CaCl2 is FALSE?
A) This compound is an ionic compound.
B) The cation in this compound is Ca2+ .
C) The anion in this compound is Cl2 − .
D) There are two chloride ions in this compound.
E) The net charge on this compound is zero.
9. What is the formula of the compound sulfur trioxide?
A) S3O
B) SO3
C) S(O2)3
D) S3O2
E) S3O 2−
10. Which formula represents ammonia?
A) Al3
B) AlH3
C) NH4 +
D) NH3
E) AN4
11. Baking soda consists of the ionic compound sodium bicarbonate. What is the formula of this compound?
A) Na(CO3)2
B) Na2CO3
C) NaBiCO3
D) NaHCO3
E) Na2HCO3
12. The drug “lithium” is often prescribed to treat mental illness. It is not the element lithium, but the ionic compound Li2CO3, that is actually administered. What is the name of this compound?
A) dilithium carbon trioxide
B) lithium carbide
C) lithium carboxide
D) lithium carbonate
E) lithium tricarbonate
13. Vehicle airbags inflate when the ionic compound sodium azide rapidly decomposes to the elements sodium and nitrogen. If the azide ion is a polyatomic ion with the formula N3 − , what is the formula of sodium azide?
A) NaN3
B) Na3N3
C) Na3(N3)3
D) Na3N
E) Na(N3)3
14. The ionic compound iron(II) sulfate is used in iron-containing supplements. What does the (II) in the name of this compound specifically indicate?
A) there are two iron ions in this compound
B) the charge on the iron ion is +2
C) the charge on the sulfate ion is −2
D) iron has two valence electrons
E) there are two sulfate ions in this compound
15. What statement about the ammonia molecule, NH3, is FALSE?
A) The molecule contains three polar bonds.
B) The molecule itself is not polar.
C) The molecule has a trigonal pyramidal shape.
D) The nitrogen atom has one nonbonding pair of electrons.
E) The pull of the electrons in the N−H bonds is toward the nitrogen atom.
16. Predict the formula of the compound formed when ions of sodium and sulfur combine.
A) Na2S
B) NaS2
C) NaS
D) Na2S2
E) Na3S
17. What is the formula of the sulfate ion?
A) SO4 –
B) SO3 –
C) SO4 2–
D) SO3 2–
E) SO2 2–
18. What is the name of the ion whose formula is NO3 – ?
A) nitrogen trioxide ion
B) nitrate ion
C) ammonium ion
D) sodium oxide ion
E) nitride ion
19. What is the name of CuF2 in the Stock system?
A) copper(I) fluoride
B) copper(II) fluorate
C) copper difluoride
D) copper fluoride
E) copper(II) fluoride
20. What is the formula of the ionic compound sodium carbonate?
A) NaCO2
B) Na2CO2
C) Na2CO3
D) Na(CO3)2
E) Na3CO3
21. What is the name of the compound whose formula is CCl4?
A) carbon tetrachloride
B) carbon(IV) chloride
C) carbon chloride
D) carbotetrachloride
E) carbonate tetrachloride
22. The ionic compound magnesium hydroxide can be found in antacid tablets. What is the formula of magnesium hydroxide?
A) Mg2OH
B) MgOH2
C) MgO2H2
D) Mg(OH)2
E) MgOH
23. What is the correct formula of diphosphorus pentoxide?
A) P5O2
B) PO2
C) P2O4
D) P2O5
E) P5O
24. What is the proper name for N2O5?
A) nitrogen(IV) oxide
B) dinitrogen pentoxide
C) nitrogen oxide
D) nitrate
E) nitrite
25. What is the proper name for Mg(CN)2?
A) manganese carbon nitride
B) manganese dicyanide
C) magnesium dicarbon dinitride
D) magnesium(II) dicyanide
E) magnesium cyanide
26. What are the three primary particles found in an atom?
A) neutron, positron, and electron
B) electron, neutron, and proton
C) electron, proton, and nucleon
D) positron, electron, and nucleon
E) proton, electron, and neutrino
27. What is the value of the mass number in the isotope 131 53 I ?
A) 53
B) 78
C) 126.9
D) 131
E) 184
28. What term is used to describe atoms of the same element that have different masses?
A) radioactive
B) constituents
C) isotopes
D) telomers
E) isomers
29. Which statement explains why isotopes have different mass numbers?
A) Isotopes differ in the number of protons each contains.
B) Isotopes differ in the number of electrons each contains.
C) Isotopes differ in the number of neutrons each contains.
D) Isotopes differ in the number of protons and neutrons each contains.
E) Isotopes differ in the number of protons and electrons each contains.:
30. When a neutral atom gains one or more electrons, what type of particle is formed?
A) an anion
B) an isotope
C) a proton
D) a positron
E) a cation
31. What is always true for a neutral atom?
A) there is an equal number of protons and neutrons
B) there is an equal number of protons and electrons
C) there is an equal number of protons, neutrons, and electrons
D) the number of protons and neutrons is an even number
E) the number of protons, neutrons, and electrons is an even number
32. What was J. J. Thomson’s important discovery about cathode rays in 1897?
A) Cathode rays were indestructible.
B) Cathode rays were heavier than anode rays.
C) Cathode rays consisted of a stream of electrons.
D) Cathode rays were produced by all radioactive atoms.
E) Cathode rays were able to initiate radioactive decay of an atom.
33. What is Rutherford’s important contribution to our knowledge of atomic structure?
A) Atoms contain a small, dense, positively charged nucleus, surrounded largely by empty space.
B) The atom cannot be created, divided, destroyed, or converted to any other type of atom.
C) Electrons in an atom have the magnetic property of spin.
D) Electrons are confined to certain specific regions of space outside the nucleus.
E) Electrons follow circular paths around the nucleus of an atom.
34. Which statement concerning atoms is FALSE?
A) The atomic number of an atom is the number of protons it contains.
B) The mass number of an atom is the sum of the number of protons, neutrons, and electrons it contains.
C) The nucleus of an atom contains its protons and neutrons, and is positively charged.
D) The nucleus of an atom is the heaviest part of the atom.
E) Electrons reside outside the nucleus in what is called the electron cloud.
35. The identity of an atom is determined by which of the following?
A) the number of electrons it contains
B) its mass number
C) the number of isotopes it has
D) the number of protons it contains
E) the number of protons and neutrons it contains
36. Who stated that the elements, when arranged according to their atomic masses, showed a distinct periodicity of their properties?
A) Dmitri Mendeleev
B) Niels Bohr
C) J.J Thomson
D) Ernest Rutherford
E) John Dalton
37. Which statement about the modern periodic table is FALSE?
A) Elements are arranged in order of increasing atomic number.
B) A period is a horizontal row of elements.
C) A group is a vertical column of elements.
D) A stepwise line separates the metals from the nonmetals; metals are to the left of the line, nonmetals are to the right of the line.
E) Elements in the same period share similar chemical and physical properties.
38. The modern periodic law states that the physical and chemical properties of the elements are periodic functions of what property?
A) electrons
B) atomic weight
C) neutrons
D) atomic number
E) mass number
39. The ion K+ is formed by which process?
A) loss of an electron by K
B) gain of proton by K
C) loss of a proton by K
D) gain of an electron by K
E) none of the above
40. Tungsten is a metal containing 74 protons, and is used widely in the electronics industry. What is the chemical symbol for tungsten?
A) T
B) Tg
C) Tn
D) W
E) As
41. Which period contains the element sodium?
A) one
B) two
C) three
D) five
E) eleven
42. What are the columns of elements on the periodic table called?
A) groups
B) shells
C) periods
D) metals
E) rows
43. What is the general name given to the elements of Group IA (1)?
A) halogens
B) alkali metals
C) alkaline earth metals
D) noble gases
E) metalloids
44. What term is used for the elements straddling the “staircase” boundary between the metals and nonmetals?
A) transition elements
B) metalloids
C) cations
D) lanthanides
E) noble gases
45. Which element is a halogen in period 4?
A) bromine
B) silicon
C) iodine
D) krypton
E) potassium
46. Hydrogen can form two different ions: a hydrogen ion (H+ ), and a hydride ion (H− ). Which statement concerning these ions is FALSE?
A) The H+ ion is a cation formed by the loss of one electron; this ion has no valence electrons.
B) The H− ion is an anion formed by the gain of one electron; this ion has a full n=1 energy level.
C) The hydrogen ion and the hydride ion are isotopes.
D) The hydrogen ion and the hydride ion have the same number of protons.
E) The hydrogen ion and the hydride ion have different sizes.
Preview
