Name: 1) An example of a binary compound is A) potassium chlorate B) potassium chloride C) ammonium chloride D) ammonium chlorate 2) What is the chemical formula for nitrogen (I) oxide? NO 3) What is the formula for nitrogen (IV) oxide? A) NO B) 4) An atom represented by X forms a compound with the formula. The atom could be A) Cs B) Na C) Mg D) Al 5) What is the name of the compound whose formula is? A) nitrogen (II) oxide B) nitrogen (IV) oxide C) nitrogen (III) oxide D) nitrogen (V) oxide 6) In a sample of solid, the ratio of barium to nitrate is A) 1:2 B) 1:1 C) 1:6 D) 1:3 7) Which pair of atoms would form the most stable compound? A) Li and I B) Li and Cl C) Li and Br D) Li and F 8) The table below lists four different chemical bonds and the amount of energy released when 1 mole of each of the bonds is formed. Which of the bonds is the most stable? A) H--F B) H--Br C) H--Cl D) H--I 9) Generally, how many valence electrons are needed for atoms to be most stable? A) 18 B) 32 C) 8 D) 6 10) Which particles may be gained, lost, or shared by an atom when it forms a chemical bond? A) protons B) neutrons C) electrons D) nucleons 084f39de - Page 1 11) Electronegativity is a measure of an atom's ability to A) repel the protons of another atom B) attract the electrons in the bond between the atom and another atom C) repel the electrons in the bond between the atom and another atom D) attract the protons of another atom 12) In which compound do the atoms have the greatest difference in electronegativity? KF C) LiI D) NaBr 13) Which atom has the strongest attraction for electrons? A) F B) Br C) I D) Cl
084f39de - Page 2 14) Given the electron-dot formula: Which atom represented as X would have the least attraction for the electrons that form the bond? A) I B) Br C) F D) Cl 15) Which compound has the least ionic character? A) MgS B) KI C) HCl D) NO 16) Element M has an electronegativity of less than 1.2 and reacts with bromine to form the compound. Element M could be A) Al B) Na C) K D) Ca 17) An element with an electronegativity of 0.9 bonds with an element with an electronegativity of 3.1. Which of the following phrases best describes the bond between these elements? A) mostly covalent in character and formed between a metal and a nonmetal B) mostly ionic in character and formed between two nonmetals C) mostly ionic in character and formed between a metal and a nonmetal D) mostly covalent in character and formed between two nonmetals 18) When ionic bonds are formed, metallic atoms tend to A) lose electrons and become negative B) lose electrons and become positive C) gain electrons and become positive D) gain electrons and become negative 19) Compounds with the greatest ionic character would form when fluorine reacts with A) Group 13 elements B) noble gases C) metalloids (semimetals) D) alkali metals 20) A characteristic of ionic solids is that they A) have low boiling points B) have high melting points C) are noncrystalline D) conduct electricity 21) What type of bonding is characteristic of a substance that has a high melting point and electrical conductivity only in the liquid phase? A) metallic B) coordinate covalent C) ionic D) nonpolar covalent 22) Which compound contains both ionic and covalent bonds? NaBr C) HBr D) NaOH 23) What type of bonds are formed when two non-metal atoms combine? A) covalent bonds B) metallic bonds C) ionic bonds D) network bonds 24) Which atoms are most likely to form covalent bonds? A) nonmetal atoms that share electrons B) nonmetal atoms that share protons C) metal atoms that share electrons D) metal atoms that share protons
084f39de - Page 3 25) The correct electron-dot formula for hydrogen chloride is 26) The total number of pairs of shared electrons in a nitrogen molecule is A) 1 B) 2 C) 3 D) 4 27) A substance was found to be a soft, nonconducting solid at room temperature. The substance is most likely A) a metallic solid B) an ionic solid C) a molecular solid D) a network solid 28) Which terms describe a substance that has a low melting point and poor electrical conductivity? A) covalent and metallic B) ionic and molecular C) ionic and metallic D) covalent and molecular 29) What type of bond is present in a water molecule? A) nonpolar covalent B) polar covalent C) ionic D) electrovalent 30) What type of bonding is found in the molecule HBr? A) nonpolar covalent B) ionic C) metallic D) polar covalent 31) What type of bonding is found in the molecule HF? A) polar covalent B) nonpolar covalent C) metallic D) ionic 32) The P--Cl bond in a molecule of is A) polar covalent B) electrovalent C) nonpolar covalent D) coordinate covalent 33) Given: The attraction for the bonding electrons would be greatest when X represents an atom of A) S B) O C) Te D) Se 34) Which molecule contains a polar covalent bond? 35) Which electron-dot diagram represents a molecule that has a polar covalent bond? 36) The electrons in a bond between two iodine atoms are shared A) equally, and the resulting bond is nonpolar B) unequally, and the resulting bond is polar C) unequally, and the resulting bond is nonpolar D) equally, and the resulting bond is polar
084f39de - Page 4 37) Which of the following is a nonpolar molecule containing a nonpolar covalent bond? 38) Which molecule contains a nonpolar covalent bond? B) D) A) C) 39) When two atoms form a chemical bond by sharing electrons, the resulting molecule will be A) nonpolar, only B) polar, only C) neither polar nor nonpolar D) either polar or nonpolar 40) Which molecule is polar and contains polar bonds? 41) Which formula represents a polar molecule? 42) Which two compounds contain only polar molecules? A) HCl and B) HCl and C) CO and D) and 43) Why is classified as a polar molecule? A) is a gas at STP. B) molecules have asymmetrical charge distribut. C) N--H bonds are nonpolar. D) Nitrogen and hydrogen are both nonmetals. 44) Which formula represents a tetrahedral molecule? HBr 45) Which of the following is the correct electron-dot formula for a molecule of chlorine? 46) Which molecule is nonpolar? 47) Which structural formula represents a nonpolar symmetrical molecule? 48) Which molecule is a dipole? 49) Oxygen, nitrogen, and fluorine bond with hydrogen to form molecules. These molecules are attracted to each other by A) ionic bonds B) coordinate covalent bonds C) hydrogen bonds D) electrovalent bonds
084f39de - Page 5 50) What type of attraction occurs between nonpolar covalent molecules? A) weak intermolecular forces B) hydrogen bonding C) ion-ion attraction D) molecule-ion attraction