Unit 1 and 2 Exam Review Grade 11 University Chemistry

Multiple Choice 1.Which of the following statements represents a quantitative observation? a) The reactant was orange in colour. b) The product was very dense. c) The orange colour disappeared quickly. d) The temperature in the test tube reached 250 o C.

Multiple Choice 2.“The atom is mostly empty space. It consists of a very dense positive nucleus surrounded by electrons.” This description BEST fits the atomic theory proposed by a) Dalton. b) Thomson. c) Rutherford. d) Chadwick.

Multiple Choice 3.Isotopes of an element have different numbers of a) protons. b) neutrons. c) electrons. d) protons, neutrons and electrons.

Multiple Choice 4.Which of the following symbols represents an atom that contains the largest number of neutrons? a) U b) U c) Np d) Pu

Multiple Choice 5.A white solid which has a sharp melting point is decomposed by electrolysis to give a greenish gas and a silvery solid. Attempts to decompose these two substances were not successful. The silvery solid and greenish gas are a) elements from a compound. b) the components of a homogeneous mixture. c) elements from a homogeneous mixture. d) the components of a heterogeneous mixture.

Multiple Choice 6.Which of the following statements about oxygen describes its physical properties? I) Oxygen has a density of 1.43 g/mL at STP. II) Oxygen supports the burning of magnesium. III) The melting point of oxygen is –218 o C. IV) Carbon combines with oxygen to form carbon dioxide gas. V) Oxygen reacts with iron to form rust. a) I only b) I and III c) I, II and III d) II, IV and V

Multiple Choice 7.An atom of the element “X” has the orbital configuration 2, 5. Which of the following would represent the most commonly formed ion of “X”? a) X 5+ b) X 5- c) X 3+ d) X 3-

Multiple Choice 8.In which of the following sets do all the atoms and ions have the same number of electrons? a) F-, Ne, Na+ b) F-, Cl-, Br- c) He, Ne, Ar d) Li+, Na+, K+

Multiple Choice 9.The least reactive of the following elements is a) potassium. b) carbon. c) argon. d) iron.

Multiple Choice 10.Which of the following electron configurations represents the most reactive nonmetal? a) 2, 8, 1 b) 2, 8, 3 c) 2, 8, 7 d) 2, 8, 8

Multiple Choice 11.Which element has the lowest first ionization energy? a) fluorine b) neon c) sodium d) magnesium

Multiple Choice 12.A covalent bond would be most likely to form between atoms of chlorine and a) potassium. b) phosphorus. c) magnesium. d) iron.

Multiple Choice 13.The compound in the following list which is the best example of an ionic solid is: a) calcium bromide (CaBr 2 ) b) boron (III) fluoride (BF 3 ) c) carbon tetrachloride (CCl 4 ) d) silicon (IV) hydride (SiH 4 )

Multiple Choice 14.In the H-Cl bond, the two bonding electrons are located a) closer to the hydrogen than the chlorine atom. b) closer to the chlorine atom than to the hydrogen atom. c) at the same distance from both the hydrogen and the chlorine atoms. d) at opposite ends of the bonds.

Multiple Choice 15.The bond in N 2 can be best described as: a) an ionic bond b) a polar bond c) a double bond d) a triple bond

Multiple Choice 16.An unknown crystalline white solid was dissolved in water. The solution was tested with a conductivity apparatus and the light bulb glowed brightly. The identity of the solid is most likely: a) potassium bromide b) sodium metal c) carbon disulphide d) sulphur (VI) oxide

Multiple Choice 17.The correct formula for hypochlorous acid is: a) HCl (aq) b) HClO 3 (aq) c) HClO 2 (aq) d) HClO (aq)

Multiple Choice 18.Which element has the highest ionization energy? a) fluorine b) neon c) sodium d) magnesium

Multiple Choice 19)The chemical formula for iron (III) chlorite is: a)FeCl 3 b)Fe(ClO 4 ) 3 c)Fe(ClO 3 ) 2 d)Fe(ClO 2 ) 3

Multiple Choice 20) Which one of the following groups of elements will all produce acidic solutions when their oxides are added to water? a)N,Mg,K Ni b)Cl,S,Br,N c)Cr,Hg,I,S d)S,N,C,Ca

Multiple Choice 21) The set of coefficients that balances the skeleton equation is: Fe (s) + H 2 O (l)  Fe 3 O 4 (aq) + H 2 (g) a)1, 4, 1, 5 b)1, 4, 3, 4 c)3, 4, 1, 4 d)1, 2, 3, 4