Chemistry Multiple Choice Questions

Topics: Gas, Thermodynamics, Oxygen Pages: 6 (1092 words) Published: July 9, 2011
Chemistry 1 - Foundation
Instruction:Answer all the questions in OMR paper provided.

1. The following species: 2412Mg2+, 2713Al3+, 2010Ne, 199F-, all have the same number of A. Protons
B. Electrons
C. Neutrons
D. Nucleons

2. A compound contains 24% magnesium, 28% silicon, and 48% oxygen by mass. What is the empirical formula? A.MgSiO

3. Which equation represents the first ionization energy of fluorine? A. F (g) + e- →F- (g)
B. F- (g) → F (g) + e-
C. F+ (g) → F (g) + e-
D. F (g) → F+ (g) + e-
4. What is the electron arrangement of an Al3+ ion?
A. 1s2 2s2 2p6
B. 1s2 2s2 2p1
C. 1s2 2s2 2p6 3s2 3p1
D. 1s2 2s2 2p6 3s2 3p6

5. The relative masses and charges of protons, neutrons and electrons are: Relative massRelative charge
Neutron1 0
Electron negligible-1
Using these data, what are the values for the mass and charges of the helium nucleus? Relative massRelative charge
A. 2+2
B. 2 0
C. 4+2
D. 40

6. Which of the following molecules is non-polar?
A. CHCl3
B. SF6
C. NH3
D. H2O
7. Which combination of elements will form an ionic bond? A. Boron-chlorine
B. Carbon-fluorine
C. Lithium-oxygen
D. Phosphorus-oxygen

8. Choose the molecule(s) which has (have) hydrogen bonding I. CH3COOH
A. I only
B. I and II only
C. II and III only
D. I, II and III.

9. Choose the correct statement(s) about CO2.
I. There are 2 π bonds in one CO2 molecule.
II. The molecule is linear.
III. There are 2 σ bonds in one CO2 molecule.
A. I only
B. I and II only
C. II and III only
D. I, II and III.

10. Phosphorus (v) bromide, PBr5 is a yellow solid. Which of the following statements about PBr5 is correct? A. It is an ionic compound.
B. It has a trigonal bipyramidal structure.
C. The bond angle of the Br-P-Br bond is approximately 120°. D. The phosphorus atom is surrounded by eight electrons.

11. As the temperature of a reaction between two gases is increased, the rate of the reaction increases. This is mainly because A. the concentrations of the reactants increase.
B. the molecules collide more frequently.
C. the pressure exerted by the molecules increases.
D. the fraction of molecules with the energy needed to react increases.

12. The following reaction coordinate diagram represents.
A. An endothermic reaction
B. An exothermic reaction
C. a reaction that is neither endothermic nor exothermic D. a reaction in which a catalyst is used

13. The rate of a reaction between two gases increases when the temperature is increased and a catalyst is added. Which statements are both correct for the effect of these changes on the reaction? | |Increasing the temperature |Adding a catalyst | |A |Collision frequency increase |Activation energy increases | |B |Activation energy increases |Activation energy does not change | |C |Activation energy does not change |Activation energy decreases | |D |Activation energy increases |Collision frequency increases |

14. Consider the following reaction mechanism:

The catalyst is
A. O2
B. O3...
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