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1. What is the mass of 3.0 × 1023 atoms of neon gas?
A. 0.50 gramsB. 1.0 gramsC. 5.0 gramsD. 40.0 gramsE. 10.0 grams
2. A compound has a composition of 40% sulfur and 60% oxygen by mass. What is the empirical formula of this compound?
A. SOB. S2O3C. S2O7D. SO3E. SO2
3. What is the total number of atoms represented in one molecule of (CH3)2NH?
A. 5B. 8C. 9D. 10E. 12
4. A hydrocarbon has the empirical formula CH3. A probable molecular formula for this compound could be
A. C3H3B. C2H6C. C3H8D. C4H8E. C5H10
5. The chemical symbol Ar could stand for
A. one mole of argonB. one atom of argonC. both a mole or an atom of argonD. neither a mole or an atom of argonE. one molecule of argon
6. Which salt has a solubility that is different from the other four?
A. AgClB. PbBr2C. Ca3(PO4)2D. Na2CO3E. Al(OH)3
7. A solution of a salt and 100 grams of water that can still dissolve more solute at a given temperature is classified as
A. unsaturatedB. supersaturatedC. saturatedD. diluteE. concentrated
8. The net ionic equation for the reaction between CaCl2 and Na2CO3 to form calcium carbonate and sodium chloride would include all of the following except:
A. Ca2+B. CO32–C. 2Na1+D. CaCO3E. All of the substances above would be in the net ionic equation.
9. Which solution listed below is going to have the highest boiling point?
A. 1.5 m NaClB. 1.5 m AgClC. 2.0 m C6H12O6D. 2.0 m CaCl2E. 1.0 m Al2(SO4)3
10. Which equation is correctly balanced?
A. Na + Cl2 → 2NaClB. CH4 + 3O2 → CO2 + H2OC. 2KI + Pb(NO3)2 → 2KNO3 + PbI2D. H2SO4 + KOH → K2SO4 + H2OE. C6H12O6 + 6O2 → 6CO2 + H2O
11. 110 grams of KF are dissolved in water to make 850 ml of solution. What is the molarity of the solution?
A. 0.129 MB. 0.620 MC. 0.002 MD. 0.068 ME. 2.23 M
12. Given one mole of CH4(g) as STP. Which statements are true?
I. There are 6.02 × 1023 molecules present.II. The sample will occupy 22.4 l.III. The sample will weigh 16 g.
A. I only.B. II only.C. I and III only.D. II and III only.E. I, II, and III.
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