Questions | Answer | Explanations |
41 A rigid cylinder with a movable piston contains a 2.0-liter sample of neon gas at STP. What is the volume of this sample when its temperature is increased to 30.°C while its pressure is decreased to 90. kilopascals?
(1) 2.5 L (3) 1.6 L
(2) 2.0 L (4) 0.22 L | 1 | PV/T=PV/T 90(2)/303 =101.3(V)/273 P decreases and temp increases volume should increase |
42 Which compound is a saturated hydrocarbon?
(1) CH2CH2 (3) CH3CHO
(2) CH3CH3 (4) CH3CH2OH | 2 | hydrocarbon C and H only saturated, alkanes, all single bonds CnH2n+2 |
43 A molecule of a compound contains a total of 10 hydrogen atoms and has the general formula CnH2n+2. Which prefix is used in the name of this compound?
(1) but- (3) oct-
(2) dec- (4) pent- | 1 | 4 carbons Table P |
44 Reduction occurs at the cathode in
(1) electrolytic cells, only
(2) voltaic cells, only
(3) both electrolytic cells and voltaic cells
(4) neither electrolytic cells nor voltaic cells | 3 | both, never changes Red Cat An OX |
45 What are the products of a reaction between KOH(aq) and HCl(aq)?
(1) H2 and KClO (3) KH and HClO
(2) H2O and KCl (4) KOH and HCl | 2 | neutralization water and salt |
46 Which volume of 0.10 M NaOH(aq) exactly neutralizes 15.0 milliliters of 0.20 M HNO3(aq)?
(1) 1.5 mL (3) 3.0 mL
(2) 7.5 mL (4) 30. mL | 4 | MV=MV 0.20(15.0)=0.10(V) |
47 Which indicator, when added to a solution, changes color from yellow to blue as the pH of the solution is changed from 5.5 to 8.0?
(1) bromcresol green (3) litmus
(2) bromthymol blue (4) methyl orange | 2 | Table |
 | 4 | each pH unit is 10 times the previous acids (H+) low pH is more acidic increases by 10 |
 | 4 | 36.0s/7.2= 5 half lives 1/2 1/4 1/8 1/16 1/32 |
50 Which radioactive isotope is used in treating cancer?
(1) carbon-14 (3) lead-206
(2) cobalt-60 (4) uranium-238 | 2 | just has to be memorized |