A radio station broadcasts at 99.5 MHz. The wavelength of the ...

[MirandaLo]

A radio station broadcasts at 99.5 MHz. The wavelength of the signal is ________ m.
 
  A) 3.10
  B) 3.02
  C) 2.90
  D) 2.75
  E) 4.71

Question 2

When 50.0 mL of 0.400 M Ca(NO3)2 is added to 50.0 mL of 0.800 M NaF, CaF2 precipitates, as shown in the net ionic equation below. The initial temperature of both solutions is 23.0C.
 
  Assuming that the reaction goes to completion, and that the resulting solution has a mass of 100.00 g and a specific heat of 4.18 J/(g  C), calculate the final temperature of the solution. Ca2+(aq) + 2 F-(aq)  CaF2(s) H = -11.5 kJ A) 22.45C
  B) 23.55C
  C) 24.10C
  D) 24.65C

Question 3

The standard emf for the cell using the overall cell reaction below is +2.20 V: 2Al (s) + 3I2 (s)  2Al3+ (aq) + 6I- (aq) The emf generated by the cell when Al3+ = 3.5  10-3 M and I- = 0.30 M is ________ V.
 
  A) 2.20
  B) 2.28
  C) 2.12
  D) 2.36
  E) 2.23

Question 4

The molecular weight of a gas that has a density of 6.70 g/L at STP is ________ g/mol.
 
  A) 4.96  102
  B) 1.50  102
  C) 7.30  101
  D) 3.35
  E) 2.98  10-1

[cupcake16]

Answer to Question 1

B

Answer to Question 2

B

Answer to Question 3

B

Answer to Question 4

B