Help with Chemistry problems?

[TheCarrot]

Does the "decays by beta minus emission" affect it?: You are performing an experiment that uses 113Ag. 113Ag is radioactive, decays by beta minus emission ( ?), and has a half-life of 5.3 hours. It requires 31.8 hours to ship the material from the warehouse to your laboratory. How many grams should you order if the experiment requires that you have 40 grams to begin the experiment.

a. 240 g
b. 6.67 g
c. .625 g
d. 2.56 x 103g

Can't get this one:An automobile has a wavelength that is not measurable by human standards. If the car has a mass of 4000 lbs (1.81 x 103 kg) and travels at 60 miles/hr (26.8 m/s), calculate the wavelength of the car.

a. 9.82 x 10-36 m
b. 2.76 x 10-39 m
c. 7.30 x 1037 m
d. 1.37 x 10-38 m

A or D?:Write the electronic configuration according to the general rules given in the objective for Gd (#64).

a. [Xe]6s24f75d1
b. [Xe]4f75d16s2
c. [Rn]6s24f8
d. [Xe]6s24f8

Cont..
(Cont.)
Does the last bit have 7 or 6 arrows?
Draw orbital diagrams (arrow boxes) for each orbital beyond the last noble gas for Ir (#77).

And lastly..
21. How many unpaired electrons are there for Cr (#24)?

a. 6
b. 4
c. 2
d. 1

[sunshinegirl]

1. It takes 31.8 hours to ship, that means the Ag quantity will decrease by half 31.8/5.3 = 6 times. So if you need 40 grams, you have to order 40 * 2*2*2*2*2*2 = 2560 g (D)

2. Wavelength (lambda) = Planck's Constant (h)/[Mass (kg) x Speed (m/s)]

3. B (7)

4. 1s2 2s2p6 3s2p6d5 4s1