Bombarding sodium-23 with a
proton produces nuclide X and a neutron. What is nuclide X?
Answers:
magnesium-24
magnesium-23
neon-23
s
odium-24
none of the above
The isotope P
has a half-life of 14.3 days. If a sample originally contained 1.00 g of P,
how much was left after 43 days?
Answers:
0.250 g
0.125 g
0.750 g
0.500 g
Identify X in the reaction
below.
U
+ C
→ Cf
+ X
Answers:
1
alpha particle
3
protons
6
neutrons
6
electrons
A .20 gram sample of C-14 was allowed to decay for 3 half-lives. What mass
of the sample will remain? Carbon-14 has a half life of 5730
years.
Answers:
0.025
0.05
0.1
0
.01
0.05
The isotope Cu
has a half-life of 30 s. If a sample originally contained 48 mg of Cu,
how much time passed before the amount fell to 3 mg?
Answers:
120 s
240s
30 s
60 s(when I did my calculation for the question above, I got 60 seconds)
What radionuclide decays to Fe-56
by beta emission?
Answers:
Fe
Co
Mn
Co
MnHow do I know wat it becomes. I put 57 Co 27 and it's wrong.
The Cf
to Cf
conversion is accompanied by __________.
Answers:
an alpha
emission
a
neutron capture
an electron
capture
an electron releaseI would greatly appreciate your help...ASAP. Thank you.
b. buffer
c. acid
d. catalyst
Answer:
Explanation:
Given parameters:
Mass of ionic compound = 0.3257g
Mass of AgBr precipitate = 0.7165g
Unknown:
Percent mass of Br in the original compound.
Solution
The percent mass of Br in original compound =
Now we have to find the mass of Br⁻:
We must note that the same mass of Br⁻ would move through the ionic sample to form the precipitate.
Mass of Br in AgBr =
Mass of Br = x 0.7165
Mass of Br = 0.426 x 0.7165 = 0.305g
Percent mass of Br = x 100 = 93.7%