Answer:
Fossil record
Explanation:
but first think about it befor you do so it could be wrong im not a computer
Answer:
Since the tape has extra electrons, it has a negative charge. When you move your finger close to the tape, electrons in your skin are repelled and move away. This makes the skin on your finger tip have a slight positive charge. Since positive and negative attract, the tape moves toward your finger.
Al(OH)₃ + 3HCl = AlCl₃ + 3H₂O
C=0.200 mmol/mL
M{Al(OH)₃}=78.0 mg/mmol
m{Al(OH)₃}=55.0 mg
n{Al(OH)₃}=m{Al(OH)₃}/M{Al(OH)₃}
3n{Al(OH)₃}=n(HCl)=CV
3m{Al(OH)₃}/M{Al(OH)₃}=CV
V=3m{Al(OH)₃}/[CM{Al(OH)₃}]
V=3*55.0/[0.200*78.0]=10.6 mL
B-10 = 19.9%
B-11 = 80.1%
Abundance of B10 = x
Abundance of B11= y
You know x+y = 1 because there are only the 2 isotopes.
Y= 1-x
10.01294x + 11.00931 (1-x) = 10.811
10.01294x + 11.00931 - 11.00931x = 10.811 - 0.99016x = -0.198
X = 0.200
Check:
10.01294(0.2) + 11.00931 (0.8) = 10.81
20% B10. 80% B11
