Answer:
653.45
Explanation:
pi * 4 by the power of 2 * 13 ~653.45
Answer:
B6Br4
Explanation:
Chemical formula gives a representation of the number of atoms that each element in a compound or molecule. In this question which is asking to give the formula of hexaboron tetrabromide, the hexa means 6 while the tetra means four.
Since the number of atoms of each element is written as a prefix before the main element, this means that the chemical formula of hexaboron tetrabromide will be B6Br4.
Answer:
It has a thick atmosphere which causes extremely high temperatures.
Explanation:
Answer: 12.5 mg
Explanation:
The half-life of Iodine -123 is 13 hours.
Between 8 am on Monday and 10 am on Tuesday will be 26 hours.
After the first 13 hours, the Iodine should be left with half of its initial quantity
= 50/2
= 25 mg
There are now 13 hours remaining meaning that the Iodine will be half of the 25mg after that period.
= 25/2
= 12.5 mg.
12.5 mg remain at 10 am the next day.
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Answer: C
Explanation:
Put electron pairs about each atom such that there are 8 electrons around each atom (octet rule), with the exception of H, which is only surrounded by 2 electrons. Sometimes it's necessary to form double and triple bonds. Only C, N, O, P and S (rarely Cl) will form multiple bonds. Draw the Lewis dot structure for CF4.
