Answer:
12.5 g
Explanation:
If element R's half life is 2 minutes then we need to divide 100 g by 1/2 3 times. 100/2 = 50/2= 25/2= 12.5 g.
Hope this helps!
<span>Answer:
The two basic steps to determine whether a molecule is polar are:
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<span><span>1) determine whether the molecule contains polar bonds?
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2) determine whether the polar bonds add together to
form a net dipole moment.
Explanation:
The fundamental requirement is that there are polar bonds. Polar bonds are covalent bods with dipole moments. Dipole moments are the result of two atoms of different electronegativity sharing electrons. The more electroneative atom pulls the electrons with more strength than the other atom which is what generate the dipole moment.
If the molecule is symmetrical, and the dipole moments are place symmetrically they wil cancel each other and the molecule will not be polar. For example, the molecule of CCl4 has four C - Cl bonds each with dipole moment, but they are loacates symmetrically around the C atom, so they will cancel each other resulting in a zero net sum of dipole moments, being the molecule non-polar.
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Answer:
Every object you touch, see, taste, or smell during the day is a chemical, no matter what the signage says on some containers of “Contains no chemicals.” It would seem to me that knowing as much as possible about these objects would be of benefit to mankind, and hence chemistry becomes of great advantage to us all. The science of chemistry really has no disadvantages, but we humans can be at a disadvantage if we do not bother to learn, for example, that cyanide should not be part of your diet.
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Explanation:
a) 3 sig. figures
b) 3 sig. figures
c) 6 sig. figures
d) 2 sig. figures
e) 1.09 × 104 = 113.36 = 5 sig. figures
if it is 1.09 × 10^4, it is 10900 = 3 sig. figures
f) 4 sig. figures
Answer:
-) Lewis structure: See the figure 1
-) Oxidation number of As = +5
-) Oxidation number of O = -2
Explanation:
The first step is to calculate the <u>total amount of electrons</u>, for As we will have 5 electrons, for all the oxygens we will have 24 electrons (6 electrons for each atom) and finally we will have 3 more due to the charge (-3), so in total we will have: 5+24+3= 32 electrons.
In the lewis structure, we will have as <u>central atom</u> "As" then we have to put the oxygens around the central atom. In this case, As is an <u>exception of the octet rule</u>, in this structure As would have 10 electrons and 8 electrons for each oxygen. So, in the total distribution of the electrons in the structure, we will have the 32 electrons that we calculate in the first step (figure 1).
Finally, in the oxidation number calculation, we have to start with the oxidation number of oxygen. <u>The oxidation number of O is -2</u> then when we <u>multiply by the number of atoms</u> we will get -8, so the As must have an oxidation number of +5 in order to obtain a total charge of -3 (figure 2).
