Answer:
1. D) Sr
2. B) Cadmium
3. A)Ca2+
4. B) Small nonmetal atoms
5. C) Sb has a lower ionization energy and a lower electronegativity than I.
6. B) It tends to be more negative across a period.
7. B) The ionization energy increases because the ratio of the protons to electrons increases.
8. D) Ar
9. D) Cl
10. A) Energy needed to add an electron to a neutral atom in the gas phase.
Explanation:
I usually explain things but there are too many things to go over so let me know if u need a further explanation!
Answer:The structures of 3-brominated products are available in attachment. Kindly find in attachment.
Explanation:
1-ethyl-4-methylbenzene undergoes a radical substitution reaction when it is treated with NBS(N-bromosuccinimide).
There are 3 products which are produced in the reaction.
There are 2 positions available where bromination can occur one at 1 position and other at 4 position.
There is a ethyl group present at 1-position and a methyl group is present at 4-position.
At the 1-position where ethyl group is present 1-phenylethyl radical is generated on irradiation with UV-light. Now since this 1-phenylethyl radical is planar and a chiral centre as all groups attached to the carbon center is different hence two products of bromination can occur from this position. One from below the plane and other from above the plane. These 2 products can form with equal probability.
In one product the Bromine radical can combine with 1-phenylethyl radical form above the plane and in other product bromine radical can combine with 1-phenyl radical form below the plane.
Hence 1-phenylethyl radical would lead to products which would be 2 stereiosomers and would be known as enantiomers (mirror images).
Radical generated at 4 position that is at methyl position would be a benzyl radical and this would also be planar but since it is not a chiral center hence both the sides would be equivalent so only one product would be generated.
Kindly find in attachment for the structures of the products and reactants.
Scientists use a mortar and pestle, either manual or machine powered, to decrease the size of the particulate being examined.
For example, I recently attended a lecture about an analytical chemist’s pursuance of an alternative to dusting powder for crime labs. In his presentation, he detailed that the initial substance he considered using wasn’t working because the particles were too big and weren’t mobile-his use of an automatic mortar and pestle allowed him to reduce the size of the particulate by nearly twenty times, allowing for the use of this particulate as dusting powder.
Most likely the second one (sand letting water run through it) because if you are trying to determine how what moves through soil You would want the one the one that can do that:)