Let's eliminate these one by one.
The first pair would not be the same, as X would most likely be in group IA, and Y would be in group VIIA, because of their tendency to gain and lose electrons.
The second pair would also violate the same rule, but X would most likely be in group IIA, and Y would most likely be in group VIA.
The third pair would not be the same, as X is most likely in group VIIA, and since Y has eight valence electrons, it is most likely a noble gas.
The final pair has X with atomic number 15, making it phosphorous. Phosphorous wants to gain 3 electrons to have a full octet of 8 outer "valence" electrons, and Y would also like to gain 3 electrons. This means it is possible that the final pair would be in the same group.
Answer:
D. Communication of results
The number of atoms present, on average, will be the natural abundance of the isotope times the number of atoms in the sample => number of C-13 atoms = C-13 abundance * number of atoms in the sample = 1.07% * 30,000 = 1.07 * 30,000 / 100 = 321 atoms.<span> Answer: 321 atoms.</span>
Answer:
A by 0,5 cubic centimeters
Explanation:
If you use the density equation:
→
For A:
![v=\frac{9[g]}{10g/cm^3} =0,9[cm^3]](https://tex.z-dn.net/?f=v%3D%5Cfrac%7B9%5Bg%5D%7D%7B10g%2Fcm%5E3%7D%20%3D0%2C9%5Bcm%5E3%5D)
For B:
![v=\frac{4[g]}{10g/cm^3} =0,4[cm^3]](https://tex.z-dn.net/?f=v%3D%5Cfrac%7B4%5Bg%5D%7D%7B10g%2Fcm%5E3%7D%20%3D0%2C4%5Bcm%5E3%5D)
Doing the difference A-B=0,5 cubic centimeter
An exothermic reaction is a chemical reaction that releases energy through light or heat. It is the opposite of an endothermic reaction. Expressed in a chemical equation: reactants → products + energy. Exothermic Reaction means "exo" meaning releases and "thermic"
