Ionic bonds are formed between a metal and a nonmetal. Among the pairs given, K and Br satisfy these conditions and will form an ionic bond.
The question is asking about ionic bonds, which are formed when one atom donates an electron to another atom. This occurs between a metal and a nonmetal due to their differences in electronegativity.
Looking at the options, N and O are both nonmetals, C and Cl are also both nonmetals, and Fe and Ni are both metals, so they would not form ionic bonds. On the other hand, K (a metal) and Br (a nonmetal) have a difference in electronegativity such that K can donate an electron to Br, forming an ionic bond. Therefore, the pair that would form an ionic bond is K and Br.
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H2O (s)
CO2 (g)
H2O (l)
Given:
8.32 J of heat
from 23.2 degrees C to 30.5 degrees C
heat capacity of aluminum is 0.90 J/g-K
Required:
m in grams
Solution:
H = mCpT
(8.32 J) = m(0.90 J/g-K)(30.5 – 23.2)K
m = 1.27g
Synthetic fabrics are textiles man – made rather than natural fibers. Examples are acrylic, nylon, rayon, acetate, spandex, lastex and Kevlar. It is made by joining the monomers into polymers by the process known as polymerization.
H20
CaCl2
NH3
Answer: the answer would be CaCI2
Explanation: this was one of my exam questions i got right. :)