Identify the isoelectronic elements. a. Cl-, F-, Br-, I-, At-
b. Ne, Ar, Kr, Xe, He
c. N3-, S2-, Br-, Cs+, Sr2+
d. N3-, O2-, F-, Na+, Mg2+
e. Li+, Na+, K+, Rb+,Cs+

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

George is a dalmatian puppy. describe what happens to light that allows you to see george’s black and white coat.

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?