Arrange the following ions in order of increasing ionic radius: potassium ion, chloride ion, phosphide ion, calcium ion

Enter the FORMULA for each ion in the boxes below.

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

What is the value of keq for the reaction expressed in scientific notation?