Which of the following characterizes the nucleus of every atom? 1. It has a positive charge

2. It is very dense

3. It is composed of protons, neutrons and electrons

a
I and II only
b
I, II and III
c
I and III only
d
II and III only

Which is a characteristic of mixtures?

Which statement is true about the part of the electromagnetic spectrum that human eyes can detect? it contains only the colors of the rainbow and television waves. o it is divided into seven ranges of wavelengths. it contains ultraviolet, visible, and infrared light. it is divided into nine ranges of wavelengths.

Phosphorous acid, h3po3(aq) , is a diprotic oxyacid that is an important compound in industry and agriculture. the values of phosphorous acid are 1.30 6.70 calculate the ph for each of the given points in the titration of 50.0 ml of 1.5 m h3po3(aq) with 1.5 m koh(aq) .