What is the pH of a NaOH solution with a concentration of 4 x 10-4 M?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

How do you lengthen a pattern piece? (family and consumer science, sewing)

What are the names of these two interactions with cattle and how do they differ from each other