mrs. brown's science class is doing an experiment with sound waves. the class tested several different materials to see how quickly a sound wave would travel through each of the mediums. predict the order the materials were placed in if the class put them in order from slowest sound wave to fastest sound wave.

air, water, desk

air, desk, water

water, air desk

desk, water, air

What are the chemical names of these compounds? ke: mg3n2: reset next

Scientists have developed an explanation of a phenomenon from several verified hypotheses. the explanation has been confirmed through numerous experimental tests. which option best describes this explanation? a. scientific lawb. research questionc. hypothesisd. scientific theory

Phosphoric acid is a triprotic acid ( =6.9×10−3 , =6.2×10−8 , and =4.8×10−13 ). to find the ph of a buffer composed of h2po−4(aq) and hpo2−4(aq) , which p value should be used in the henderson–hasselbalch equation? p k a1 = 2.16 p k a2 = 7.21 p k a3 = 12.32 calculate the ph of a buffer solution obtained by dissolving 18.0 18.0 g of kh2po4(s) kh 2 po 4 ( s ) and 33.0 33.0 g of na2hpo4(s) na 2 hpo 4 ( s ) in water and then diluting to 1.00 l.