When aqueous solutions of na2so4 and pb(no3)2 are mixed, pbso4 precipitates. Calculate the mass of pbso4 formed when 1. 25 l of 0. 0500 m pb(no3)2 and 2. 00 l of 0. 0250 m na2so4 are mixed.

Which of the following ideas did greek philosopher democritus contribute to the atomic theory? a. each object is made up of one atom, which varies in size from very small to very large. b. matter is composed of only one kind of particle, which can be easily destroyed. c. every element has a specific type of atom, which remains the same size in all forms of matter. d. all matter is composed of small particles, which combine to make larger objects.

Why did the following change occur? the snow that covered the ground all winter began to melt tempatures rose and flowers started to bloom

Saul reaches out to grab a pot of boiling water and something in his body sends a sensation to his brain to warn him of the heat coming from the handle. what organ is responsible for protecting saul from the heat?