consider the following chemical compounds: MnO2,NaHCO3,Na2CO3 NH4CL and Pb ( NO3)2. Which of them has black color, is a basic oxide, sublime on heating, dissolves in water to give a solution of pH less than 7.

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

According to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to another? the volume and the shape stay the same. the volume increases to fill the new container, but the shape stays the same. the volume stays the same, but the shape changes to fit the new container. the volume and the shape change to fill the new container.