How many moles of calcium carbonate are in 63.8 g of calcium carbonate?

What is the independent variable in this investigation? mass volume sample number substance density

How does the viscosity of magma change as magma cools?

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.