any characteristic of a material that can be observed or measured without changing the composition of the substances in a material is a physical or chemical change?

Which will not appear in the equilibrium constant expression for the reaction below

What do bacteria elephants and plants have in common

12. Molecules of hydrogen escape from Earth, but molecules of oxygen and nitrogen are held to the surface. Why?

Which occurs more often on earth? Physical or Chemical changes?

Why do phospholipids form a bilayer in water? a. The phosphate portions repel each other b. The hydrophilic and hydrophobic parts attract each other. c. The phosphate portions attract water, and the lipid portions repel water. d.

In an experiment, a student estimates the acceleration due to gravity is 9.31 m/s2. The actual value is 9.8 m/s2. What is the student's percent error

Phosphoric acid can be used to clean scale (calcium carbonate) from water fixtures like taps by reacting with it to form products that dissolve easily. warming the phosphoric acid solution would - a. remove less scale. b. remove more scale. c.

What is the formula for tin (ll) chromate

Temperature is measured with a

Explain why an aqueous solution of Na2SO4 is neutral while an aqueous solution of Na2CO3 is basic in nature?