Which of the following pairs of substances can be broken down chemically?
a. ammonia and iron
b. helium and argon
c. methane and water
d. potassium and lithium
e. water and carbon

Can someone me with questions 12 and 13 plz.

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state. a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car

In which phase of mitosis do the spindle fibers pull the chromosomes apart to opposite sides of the cell ?