Which of the following substances can have variable composition?

a) diamonds

b) graphite

c) air

d) water

Which statement is true for a heating curve? A.) It shows how the pressure of a substance changes when heated. B.) It shows how the temperature of a substance changes when heated. C.) It shows how the volume of a substance changes when heated. D.

In medicine it is sometimes necessary to prepare solutions with a specific concentration of a given ion. A lab technician has made up 100.0 mL of a solution containing 0.50 g of NaCl and 0.30 g of KCl, as well as glucose and other sugars.

What is the concentration of iron ions (in M) in a 7.08 M solution of Fe3 (PO4) 2

A 100. mL volume of 0.800 M calcium chloride is mixed with 400. mL of water to make 500. mL of solution. What is the final molarity of this solution?

What types of isomerism are exhibited by the coordination complex [co (dppe) (net3) 2cl2]?

Which of those molecules are polar. Co2, So2, CH2Cl2, PCl3

A chemical spill gets into the soil and effects the plants within a forested ecosystem. explain why the top predators would be most affected by this

If the heat released during condensation goes only to warming the iron block, what is the final temperature (in ∘C∘C) of the iron block? (Assume a constant enthalpy of vaporization for water of 44.0 kJ/molkJ/mol.)

Which of the following is not a disaccharide? A) sucrose B) maltose C) lactose D) amylose E) all of the above are disaccarides

The process by which a semipermeable membrane allows water molecules, small molecules, and ions to pass through while retaining large particles