How could the appearance of a substance change with out it becoming a different substance

Where would electrons in the d sublevel be found?

A student wishes to prepare 65.0 mL of 0.875 M HCl from 12.0 M HCl. What volume of the 12.0 M HCl should he/she start with?

Give two examples of amphibians. describe one similarity and difference between amphibians and fish

Why do dipoles cancel out?

How does the force of gravity affect objects in the universe?

What is the price of Aluminum per pound?

How could the appearance of a substance change with out it becoming a different substance

A chemical reaction has Hf, reactants = - 1,023 kJ and Hf, products = - 935.3 kJ. Which graph can be used to represent this reaction pathway?

At a certain temperature the rate of this reaction is first order in HI with a rate constant of : 7.21/s2HI (g) = H2 (g) + I2 (g) Suppose a vessel contains HI at a concentration of 0.440M. Calculate the concentration of HI in the vessel 0.

The process of dissolving allows chemical reactions to take place more effectively in the body. Explain why this is so.