Is testing for fingerprints on a door a physical or chemical change

Which is a characteristic of aromatic hydrocarbons? A. They have triple bonds B. They are cyclic C. They are saturated D. They are in straight lines.

What volume of 10.0 M H2SO4 is required to prepare 4.0 L of 0.50 M H2SO4

A mechanic needs a radiator to have 50% antifreeze solution. the radiator currently is filled with 4 gallons of 15% antifreeze solution. how much antifreeze mixture should be drained from the car if the mechanic replaces it with pure antifreeze.

5 H2O a element or compound

Complete the following reaction by drawing the missing reactant ("Structure A"). (Draw only one neutral organic compound in the empty box. "Ph" is an abbreviation for a benzene ring. Draw the benzene ring out in your answer.)

Why is it necessary for the measuring devices to be clean

Copper consists of two naturally occuring isotopes. their masses are 62.930 amu and 64.928 amu. calculate their abundances.

Which statement is true about inorganic compounds? A. They are not made of atoms. B. They contain carbon. C. They are not made from living things. D. They are all elements.

Which domain do you find the most interesting why

Complete the matching exercise below by choosing the correct description of each bond type in aqueous solution. 1. covalent bond 2. hydrogen bond 3. electrons shared by atoms a. electrons shared by atoms b.