What can't be changed chemically

Petroleum and coal can be mined from the continental shelf. t/f

When 1 mol of a fuel burns at constant pressure, it exchanges-3452 kJ of heat and does-11 kJ of workon the surroundings. What are ΔUand ΔH for the combustion of thisfuel?

Cindy runs 2 kilometers every morning. She takes 2 minutes for the first 250 meters 4 minutes for the next 1000 meters 1 minute for the next 350 meters and 3 minutes for the rest. Cindy's average speed for the entire run is meters per minute

A galvanic (voltaic) cell consists of an electrode composed of nickel in a 1.0 M nickel (II) ion solution and another electrode composed of copper in a 1.0 M copper (I) ion solution, connected by a salt bridge.

Calculate the molarity of a 10.0% (by mass) aqueous solution of hydrochloric acid. The density of this solution is 1.01 g/mL. a. 0.277 M b. 2.77 M c. 3.04 M d. 4.33 M e. The density of the solution is needed to solve the problem

For the baeyer-villiger oxidation of cyclohexyl methyl ketone

What will happen if the density of an object is less than the density of water?

Which cannot be separated into simpler substances? compound element solution mixture

What jobs involve chesmistry

Think about a neutral magnesium atom. Then think of a magnesium ion with a 2+charge. How are these two alike? How are they different? Be sure to use the terms proton, neutron, and electron in your answer.