Give an example of a purely physical change and an example of a chemical change

The sign of ΔHrxn and ΔSrxn for several different reactions are given. In which case is the reaction spontaneous at all temperatures? ΔHrxn0ΔHrxn<0; ΔSrxn0; ΔSrxn0; ΔSrxn>0

Which two biomes are known as the dry biomes?

What type of energy does a stone have when it hits the ground? Electrical energy Kinetic energy Potential energy Radiant energy

Mechanical (sound) waves are unable to travel through a vacuum, such as through space, but radio waves are transmitted to Earth from satellites. How is this possible? A) Radio waves are electromagnetic waves.

If you need to extract a 50 ml aqueous solution with 50 ml of dichloromethane, what is the minimum size of a separatory funnel you will have to use to safely carry out this procedure? briefly explain your answer.

All of the following can be recycled except clothing aluminum cans compact fluorescent bulbs plastic drink bottles

Use Henry's law and the solubilities given below to calculate the total volume of nitrogen and oxygen gas that should bubble out of 1.0 L of water upon warming from 25 ∘C to 50 ∘C.

Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, which means that a certain number of water molecules are included in the solid structure.

When you light a fire place what energy transformation takes place

Correctly identify the generic formula for a synthesis reaction. a. AB + A+B b. A+B → AB c. CxHx + O2 → CO2 + H2O d. AB + C + AC + B e. AB + CD → AD + CB