1) which is not a way to know if a chemical change has occurred? a. heat is absorbed or released b. phase change occurs c. new color d. new substance is made 2) is co2 a reactant or product? 3) is o2 a reactant or product? (2 and 3 are combined i just made them two separate questions)

Aforce of 34n stretches a very light ideal spring 0.73 m from equilibrium, what is the force constant (spring constant) of the spring? (a) 47n/m (b) 38n/m (c) 53n/m (d) 25n/m

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat

What is the temperature in degrees celsius of a substance with a tempature of 49k