If a system requires 150 J of input work and produces 123 J of output work, what's its efficiency? A. 72% B. 122% C. 82% D. 92%

Which electron shell contains the valence electrons of a radium atom in the ground state? 1. the sixth shell 2. the second shell 3. the seventh shell 4. the eighteenth shell

Is a marshmallow turning black when toasted a physical or chemical change?

How many multiple bonds in ch4

What happens to the concentration as more solute is added?

What mass of Na2SO4 is needed to make 2.5L of 2.0 M solution?

What are the major water reservoirs of the world?

Name four elements that have properties similar to chlorine

What are three signs that a chemical change has taken place

Youll get brainliest if you have it right! How much heat does 225 g of water gain when its temperature rises from 25%C to 32°C? A. 6.59kj B. 21.65 kj C. 0.376kj D. 30.12kj

Explain hydrocarbons as fue