Do everything has the same amount of energy

Anouk does 150 J of work using a hammer to pull a nail out of a piece of wood, and the hammer does 105 J of work on the nail. What is the efficiency of the hammer?

Which example is a constructive process?

Which element has 5 outer electrons in its 3rd shell?

If 30. g of H, SO reacts, what mass of water is produced H2SO4 + 2 NaOH = Na2SO4 + 2 H20 A. 3.0 g B. 6.0 g C. 11 g D. 16 g

The brain is composed of many cells and different tissue at what level of organizationcis the brain?

A very small equilibrium constant means ... a. an equal amount of reactants and products c. more products b. more reactants d. system isn't at equilibrium

What is in a banana? give me specifics?!

When 17.28 mL of a 0.078 M aqueous solution of Na2SO4 is combined with 11.30 mL of a 0.20 M aqueous solution of NaCl and 7.84 mL of a 0.26 M aqueous solution of KCl, what is the total concentration of Na + in the combined solution?

What mass of carbon can 3000 J of energy raise from 12°C to 40°C?

How do you balance __Mg + __HCl - - > __MgCl2 + ___ H2