There are several ways to model a compound. One type of model is shown. What is the chemical formula for the molecule represented by the model?

CHO

C4H9O2

C4H8O

C3H8O2

The vapour pressure of benzene is 53.3 kpa at 60.6 °c, but it fell to 51.5 kpa when 19.0 g of a non-volatile organic compound was dissolved in 500 g of benzene. calculate the molar mass of the compound.

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system

What you see with your eyes is a form of energy. a. light b. heat c. chemical d. electrical