What are the dependent and independent variables? (Picture^^)

What is the chemical formula for the compound formed between sodium and flour one

What’s the physical properties in calcium chloride

Which of the following statements is true? a. most heat energy is easily recovered and used for useful actions. b. friction causes molecules to vibrate more slowly. burning air and gasoline in an c. engine changes chemical energy into mechanical energy. it is impossible to d. change mechanical energy into mechanical energy.