Asubstance undergoes a change. which statement indicates that the change was a physical change?
heat energy was given off.
the molecules of the substance changed.
the substance changed shape.
the substance changed color.

What is the independent variable in this investigation? mass volume sample number substance density

What type of energy do chemical bonds have? what type of energy is it converted to during chemical reactions? question 15 options: chemical bonds have kinetic energy, which is converted to potential energy during chemical reactions. chemical bonds have electric energy, which is converted to potential energy during chemical reactions. chemical bonds have heat energy, which is converted to kinetic energy during chemical reactions. chemical bonds have potential energy, which is converted to heat energy during chemical reactions.

List the path of the respiratory system