Magnifying parts of microscope​

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

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.