Halp !   1) which of these is a chemical property of a substance? 1-reactivity 2-color 3-boiling point 4-melting point 2) which of these is true of a chemical reaction? 1-energy is always transferred from reactants to products. 2-energy is always transferred from reactants to reactants 3-energy is transferred between products and reactants. 4-energy is not transfered. 3) which of these is an example of physical change? 1-melting a substance 2-breaking chemical bonds 3-forming chemical bonds 4-nuclear decay 4) which of these is an example of a chemical change? 1-cutting bread 2-spreading peanut butter 3-digesting a sandwich 4-stirring jelly 5) which of these is an example of a physical change? 1-gasoline burning 2-metal denting 3-iron rusting 4-silver tarnishing