Select all that apply. Which of the following are examples of chemical changes? change in composition a substance decomposing burning melting

18. use the activity series to predict whether the following synthesis reaction will occur. write the chemical equations for the reaction if it's predicted to occur. (s) + o2(g) -> *note: it is possible.*

Compare and contrast refraction of light and sound will give brainliest

What substance has a mass of 9.5g and volume of 2.1cm^3