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H2so4(aq) + mg(s)—> mgso4(aq) +h2(g) which substance is the acid in the reaction?

What is the empirical formula for c4h8o2

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.