Afood item that is left out of the refrigerator turns brown and forms bubbles and gas. what are the signs that this is a chemical reaction? check all that apply. * 2 points heat is produced bubbles appear. the color changes. heat is absorbed. a precipitate forms.

This element exists in adundance in the sun.explain how you would go about capturing sunlight.would this captured sunlight contain any of the element?

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.