Question

"Identify the reactants and products in the following chemical equation:

O2 + 2H2 ➞ 2H2O

Also, make a list of chemical reactions that you have seen and the signs of a chemical change."

Answer 1

In the reaction O2 + 2H2 → 2H2O, the reactants are O2 and H2, and the product is H2O. Signs of a chemical change include color change, temperature change, gas production, and formation of a precipitate.

Step-by-step explanation:

In the chemical equation O2 + 2H2 → 2H2O, the reactants are diatomic oxygen (O2) and diatomic hydrogen (H2), while the products are water molecules (H2O). Typically, you can discern the reactants and products by noting that reactants are listed on the left side of the reaction arrow and products on the right.

Common signs of a chemical change include color change, temperature change, gas production, and precipitate formation. Here are some examples of chemical reactions you might have seen:

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• Iron rusting (Fe + O2 → Fe2O3) - typically signaled by a change in color and texture.
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• Combustion of propane in a grill (C3H8 + 5O2 → 3CO2 + 4H2O) - indicated by heat production and light.
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• Vinegar reacting with baking soda (CH3COOH + NaHCO3 → CO2 + H2O + Na+ + CH3COO-) - production of gas bubbles and temperature change.