Oxygen and Chemical Equations

What is the atomic number of oxygen?

• 16

• 12

• 8

• 20

What is the chemical symbol for oxygen?

• O

• Ox

• Oxg

• Om

What are the physical properties of oxygen?

• Yellow, pungent, sour gas at room temperature

• Red, odorless, bitter gas at room temperature

• Blue, fragrant, sweet liquid at room temperature

• Colorless, odorless, tasteless gas at room temperature

What are the chemical reactions involving oxygen?

• Combustion, rusting, and respiration

• Oxidation, reduction, and ionization

• Evaporation, condensation, and sublimation

• Photosynthesis, fermentation, and distillation

How do you balance the chemical equation for the reaction of oxygen with hydrogen to form water?

• By removing one of the products from the equation

• By changing the chemical formula of the reactants

• By heating the reactants to a high temperature

• By adding coefficients to the reactants and products to balance the number of atoms of each element.

In the reaction of oxygen with iron to form iron oxide, what is the balanced chemical equation?

• 4Fe + 3O2 -> 2Fe2O3

• Fe + O2 -> FeO2

• 3Fe + 2O2 -> Fe3O2

• 2Fe + O2 -> Fe2O

What is the role of oxygen in combustion reactions?

• Oxygen acts as the oxidizing agent, allowing the fuel to undergo a chemical reaction that produces heat and light.

• Oxygen has no role in combustion reactions

• Oxygen acts as the cooling agent in combustion reactions

• Oxygen acts as the fuel and produces heat and light

What are some examples of combustion reactions involving oxygen?

• Photosynthesis in plants

• Freezing of water

• Rusting of iron

• Burning of wood, gasoline, or natural gas

How do you balance the chemical equation for the combustion of methane (CH4) in oxygen to form carbon dioxide and water?

• CH4 + 2O2 -> CO2 + H2O

• CH4 + 2O2 -> CO2 + 2H2O

• CH4 + O2 -> CO2 + H2O

• CH4 + 3O2 -> CO2 + 2H2O

What is the product of the combustion of magnesium in oxygen?

• Magnesium hydroxide (Mg(OH)2)

• Magnesium chloride (MgCl2)

• Magnesium oxide (MgO)

• Magnesium sulfate (MgSO4)