What is oxidation?

• Oxidation is the gain of electrons by a substance.

• Oxidation is the loss of electrons by a substance.

• Oxidation is the process of combining with hydrogen.

• Oxidation is a type of chemical reaction that does not involve electrons.

How does combustion relate to oxidation?

• Combustion is a process that does not involve oxidation.

• Combustion is a type of oxidation reaction.

• Oxidation is the opposite of combustion.

• Combustion occurs only in the absence of oxygen.

What is a chemical reaction involving oxygen called?

• Oxidation

• Fermentation

• Combustion

• Synthesis

Can you name a common example of combustion?

• Melting ice in the sun

• Cooking pasta on a stove

• Burning wood in a fireplace

• Rusting metal in the rain

What are the products of a complete combustion reaction?

• Oxygen and nitrogen

• Methane and sulfur dioxide

• Carbon monoxide and hydrogen

• Carbon dioxide and water

What role does oxygen play in combustion?

• Oxygen acts as a reactant that enables the combustion process by reacting with fuel to produce energy.

• Oxygen is a byproduct of combustion.

• Oxygen cools down the combustion process.

• Oxygen is not necessary for combustion to occur.

What is the difference between oxidation and reduction?

• Oxidation occurs only in acidic conditions; reduction occurs only in basic conditions.

• Oxidation involves loss of electrons; reduction involves gain of electrons.

• Oxidation and reduction are the same process.

• Oxidation involves gain of electrons; reduction involves loss of electrons.

What are some sources of oxygen in our environment?

• Respiration by animals

• Photosynthesis by plants, algae, and bacteria; gas exchange in oceans; decomposition of organic matter.

• Chemical reactions in the atmosphere

• Burning fossil fuels

How does photosynthesis contribute to oxygen levels?

• Photosynthesis increases oxygen levels by releasing oxygen as a byproduct during the conversion of carbon dioxide and water into glucose.

• Photosynthesis produces carbon dioxide as a byproduct, reducing oxygen levels.

• Photosynthesis has no effect on oxygen levels in the atmosphere.

• Photosynthesis decreases oxygen levels by consuming oxygen during glucose production.

What is the chemical formula for oxygen?

• CO2

• O2

• O3

• H2O