Question

flammability is a material's ability to burn in the presence of a. hydrogen b. nitrogen c. oxygen d. carbon dioxide

Answer 1

Oxygen.

Further explanation

Chemical properties can be observed only when the substance changes into one or more different substances through chemical reactions or transformations. One of the chemical properties is flammability.

Flammability is a material's ability to burn in the presence of oxygen.

Remember, oxygen doesn't burn. Precisely flammable substances obtain substances that burn. Oxygen remains an oxidizing agent, which means it supports the combustion process. Oxygen causes other objects to catch fire at low temperatures and burns hotter and faster. But oxygen itself does not burn. Consequently, if you at present deliver fuel and fire, adding oxygen will provide the fire.

Carbon dioxide is the result of combustion. An example can be seen in firewood in a fireplace. One of the chemical properties of carbon-based wood is having the ability to burn. Chemically the wood turns into carbon dioxide when it burns and leaves a residue of ash. Furthermore, this ash residue cannot be turned back into the wood. Chemical changes result in new substances.

Consider an example of a combustion reaction to methane gas:

$\boxed{ \ CH_4_{(g)} + 2O_2_{(g)} \rightarrow CO_2_{(g)} + 2H_2O_{(g)} \ }$

Our balanced equation for methane combustion implies that every one CH₄ molecule reacts with two O₂ molecules. The product of combustion is one carbon dioxide molecule and two steam or water vapor molecules.

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Keywords: flammability, a material's ability to burn in the presence of oxygen, hydrogen, nitrogen, carbon dioxide, chemical properties, reactions,  the combustion process, oxidizing agent, the result

Answer 2

Flammability is a material's ability to burn in the presence of $\boxed{{\mathbf{c}}.\;{\mathbf{oxygen}}}$

Further Explanation:

Flammability of a substance can be defined as the property of substance which is a measure of its ability to burn. Most of the substance comes under the category of burning when a certain condition is fulfilled. The condition which needs to fulfill for burning the substance is presence of oxygen.

The process of burning in presence of oxygen is also known as combustion.

Combustion reaction is the reaction in which the reactant reacts with molecular oxygen to form carbon dioxide and water molecule. Molecular oxygen acts as the oxidizing agent in these reactions. The large amount of heat is released and therefore combustion reactions are exothermic reaction.

The example for a combustion reaction is burning of candle in presence of oxygen. We observe that when we light a candle and then put an inverted glass over the candle, the flame of the candle gets extinguished when all the oxygen trapped in the glass is used up.

Therefore, oxygen gas needs to present in order to measure the flammability of materials. Hence, the correct option is (b).

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Chemical reaction and equations.

Keywords: flammability, burn, hydrogen, nitrogen, carbon dioxide, reactions, combustion reaction, oxygen, the result, material's ability, presence of oxygen.