Fastest gets 30match the term with the definition. malleability a) how much heat is given off when a substance is burned flammability b) the ability of a substance to damage or harm an organism heat of combustion c) how easily a substance can be set on fire toxicity d) the ability of a solid to bend or be hammered into a new shape match the term with the definition. evaporation a) a phase change from a solid to a gas melting b) a phase change from a liquid to a gas sublimation c) a phase change from a solid to a liquid freezing d) a phase change from a liquid to a solid match the term with the example that shows its definition. molecular composition a) water has two hydrogen atoms and one oxygen atom flammability b) gasoline catches fire heat of combustion c) high lead levels in a lake kill fish toxicity d) the burning of coal releases heat

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answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form() .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.