Iron (Fe) and diatomic oxygen (O2) combine to produce iron(III) oxide (Fe2O3). The table below compares the properties of these substances. Iron (Fe) Oxygen (O2) Iron(III) Oxide (Fe2O3) Melting Point (°C) 1538 −218.4 1565 Density (g/cm3) 7.83 0.00143 5.26 Appearance shiny, gray metal colorless, odorless gas red, odorless powder What can be concluded from this data? A. A chemical reaction occurred because iron(III) oxide has different properties than iron and diatomic oxygen. B. A chemical reaction occurred because iron(III) oxide has similar properties to iron and diatomic oxygen. C. A chemical reaction did not occur because iron(III) oxide is not a new substance. D. A chemical reaction did not occur because solid iron cannot chemically react with oxygen gas.

there all right good

explanation:

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.

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

the correct answer would be d. hope this !