Complete this sentence. if volume remains the same while the mass of a substance the density of the substance

If volume remains the same while the mass of a substance increases, the density of the substance will increase.

Explanation:

Mathematically D = m/V tells us that density is directly proportional to the mass and inversely proportional to volume. Therefore if the mass increases the density will also increase.

Analytically, density is mass per unit of volume. So if you had 500 kg of mass packed in a one cubic meter box, clearly your density would 500 kg per cubic meter. Now if you added another 500 kg of mass in that same box(volume unchanged) the density goes up to 1000 kg per cubic meter. So If volume remains the same while the mass of a substance increases, the density of the substance will increase.

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.

1.solid

2.carbon dioxide

3.helium