If the temperature of a 1.75 liter sample of gas is changed from 30.0°c to 20.0°c at constant pressure, what will be the new volume? question 3 options:

According to Charles' law, "at constant pressure the volume of a gas is directly proportional to absolute temperature".

So, for a gas, initial and final states are given as,

                      V₁ / T₁  =  V₂ / T₂

Data Given:
                   V₁  =  1.75 L

                   T₁  =  30 °C + 273  =  303 K

                   V₂  =  ?

                   T₂  =  20 °C + 273  =  293 K

Solving Eq. 1 for V₂,

                        V₂  =  V₁ T₂ / T₁

Putting Values,

                        V₂  =  (1.75 L ×  293 K) ÷ 303 K

                        V₂  =  1.69 L
Result:
            As temperature is decreased so volume has also decreased to 1.69 L.

Cells contain chromosomes which are made up of genes. Genes are made up of tightly wound strands of DNA.

Explanation:

A DNA (Deoxyribonucleic acid ) is a double-helix structure which carries the genetic information. Gene is a segment of DNA that carries basic information/instruction for growth and development. It is a basic unit of heredity that passes from parents to offspring. Chromosomes contain genes. Chromosomes are found in cells.

Thus, a cell contains chromosomes which as genes. A gene is a segment of DNA.