Which of the following are the least dense materials shown? rock- 1000g, 0.5l(liters) pillow- 200g, 10l(liters) bottle of soda- 2000g, 2l(liters) loaf of bread- 100g, 1l(liter) loaf of bread and rock? rock and bottle of soda? loaf of bread and pillow? bottle of soda and loaf of bread?

Option (c) is the correct answer.

Explanation:

Density is the measure of mass per liter of volume. The formula to calculate density is as follows.

                =

A substance with less density is the least dense and vice versa.

The density of rock is calculated as follows.

                        =

                                   =

                                   = 200 g/L

The density of pillow is calculated as follows.

                            =

                                =

                                = 20 g/L

The density of bottle of soda is calculated as follows.

                          =

                               =

                               = 1000 g/L

The density of loaf of bread is calculated as follows.

                        =

                               =

                               = 100 g/L

Thus, we can conclude that loaf of bread and pillow are the least dense materials shown.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.