Astudent is shown a simple model of particles that make up a liquid,as shown. how should the model be changed to show the particles of a solid? a. increase the velocities of the particles, and increase the space between the particles b. increase the velocities of the particles, and decrease the space between the particles c. decrease the velocities of the particles, and increase the space between the particles d. decrease the velocities of the particles, and decrease the space between the particles

            Option-D : Decrease the velocities of the particles, and decrease the space between the particles.

Explanation:
                     The solid state of matter is composed of particles closely packed with a minimum space between them. This closed packing of particles occur due to strong interatomic or intermolecular interactions between particles. Therefore, solids particles have zero translational and rotational motions and only show vibrational motions. So, decrease in velocity and decrease in space between particles is the right answer for making solids.

The thread that connects the pearls is like an ionic bond.

Explanation:

Polymers are macromolecules conformed by several monomers (precisely how several pearls connected together form one pearl necklace). These monomers are bonded together through a process known as polymerization (just like stringing the beads together in the necklace).

However, the bonds between the monomers are not ionic, they are covalent. Polymers are usually made from organic compounds, and as such they have C-C, C-H, C-N and C-O bonds, which are covalent.