Experiment C: Properties of a Newspaper Purpose: To observe the properties of a

Question

Experiment C: Properties of a Newspaper

Purpose: To observe the properties of a common polymer, a newspaper.

Obtain a piece of newspaper and tear it in one direction. Observe the tear. Rotate a second piece of newspaper one quarter turn and tear it. Observe the tear. Is there a difference in the two tears? Explain.

Most inexpensive newsprint paper is made from the polymer cellulose, which is derived from wood pulp. In the polymer cellulose, in one direction the atoms are held together through strong chemical bonds;? in the other direction, the parallel cellulose chains are held to each other through weaker intermolecular forces. Therefore, when you tear the paper in one direction the paper will tear in a fairly straight line;? when you rotate the paper 90 degrees, the tear will typically produce a jagged line.

In your conclusions, explain your observations in your own words. When a fairly straight line was produced, were you tearing the paper parallel or perpendicular to the cellulose fibers? How about when a jagged line was produced?

Write obersations and summary

Explanation / Answer

Yes, there is difference in tearing depending on direction of tearing.

We will find that it tears easily vertically, but not easily horizontally. Vertical tears are pretty straight, but horizontal tears end up jagged.

Observations:

Most inexpensive newsprint paper is made from the polymer cellulose, which is derived from wood pulp it is correct and, "in the polymer cellulose, in one direction the atoms are held together through strong chemical bonds and in the other direction, the parallel cellulose chains are held to each other through weaker intermolecular forces" it is also correct because, carbon is the most important element in polymers. And it starts with only four valence electrons, and wants to share four more, carbon forms a wide variety of covalent bonds. Long, strong chains or nets made of thousands of carbon atoms form the backbone of a polymer. cellulose is composed of long chains of sugar rings and covered with alcohol groups which shows intermolecular forces between them.Therefore, when we tear the paper in one direction the paper will tear in a fairly straight line, while when we rotate the paper 90 degrees, the tear will produce a jagged line.

Explanation:

A sheet of paper is made up of many disrieat cellulose fibers bonded together. Tearing is based on the directions of the fibers of the paper. If we try to tear newspaper, we'll find that it tears easily vertically, but not easily horizontally. Vertical tears are pretty straight, but horizontal tears end up jagged because the way of paper tears is related directly to how it is made. Most paper is made from wood fibers. The soupy mush called pulp which is pressed onto a mesh conveyor belt that squeezes the water out. As the pulp moves along the belt the wood fibers line up in the direction of the belt’s travel. This alignment of the fibers on the belt gives the paper a grain this grain is causes the paper to tear straight line in one way than the other. When paper is ripped with the grain the tear goes with the direction of the fibers, and is fairly straight. When we tear the paper across the grain the tear tends to wander as it works against the direction of the fibers.

Summary:

Tearing is based on the directions of the fibers of the paper. If we try to tear newspaper in the direction (parallel) of fiber line which is aligned vertically due to mesh conveyor belt travel, we'll find that it tears easily in straight line, but not easily in perpendicular and other directions, which tears end up jagged.

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