How To Pass Engineering Chemistry

  1. How To Pass Engineering Chemistry Lecture
  2. How To Pass College Chemistry
  3. How To Pass Chem
  4. How To Do Chemistry

Chemistry Books I Must Read To Pass JAMB In 2020. Read:- How To Avoid Distractions When You want to read. Chemistry is somewhat the most interesting subject as research has shown that chemistry practicals deal with reactions which lead to changes in color and stimulate understanding. Preparing to study chemistry. A summary of math and science knowledge to get you ready for learning chemistry on Khan Academy! Google Classroom Facebook Twitter. Introduction to the atom. Preparing to study chemistry. This is the currently selected item. Introduction to chemistry. Whether you're cramming for a test or trying to write and essay quickly, the last few weeks of school can be scary for students of all ages. The situation becomes even more stressful when you've only got one day to study for an important exam. While in General Engineering, students will complete a wide range of courses. The courses typically known as the 'first-year courses' are the change of major course requirements for engineering and include one semester of chemistry and lab, two semesters of English, two semesters of calculus, two semesters of foundations of engineering, and one semester of physics and lab.

Dialysis is the separation of colloids from dissolved ions or molecules of small dimensions, or crystalloid, in a solution. A colloid is any substance that is made of particles that are of an extremely small size: larger than atoms but generally have the size of 10-7 cm ranging to 10-3 cm. A crystalloid is a substance that has some or all of the properties of a crystal or a substance that forms a true solution and diffuses through a membrane by dialysis. Dialysis is a process that is like osmosis. Osmosis is the process in which there is a diffusion of a solvent through a semipermeable membrane.

Introduction

How To Pass Engineering Chemistry Lecture

In 1861, chemist Thomas Graham (how developed Graham's Law) used the process of dialysis, a process used to separate colloidal particles from dissolved ions or molecules. Dialysis is possible because of the unequal rates of diffusion through a semipermeable membrane. A semipermeable membrane is a membrane that lets some molecules to pass through it while not letting others (Figure (PageIndex{1})). Examples of semipermeable membranes include parchment and cellophane.

Figure (PageIndex{1}): Graphic showing the diffusion of solutes across a membrane during dialysis. from Wikipedia (Potcherboy)

Another way to think of a semipermeable membrane is to think of a net like object that traps larger objects, but lets smaller object pass through because they can pass through the holes in the net.

Video (PageIndex{1}): Osmotic Pressure Dialysis Tubing

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When a colloidal mixture is places in a semipermeable membrane, which is then placed in an aqueous solution or pure water, dissolved ions and small molecules are allowed to pass through this membrane. This causes colloidal particles to stay in the membrane, because these particles are unable to pass through the small pores of the membrane.

The Rate of Dialysis

Dialysis is not a quick process; the rate of dialysis depends on the speed of the unequal diffusion rates between the crystalloids and the colloids and the differences in particle size. The rate of dialysis can be changed through heating, or if the crystalloids are charged, then applying an electric field, called electrodialysis. Electrodialysis is the type of dialysis in which electrodes are placed on the sides of the membrane. In this way, positive ions can pass through one side of this membrane while the negatively charged ions can pass through the other side of the membrane. This causes acceleration in the process of dialysis.

Chemistry

How To Pass College Chemistry

Hemodialysis

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Hemodialysis is a method in which kidney failure is treated with the process of dialysis. In hemodialysis, blood is removed, purified through dialysis, and returned to the bloodstream. In kidney failure, there is a retention of salts and water, urea, and metabolic acids. The patient is then connected to a dialysis machine, which is also called a hemodialyzer. The blood flows through small channels made of semipermeable membranes (Figure (PageIndex{2})). The dissolved substances like urea and salts pass through a sterile solution. Compounds like sugar and amino acids are added to the sterile solution. The dialysis solution is on the other side of the membranes, and the molecules flow through the membranes. The molecules diffuse from a higher concentration to low concentration area. The concentrations of molecules needed to be removed from the blood are zero in the dialysis fluid.

The process of hemodialysis helps many patients who have kidney failure because a person who suffers from kidney failure are at great risk, because someone who has complete kidney failure will need a kidney transplant within two weeks, or else he/she will face death. Between the time that the person finds a suitable kidney to be transplanted, the hemodialyzer comes into great help in facing the fight against death.

References

How To Do Chemistry

  1. Petrucci, et al. General Chemistry Principles & Modern Applications. 9th ed. Upper Saddle River, NJ: Pearson Prentice Hall, 2007.
  2. Sadava, et al. Life: The Science of Biology. 8th ed. New York, NY. W.H. Freeman and Company, 2007.