Thursday, September 23, 2010

solubility curves

Let us learn about solubility curves

a) Solubility curves give a general idea about the ability of a solute to dissolve in water, at different temperatures.

b) The solubility of the solute at any temperature, between the mentioned highest & lowest temperatures, can be more or less accurately read.

c) The mass of crystals deposited, when a saturated solution cooled from a higher to a lower temperature& can be calculated.

Best Example

As per the given graph, the solubility of potassium nitrate at 60oC= 110 g and at 50oC = 91 g.

Therefore, by cooling a saturated solution of potassium nitrate containing 100 g of water from 60oC to 50oC, 19 g of the solute (110 g - 91 g) is deposited in the form of crystals.

In our next blog we shall learn about cell potential I hope the above explanation was useful.Keep reading and leave your comments.

Wednesday, September 22, 2010


Let us learn about guttation

Guttation is referred as the appearance of drops of xylem sap on the tips or edges of leaves of some vascular plants, best example grasses. Guttation is not to be confused with dew that condenses from the atmosphere onto the plant surface.

The loss of excess water in liquid drops from margins of leaves of plants, when root pressure is high & transpiration is low.

  • This method is very common during warm humid nights.
  • This method occurs in plants growing in high soil moisture.
  • Guttation occurs through specialized pores known as hydathodes present near the vein endings.

In our next blog we shall learn about ge online bill pay I hope the above explanation was useful.Keep reading and leave your comments.

Monday, September 20, 2010

diluting acid

Let us learn about diluting acid

Properties of dilute nitric acid

1. The color of the dilute nitric acid differs from colorless to yellowish liquid.

2. Dilute nitric acid has suffocating & acrid odor.

3. Dilute nitric Acid is always infinitely soluble in water.

4. Specific gravity of dilute nitric acid is always 1.41

5. Dilute nitric acid boils at 1220C & melts at -420C .

6. Dilute nitric acid is stable under ordinary conditions but containers may burst when heated.

7. Being a strong acid dilute nitric acid reacts with alkalis, basic oxides & carbonates to form salts.

8. When dilute nitric acid is reacts with steam & water it produces toxic & corrosive fumes.

9. dilute nitric acid has -1.4 acid dissociation constant

In our next blog we shall learn about ethene I hope the above explanation was useful.Keep reading and leave your comments.

Sunday, September 19, 2010

water absorption

Let us learn about water absorption

The quantity of water absorbed by a composite material, when immersed in water occurs for a stipulated period of time. The ratio of weighted water absorbed by a material so to the weight of the dry materials. All organic polymeric materials will fascinate moisture to some extent resulting in swelling, leaching, dissolving, plasticizing and/or hydrolyzing, events which can result in discoloration, embitterment, loss of mechanical and electrical properties, lower resistance to heat and weathering and stress cracking

Water absorption is used to determine the quantity of water absorbed under specified conditions. Factors affecting water absorption consist: type of plastic, additives used, temperature & length of exposure. The data sheds light on the implementation of the materials in water or humid environments.

In our next blog we shall learn about english tutoring I hope the above explanation was useful.Keep reading and leave your comments.

Thursday, September 16, 2010

physics classroom tutorial

Let us learn about physics classroom tutorial

Physics classroom tutorial is a science which deals with matter & energy & their interactions; physics classroom tutorial can be really hard to visualize such things as Newton's Laws, sound waves, or refractions of light. The physics classroom tutorial helps students learn basic Physics concepts through tutoring especially for high school students. Each lesson provides an opportunity to assess student mastery of the material & they can check their understanding with quizzes. Student can get help with 1-D Kinematics, Motion & Forces in 2 Dimension, Circular Motion, Light Waves & Color, & much more. Visit the Multimedia Physics Studio to visualize student lessons, or hone in your skills by completing graphing problems, recognizing forces, identifying vector magnitude & direction, & practicing vector addition. These simplified explanations & colorful visual demonstrations will make student wonder why Physics was such a complicated subject in the first place!

Physics classroom tutorial is an online physics tutoring written for introductory physics students & tutors. Through individual lessons & accompanying quizzes, multimedia, & problem solving help, this very informative site covers physics from Newton's Laws to Refraction. The Multimedia & Shockwave Physics Studios give excellent animations & movies which allow students to reinforce their learning through visualizations. The review & problem solving modules help students study & the tutor tools provide lessons & student activities.

In our next blog we shall learn about provides english word definitions I hope the above explanation was useful.Keep reading and leave your comments.

Wednesday, September 15, 2010

chemical properties of oxygen

Let us learn about chemical properties of oxygen

Oxygen is the important element in the respiratory processes of most of the living cells & in combustion processes.

Oxygen gas supports combustion, combines with most elements, & oxygen is a component of hundreds of thousands of organic compounds.

Oxygen gas can be separated from air by fractionated liquefaction & distillation.

Oxygen is a reactive oxidizing agent.

Its Para magnetism is very strong.

Liquid oxygen is also considered as slightly paramagnetic.

Ozone is a highly reactive & powerful reactive agent. Oxygen gas is a colorless, odorless gas with the molecular formula O2, in which the 2 oxygen atoms are chemically bonded to each other. Oxygen has atomic number eight & it is represented by the symbol O. Oxygen is a member of the halogens group on the periodic table, & it is a highly reactive nonmetallic period 2 element which readily forms compounds with almost all other elements. Atomic Number of oxygen: 8 Atomic Radius: 66 pm Atomic Symbol: O Melting Point of oxygen: -218.79 C Atomic Weight of oxygen: 15.9994 Boiling Point of oxygen: -182.95

In our next blog we shall learn about online narrator I hope the above explanation was useful.Keep reading and leave your comments.

chemistry tutors

Let us learn about skills of chemistry tutors

Chemistry is a very important subject & Chemistry is essential if you are planning to read medicine, dentistry or pharmacy at university. Chemistry tutors begins with the fundamentals & gives expert help with the most difficult phases of understanding your first course in chemistry. Chemistry tutors is not necessarily a complete text for your course or a complete outline, but we are proud to offer some insightful help in the parts of primary chemistry that have been, from our experience, the hardest for students to grasp. Chemistry tutors can be a part of a course of study for independent students, a resource for chemistry teachers, a review, or a tutoring program for students taking high school or basic college chemistry.

Chemistry tutors is a teacher that is able to help the student gain a working understanding of the subject matter.

A good chemistry tutors is able to quickly assess the student's needs and help fill in gaps and/or help the student to have a understanding so they are able to do their homework themselves.

A good chemistry tutors is 1 who can work with each student individually to address his or her specific needs. A good chemistry tutors will motivate, encourages, & inspire. A good chemistry tutors is able to explain complex concepts in a way that makes them seem simple or clear.

In our next blog we shall learn about fibrous joints I hope the above explanation was useful.Keep reading and leave your comments.