The Physical Properties of Phosphorus are as follows: White phosphorous is white, waxy solid. It gives off a greenish-white glow . It glows in the dark, is spontaneously flammable when exposed to air and is deadly poison It does not dissolve well in water.
What are the physical and chemical properties of phosphorus?
Properties: The melting point of phosphorus (white) is 44.1°C, boiling point (white) is 280°C , specific gravity (white) is 1.82, (red) 2.20, (black) 2.25-2.69, with a valence of 3 or 5. There are four allotropic forms of phosphorus: two forms of white (or yellow), red, and black (or violet).
Why does white phosphorus glow in the dark?
White or yellow phosphorus glows in the dark due to its slow combustion in air . its energy of combustion is released as light. this property is known as phosphorescence.
Is the following a physical or chemical property graphite is a good lubricant?
Graphite has a layered, planar structure, as shown in Fig. ... Graphite’s ability to form a solid film lubricant comes from these two contrasting chemical bonds. The fact that weak Van der Waals forces govern the bonding between individual layers permits the layers to slide over one another, making it an ideal lubricant.
Is phosphorus a physical or chemical change?
Phosphorus is a chemical element with the symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Earth.
Is phosphorus a good conductor?
No, Phosphorus is not a good conductor of heat and electricity . Graphite is a good conductor of heat and electricity.
What are the dangers of phosphorus?
CHEMICAL DANGERS:
Phosphorus spontaneously ignites on contact with air , producing toxic fumes (phosphorus oxides). Phosphorus reacts violently with oxidants, halogens, some metals, nitrites, sulfur, and many other compounds, causing a fire and explosion hazard.
What are 5 chemical properties?
Examples of chemical properties include flammability, toxicity, acidity, reactivity (many types) , and heat of combustion.
What are two chemical properties of phosphorus?
| Atomic number 15 | Electronegativity according to Pauling 2,1 | Density 1,82 g/ml at 20°C | Melting point 44,2 °C | Boiling point 280 °C |
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Why is phosphorus called the devil’s element?
Phosphorus was discovered in 1669 by Hennig Brand in Germany. ... Only the white allotrope or form of phosphorus glows in the dark. Some texts refer to phosphorus as the “Devil’s Element” because of its eerie glow, tendency to burst into flame , and because it was the 13th known element.
Is white phosphorus a war crime?
George Monbiot stated that he believed the firing of white phosphorus by US forces directly at the combatants in Fallujah in order to flush them out so they could then be killed was in contravention of the Chemical Weapons Convention and, therefore, a war crime .
What does white phosphorus do to the human body?
Exposure to white phosphorus may cause burns and irritation, liver, kidney, heart, lung, or bone damage, and death . White phosphorus has been found in at least 77 of the 1,416 National Priorities List (NPL) sites identified by the Environmental Protection Agency (EPA).
Does white phosphorus burn underwater?
White phosphorus is highly reactive, and spontaneously ignites at about 30°C in moist air. ... It is usually stored under water , to prevent exposure to the air. It is also extremely toxic, even in very small quantities.
What is the useful properties of graphite?
It is unique in that it has properties of both a metal and a non-metal: it is flexible but not elastic, has a high thermal and electrical conductivity , and is highly refractory and chemically inert. Graphite has a low adsorption of X-rays and neutrons making it a particularly useful material in nuclear applications.
What are the properties and uses of graphite?
Graphite is used in pencils and lubricants . It is a good conductor of heat and electricity. Its high conductivity makes it useful in electronic products such as electrodes, batteries, and solar panels.
Is dissolving salt in water a physical or chemical property?
For example salt dissolving in water is usually considered to be a physical change , however the chemical species in salt solution (hydrated sodium and chlorine ions) are different from the species in solid salt.
