Table of Contents
Chemical properties of silicon – Health effects of silicon – Environmental effects of silicon Atomic number 14 Electronegativity according to Pauling 1.8 Density 2.33 g.cm – 3 at 20 °C Melting point 1410 °C Boiling point 3265 °C.
What are 2 physical properties of silicon?
Physical Properties of Silicon The atomic number of silicon is 14 and its relative atomic mass is 28.085 u. The density of silicon is 2.3296 gram per cubic centimeter. The silicon melting point is 1,410°C and the silicon boiling point is 3,265°C. Silicon in its purest form is an intrinsic semiconductor.
What are the physical properties of silicone?
Properties Low thermal conductivity. Low chemical reactivity. Low toxicity. Thermal stability (constancy of properties over a wide temperature range of −100 to 250 °C) The ability to repel water and form watertight seals. Does not stick to many substrates, but adheres very well to others, e.g. glass.
What is the coolest element?
Sulfur. You usually think of sulfur as a yellow rock or powder, but one of the cool things about this element is that it changes color under different conditions. Solid sulfur is yellow, but it melts into a blood-red liquid. If you burn sulfur, the flame is blue.
What are the properties and uses of silicon?
Uses of Silicon The element is a major constituent in ceramics and bricks. Being a semiconductor, the element is put into use for making transistors. Silicon is widely used in computer chips and solar cells. It is a vital component of Portland cement. Silicon is used in the production of fire bricks.
Why is silicon used?
Silicon is used for electronic devices because it is an element with very special properties. One of it’s most important properties is that it is a semiconductor. This means that it conducts electricity under some conditions and acts as an insulator under others. Silicon is also an abundant element on Earth.
What are 2 uses of silicon?
Silicon is one of the most useful elements to mankind. Most is used to make alloys including aluminium-silicon and ferro-silicon (iron-silicon). These are used to make dynamo and transformer plates, engine blocks, cylinder heads and machine tools and to deoxidise steel. Silicon is also used to make silicones.
Why is graphite a poor conductor at high temperatures?
Graphite is an allotrope of carbon. At higher temperature, graphite has an intermolecular structure with immobile ions. Thus, this makes graphite a poor conductor.
Why is silica bad for you?
Breathing in very small (“respirable”) crystalline silica particles, causes multiple diseases, including silicosis, an incurable lung disease that leads to disability and death. Respirable crystalline silica also causes lung cancer, chronic obstructive pulmonary disease (COPD), and kidney disease.
Is silicon a human body?
The highest silicon content in the body was found in connective tissue, bones, kidneys, liver, skin, spleen and lungs. The element is present in all tissues, but its content decreases with age; lower elemental concentrations are also observed in some pathological conditions (e.g. ischemic heart disease).
How is silicon used in everyday life?
Silicon is one of man’s most useful elements. In the form of sand and clay it is used to make concrete and brick; it is a useful refractory material for high-temperature work, and in the form of silicates it is used in making enamels, pottery, etc. Silicon tetrachloride can be used as iridize glass.
Is silicone toxic when burned?
Fire Resistance: Silicone is difficult to ignite, and when it does burn it burns to a non-conductive ash. While burning, silicone does not give off toxic materials.
Where is silicon in our body?
Silicon is present in all body tissues, but the tissues with the highest concentrations of silicon are bone and other connective tissue including skin, hair, arteries, and nails [14]. In vitro studies have demonstrated that silicon stimulates type 1 collagen synthesis and osteoblast differentiation [32].
Is silicone bad conductor of electricity?
Note: Pure silicon are weak conductors of electricity because their outer electrons are bound together in the covalent bonds of the diamond frame. Electrical conductivity decreases as the temperature of the metals increases, since the motions of the atoms make the passage of electrons more difficult.
Is silicon harmful to humans?
Health effects of silicon Silicon is non-toxic as the element and in all its natural forms, nameli silica and silicates, which are the most abundant. Silicon may cause chronic respiratory effects. Crystalline silica (silicon dioxide) is a potent respiratory hazard.
Is silicone sealant flammable?
Silicone is not considered to be flammable. It can catch fire and burn but requires high temperatures to do so. The ignition temperature of silicone is 842 degrees Fahrenheit (450 Celsius).
Is silicon used in glass?
Silica, otherwise known as industrial sand, provides the most important ingredient for glass production. Silica sand provides the essential Silicon Dioxide (SiO2) required for glass formulation, which makes silica the primary component in all types of standard and specialty glass.
Is diamond a good conductor of electricity?
In a graphite molecule, one valence electron of each carbon atom remains free, Thus making graphite a good conductor of electricity. Whereas in diamond, they have no free mobile electron. Hence there won’t be flow of electrons That is the reason behind diamond are bad conductor electricity.
Is silicon a good conductor of heat?
Silicone has a low thermal conductivity, which means that it transfers heat at a low rate compared to other materials. This low thermal conductivity can also be described as high thermal (heat) resistance. Fundamentally, this heat resistance is due to the highly stable chemical structure of silicone.
What are the side effects of silicon?
People can experience adverse effects of silicon dioxide if they inhale the fine particles. Long-term exposure to silica dust may pose a serious risk to health.Adverse effects silicosis, a progressive, irreversible lung disease. lung cancer. chronic obstructive pulmonary disease, or COPD. increased risk of tuberculosis.
What are silicones how they are classified?
silicone, also called polysiloxane, any of a diverse class of fluids, resins, or elastomers based on polymerized siloxanes, substances whose molecules consist of chains made of alternating silicon and oxygen atoms.
What is the Colour of silicon?
Pure silicon is a hard, dark gray solid with a metallic lustre and with a octahedral crystalline structure the same as that of the diamond form of carbon, to which silicon shows many chemical and physical similarities.
