Презентация Silicon. Silicate minerals. Weathering онлайн

Содержание слайда: K.A.Yasawi  International Kazakh-Turkish University K.A.Yasawi  International Kazakh-Turkish University Natural sciences faculty Ecology and chemistry department Case study Theme: Silicon. Silicate minerals. Weathering Performed: Nazar E. Adopted: Nurdillayeva R.

Содержание слайда:

Содержание слайда: Silicon is a chemical element with symbol Si and atomic number 14. A hard and brittle crystalline solid with a blue-gray metallic luster, it is a tetravalent metalloid. It is a member of group 14 in the periodic table, along with carbon above it and germanium, tin,lead, and flerovium below. It is rather unreactive, though less so than germanium, and has great chemical affinity for oxygen; as such, it was first prepared and characterized in pure form only in 1823 by Jöns Jakob Berzelius. Silicon is a chemical element with symbol Si and atomic number 14. A hard and brittle crystalline solid with a blue-gray metallic luster, it is a tetravalent metalloid. It is a member of group 14 in the periodic table, along with carbon above it and germanium, tin,lead, and flerovium below. It is rather unreactive, though less so than germanium, and has great chemical affinity for oxygen; as such, it was first prepared and characterized in pure form only in 1823 by Jöns Jakob Berzelius.

Содержание слайда: Production Ferrosilicon, an iron-silicon alloy that contains varying ratios of elemental silicon and iron, accounts for about 80% of the world's production of elemental silicon, with China, the leading supplier of elemental silicon, providing 4.6 million tonnes (or 2/3 of the world output) of silicon, most of which is in the form of ferrosilicon. It is followed by Russia (610,000 t), Norway (330,000 t), Brazil (240,000 t) and the United States (170,000 t). Ferrosilicon is primarily used by the iron and steel industry (see below) with primary use as alloying addition in iron or steel and for de-oxidation of steel in integrated steel plants.

Содержание слайда: Health effects of silicon Silicon concentrates in no particular organ of the body but is found mainly in in connective tissues and skin. Silicon is non-toxic as the element and in all its natural forms, nameli silica and silicates, which are the most abundant. Silicon crystalline irritates the skin and eyes on contact. Inhalation will cause irritation to the lungs and mucus membrane. Irritation to the eyes will cause watering and redness. Reddening, scaling, and itching are characteristics of skin inflammation.

Содержание слайда: Silicate minerals are rock-forming minerals made up of silicate groups. They are the largest and most important class of rock-forming minerals and make up approximately 90 percent of the Earth's crust. They are classified based on the structure of theirsilicate groups, which contain different ratios of silicon and oxygen. Silicate minerals are rock-forming minerals made up of silicate groups. They are the largest and most important class of rock-forming minerals and make up approximately 90 percent of the Earth's crust. They are classified based on the structure of theirsilicate groups, which contain different ratios of silicon and oxygen.

Содержание слайда: Silicate minerals Quartz SiO2 Quartz is one of the most common mineral in Earth’s crust! Silica (Si) and Oxygen (O) are the only elements within pure quartz. If a cooling magma has silica leftover after feldsparsform, quartz is likely to form. Quartz can be found in all sorts of rocks. Igneous rocks sometimes contain large quartz crystals. Metamorphic rocks such as gneiss also have large quartz crystals. Sedimentary rocks such as sandstone are often made of tons of little pieces of quartz crystals. In fact, most sand is made of quartz because it is hard and does not weather away easily. Some pieces of quartz are white like milk but most are clear like glass, sometimes with a little pink or gray tinge of color.

Содержание слайда: Weathering Weathering is the breaking down of rocks, soil and minerals as well as wood and artificial materials through contact with theEarth's atmosphere, waters and biological organisms. Weathering occurs in situ (on site), that is, in the same place, with little or no movement, and thus should not be confused with erosion, which involves the movement of rocks and minerals by agents such as water, ice, snow, wind, waves and gravity and then being transported and deposited in other locations.

Содержание слайда: Rocks gradually wear away. This is called weathering. There are three types of weathering: 1.physical weathering 2.chemical weathering 3.biological weathering 1)Physical weathering Physical weathering is caused by physical changes such as changes in temperature, freezing and thawing, and the effects of wind, rain and waves. Wind, rain and waves Wind, rain and waves can all cause weathering. The wind can blow tiny grains of sand against a rock. These wear the rock away and weather it. Rain and waves can also wear away rock over long periods of time.

Содержание слайда:

Содержание слайда:

Содержание слайда: