How the world works by Malek Ahmed https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd en-us 2021-11-09 15:00:10 UTC 2025-10-22 17:29:18 UTC hello@padlet.com https://padlet.net/icons/png/1f30e.png Scientists use materials to make inventions https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1879498748 From 1879, Thomas Edison demonstrated his invention of the light bulb for the first time in a special show. Thomas Edison is not an ordinary person, as he is the fourth most prolific inventor. He owned 1,093 US patents, along with many patents in France and Germany.
Aya mohamed ]]> 2021-11-09 21:11:49 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1879498748 The solid state mohabpilotenshaaalla https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881443465 The solid state of matter is characterized by having a specific shape and size, due to the strong and close bonding of the particles that make up the material with each other, which carry slow movement, and solids are usually crystalline in shape. Examples of crystalline solids include sugar, table salt, diamonds, and many other minerals, and materials in the solid state also include other examples, such as rocks and wood at room temperature, and solids can form when liquid or gaseous materials are cooled. Ice is an example of a substance that has changed from a liquid to a solid by cooling]]> 2021-11-10 14:32:23 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881443465 the liquid state mohabpilotenshaaalla https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881458209 Substances in the liquid state have a specific volume, but their shape is not fixed, as they take the shape of the container that contains them. Examples of substances in the liquid state are water and oil. Liquid substances can be formed by cooling gases, as is the case with water vapor; This is due to the slowing down of the speed of the gas molecules resulting from its cooling, in addition to its loss of energy, and the state of the material can change from solid to liquid when it is heated. the heat]]> 2021-11-10 14:36:41 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881458209 the gaseous state mohabpilotenshaaalla https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881491798 Gas is one of the three principle states of matter. The properties of gases are distinctly different from those of liquids and solids—the other principle states. Gases have neither a definite volume nor a definite shape. In contrast, both solids and liquids have a definite volume, and solids have a fixed shape. Liquids lack a shape of their own but take on the shape of the vessel that contains them. Gases will fill any closed container; However, this property depends on the volume of the container and not its shape.]]> 2021-11-10 14:46:41 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881491798 There are four common states of matter in the universe: solid, liquid, gas, and plasma. The state of matter affects a substance's properties, such as density, viscosity well it , malleability easy , and conductivity. ibrahimabdelhamied2011 https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881575315 2021-11-10 15:11:36 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881575315 The wood material https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881609460 Properties of wood :    Wood has not a certain properties because you can shape and color it as you can except its Sold material.


Uses of wood :
1- Paper made 
2- Home furniture 
3- musical instruments.

Types of wood : 
Red Wood 
Ash Wood 
Bamboo Wood 
Brown Wood 
Etc..... By... Razan Ahmed]]> 2021-11-10 15:22:17 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881609460 What are materials? salmaaboghazala10 https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881656743 Materials are all around us, They are substance used to make something, Materials can be natural or man made, Look at clothes,  phones and tables they all are made of materials. ]]> 2021-11-10 15:36:49 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881656743 mohamedomar123hassan https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881704051
Copper is a chemical element. It is the 29th element in the periodic table. Its mass number is 63.55.. The symbol for copper is "Cu", which comes from the Latin word cuprum, which, in turn, came from the Latin word for the island of Cyprus, where copper was found.
good heat conductivity.
Excellent electrical conductivity
melting point 1083°C
and boiling point 2595°C
it is physical change Copper is used mostly in its metal form. About 60% of the copper produced is used for electrical wiring and cable. Copper is an excellent material for wiring because of its electrical conductivity, ductility, corrosion resistance, low thermal expansion, and tensile strength.
]]> 2021-11-10 15:52:08 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881704051 farah farahmostafafarouk https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881855246  Chemical Changes and Examples of Chemical Changes
new compound (product) results from a chemical change as the atoms rearrange themselves to form new chemical bonds. A chemical change always involves a chemical reaction. The starting materials and final product are chemically different from one another. 
Here are some examples of chemical changes;
Burning wood
Souring milk
Mixing acid and base
Digesting food
Cooking an egg
Heating sugar to form caramel
Baking a cake
Rusting of iron]]> 2021-11-10 16:43:29 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881855246 farah mostafa farahmostafafarouk https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881883484
Physical changes involve states of matter and energy. No new substance is created during a physical change, although the matter takes a different form. The size, shape, and color of matter may change. Physical changes occur when substances are mixed but don't chemically react.



How to Identify a Physical Change

One way to identify a physical change is that such a change may be reversible, especially a phase change. For example, if you freeze water into an ice cube, you can melt it into the water again. Ask yourself 
Physical and Chemical Properties of Matter
  • Is the change reversible? Not all physical changes are easy to reverse.
  • Was there a color change (with exceptions), bubble formation, or formation of a precipitate? These are all signs of a chemical change, not a physical change.
  • Is the chemical identity of the end product the same as it was before the change? If the answer is yes, it's a physical change. If the answer is no, it's a chemical change.


Examples of Physical Changes

Remember, the appearance of matter changes in a physical change, but its chemical identity remains the same.

  • Crushing a can
  • Melting an ice cube
  • Boiling water
  • Mixing sand and water
  • Breaking a glass
  • Dissolving sugar and water
  • Shredding paper
  • Chopping wood
  • Mixing red and green marbles
  • Sublimation of dry ice
  • Crumpling a paper bag
  • Melting solid sulfur into liquid sulfur. This is an interesting example since the state change does cause a color change, even though the chemical composition is the same before and after the change. Several nonmetals, such as oxygen and radon, change color as they change phase.
  • Chopping an apple
  • Mixing salt and sand
  • Filling a candy bowl with different candies
  • Vaporizing liquid nitrogen
  • Mixing flour, salt, and sugar
  • Mixing water and oil


Indications of a Chemical Change

Sometimes the easiest way to identify a physical change is to rule out the possibility of a chemical change. There may be several indications that a chemical reaction has occurred. Note: It's possible for a substance to change color or temperature during a physical change.

  • Evolving bubbles or releasing gas
  • Absorbing or releasing heat
  • Changing color
  • Releasing an odor
  • Inability to reverse the change
  • Precipitation of a solid from a liquid solution

]]> 2021-11-10 16:53:59 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881883484 Gold*Properties of gold : 1-Gold conducts heat and electricity: Copper and silver are the best conductors, but gold connections outlast both of them because they do not tarnish2-Gold is ductile and malleable : It can be drawn out into the thinnest wire.3-Gold is highly reflective of heat and light: The gold reduces glare and heat from sunlight.4- Gold is prized for its beauty: It as a metal that can be embossed, hammered, cast, stretched Uses of gold : 1-Finance and bullion 2-Jewellery, medals. 3-Medication and dentistry. 4-Aerospace and electronics bullion gold zeinaabdelmonem https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881894528 2021-11-10 16:57:54 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881894528 what are the aluminumwhat are the properties of aluminum? Color and State: Solid, nonmagnetic, non-lustrous, silvery-white with slight bluish tint.Surface: Aluminum surfaces can be highly reflective.Ductility: High ductility. Aluminum can be beaten very thin. Malleability: High malleability. Aluminum is very capable of being shaped or bent.Conductivity: Good electrical and thermal conductor.what are the uses of aluminum?Power lines. High-rise buildings. Window frames. Consumer electronics. ...Household and industrial appliances. Aircraft components. Spacecraft components. Ships. zeinaabdelmonem https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881916355 2021-11-10 17:05:55 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881916355 change material from state to state omarabdelmotgaly https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881943245 we use changing material in alot of things
                                                           like  
alumiunum and iron use in ships
 alumiunum  and copper use in planes
 iron use in cars
 there was physical change and chemical change
change from solid to liuquid and gas
and so many changes 
thats chages we use it in
future things and now things]]> 2021-11-10 17:15:52 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881943245 Materials are the substances that anything is made from. Doors, for example, can be made from iron, wood or glass. Different materials have different properties. If we look at glass we find it transparent, hard but can be broken. Wood is strong and stiff, it can be hard or soft. Plastic also is a very useful material that can be transparent or opaque, hard or soft, and has many colors.We also have metals and non-metals which are opposite. Metals are shiny and have high melting point, good electrical and heat conductivity. Iron, Aluminum and copper are all metals. Non-metals are not shiny and have low melting point, bad and heat conductivity. Carbon, sulphur and phosphorus are all non-metals, but only carbon is a good conductor of electricity. mohamedaliaborehab2011 https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881999071 Mohammed Ali]]> 2021-11-10 17:36:56 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1881999071 Transitions of material. Turnovers money money is anything that occupies space and possesses mass. The main cause of a material's transformation is its possession or release of energy to shift from one state to another.They go through the stages of being the three solid States.Liquid.And the gaseous Kalati .. Melting is the transition from solid to liquid usually by heating. Antifreeze. Is the transition from liquid to solid, and usually is done by cooling down the heat .Evaporation.It is the transformation from liquid to gas via the boiling process .Condensation is the transformation from gaseous to liquid via a pressing process .Sublimation is the transition from solid to gaseous directly. Sedimentation is the transition from gaseous to solid directly https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1882091170 Ziad Ahmed]]> 2021-11-10 18:14:27 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1882091170 Introduction to the material https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1882157193 Materials is important in human life. From materials many things are made and many things we using in our life. We will talk about the properties, uses, place and material evolution . ]]> 2021-11-10 18:42:35 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1882157193 the wood https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1882167235 it is considered one of the most important resources in nature, and it is known to be a hygroscopic, porous, and moldable organic substance. wood respomds to external infoluences,  and is taken from plants. it has many characteristics, including being easily fromed, easy to obtain, durable, hardness, and easy to cut. 
wood uses 
wood is used in the construction of houses and flres, and in the manufacture of doors, stairs and windows, and in the desing of models for designers, and in wood industries such as shipbuilding, cart manufacture, weapons manufacture, and wooden furniture. 
the chemical composition of wood 
wood consists of six percent hydrogen, forty-nine percent carbon, alittle nitrogen, and ash 0.1 percent. it also consists of silica, potassium, magnesium, calci um and manganese. 
physical and mechanical propertise of wood
the phsysical properties of wood are: weight, taste, smell, and luster, which are necessary characterics that distinguish wood species. as for the mechanical properties of wood, they are: the reaction forces of wood to any external force affecting it, bending forces, tensile forces, fracture and compressive forces, hardness strength, and cleavage strength., and the strength of cruelty]]> 2021-11-10 18:46:12 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1882167235 A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding.Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.So here are the ten physical changes that constantly occur in nature. Frost Formation. ... Dissolving. ... Freezing. ... Melting. ... Freeze-drying. ... Liquefaction Changes. ... Smoke Formation. ... Vaporization. omaramirzakaria https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1882204803 2021-11-10 19:01:45 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1882204803 we cant live without materials in our day because they can be used to make a range of different things. for example wood can be used to make table / chairs / spoons /pencils/shoes / doors floors and many more thing. Also an object can be made out of different materials used together . for example a char can be made of metal and wood and plastic . some materials maybe more suitable than others for particular uses or for manufacturing specific objects, for example metal shoes would not be very comfortable and a card board door would not be very strong . https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1882367541 2021-11-10 20:18:21 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1882367541 Iron ohisham381 https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1882402621 Iron is a chemical and metallic elements. Its symbol is (fe).Its tomic number is (26).Its one of the cheapest minerals in nature.

physical properties:
1- It is solid in room temp.
2-Its color is gray and silver.
3-It is shiny/and malleable metal.
4-melting point 1536.
5-boiling point 2861.

chemical properties:
1-It react with sulfur-sillcon.
2-It react with oxygen and (co2)forming iron rust.

]]> 2021-11-10 20:38:25 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1882402621 MAGNETIC MATERIALS AND NON MAGNETIC MATERIALS https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1882419764 Magnetic materials:
 
They are the materials which attracted to the magnet.

examples:
iron
nickel
cobalt
steal

Non magnetic materials:

They are the materials which are not attracted to the magnet.

examples:
Glass
Paper
Aluminum
Wood
plastic

name: Karma Ahmed Zaki

]]> 2021-11-10 20:48:10 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1882419764 https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1887962508 Gold is a chemical element with symbol Au and atomic number 79;[1][2][3] and thus it is one of the few elements with a high atomic number that are naturally available at the same time. It is found in nature in the form of a reddish-yellow metal, and its density is high, and it is ductile and malleable. Chemically, gold is classified as one of the transition metals and is among the elements of the eleventh group in the periodic table; It is also classified among the noble metals, as it is not affected by most common acids, except in aqua regia, which is a mixture of nitric acid and hydrochloric acid.Gold is found in its deposits in its free elemental form, sometimes in the form of pieces or granules within rocks, or in the form of veins in the ground, or in silt at the bottom of rivers. In general, gold is a relatively rare metal;[4][5] it is sometimes found in the form of a solid solution with silver metal in the electrum alloy; It also forms natural alloys with copper and palladium; In addition to forming amalgamated with mercury.Gold is found in its deposits in its free elemental form, sometimes in the form of pieces or granules within rocks, or in the form of veins in the ground, or in silt at the bottom of rivers. In general, gold is a relatively rare metal;[4][5] it is sometimes found in the form of a solid solution with silver metal in the electrum alloy; It also forms natural alloys with copper and palladium; In addition to forming amalgamated with mercury.]]> 2021-11-13 07:36:52 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1887962508 Materials Iron place:the iron place caves and mines.Copper place:copper place is caves and mines.Wood place:wood place is in trees.Cobalt place: cobalt place is caves and mines.Natural magnet place:natural magnet place is caves and mines.Cool place:cool place is caves and mines.Oil place:the place of the oil is Petroleum Reservoirs.Nikel place: the nikel place is caves and mines.Water place:the water places are lakes/rivers/oceans.Rock place:the rock place is the mountain. https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1889576436





]]> 2021-11-14 19:26:53 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1889576436 Uses of materialsEach material can be used to make a range of different things; for example, wood can be used to make tables, chairs, spoons, pencils, shoes, doors, floors and many more things. An object can be made out of different materials used together; for example, a chair can be made from metal and wood and plastic.some times materials. Is hard or soft, dull or shiny, smooth or rough, magnetic or non-magnetic https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1889717281

mazen

]]> 2021-11-14 22:35:37 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1889717281 dominant position as the most important engineering materials. Steel has been the most important over the past few centuries. But recently, and increasingly in many fields, the status of steel is being challenged by other non-metallic materials, and with the recent and wide development in materials science and engineering, which has combined metallurgy with polymer science, physical and inorganic chemistry, metallurgy, glass and ceramic technology and physics Solids, and this contributed to the design of new materials needed by modern technologies and industries, or to modifying the composition of existing materials to suit new ones, which promoted the use of non-metallic materials at the expense of traditional metal materials. Importance of Metallic Elements Non-metallic substances that can come in the form of gas, liquid or solid. It also comes in the form of natural materials such as wood, sand, clay, gases, and other elements such as carbon and others. The use of non-metallic materials instead of metallic materials is increasing day by day in most fields, due to the characteristics that distinguish them, ranging from household appliances to oil and gas pipelines. gasereslamali https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1891834295
GASSER ESLAM]]> 2021-11-15 16:56:24 UTC https://padlet.com/malekahmed292010/vyrl6p3a2ghs63hd/wish/1891834295