Flashcards
compound
Flashcards do conjunto (20)
- 1What is a compound?A thing that is composed of two or more separate elements; a mixture.
- 2Are the properties of compounds the same as the elements that make them upA compound has unique properties that are distinct from the properties of its elemental constituents. One familiar chemical compound is water, a liquid that is nonflammable and does not support combustion. It is composed of two elements: hydrogen, an extremely flammable gas, and oxygen, a gas that supports combustion.
- 3Name 4 common and describe themwater- clear liquid
salt- white crystalline solid
vegetable oil- thick and yellow
candle wax-soft solid
- 4How many elements is the human body made up of16
- 5What are the 6 most common elements that the human body is made up of and what is the percentage?oxygen(65%)
carbon(18%)
hydrogen(10%)
nitrogen(3%)
calcium(1.5%)
phosphorus(1%) - 6Water has a formula of h2O How many hydrogen and oxygen atoms are thereTwo hydrogen atoms and One oxygen atom
- 7What is the formula for C6H12Six carbon atoms and Twelve hydrogen atoms
- 8What is the scientific name of table salt its chemical formula and the amount of atoms found in sodium and chlorine?Sodium Chlorine (NaCl).
NaCl, consists of one atom each of sodium and chlorine. Hence, each molecule of NaCl has 2 atoms total.
- 9What is the scientific name for beach sand its chemical formula & the amount of atoms found in it?Silica (SiO2)
silica has one silica atom and two oxygen atoms
- 10What is a mixture?A substance made by mixing other substances together. A combination of different things in which the component elements are individually distinct.
- 11Describe a gaseous mixture?Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances. Salt, sugar, and many other substances dissolve in water to form homogeneous mixtures. A homogeneous mixture in which there is both a solute and solvent present is also a solution.
- 12What happens when a solid or liquid is mixed with a gas?Solids and Liquids can also be mixed into gases. When small solid particles are mixed with a gas, it is usually referred to as a smoke or dust.
- 13What are compound lattices?See Image 2 Molecules are usually found in liquids, gases and some solids. Another way that atoms can arrange themselves in a compound is as a lattice. Lattices are a system of atoms that are connected to all the atoms around them. An example of a lattice is a salt crystal.
- 14Give two examples of compound lattices?Table Salt
Beach Sand - 15What does miscible mean and give 2 examples?Liquids that mix for example water and food colouring.
- 16What does immiscible mean and give 2 examples?Liquids that do not mix for example vegetable oil and water.
- 17What are some physical properties of an element?These properties include color, density, melting point, boiling point, and thermal and electrical conductivity. While some of these properties are due chiefly to the electronic structure of the element, others are more closely related to properties of the nucleus, e.g., mass number.
- 18What are monatomic elements and how many are there?In physics and chemistry, monatomic is a combination of the words "mono" and "atomic," and means "single atom." It is usually applied to gases: a monatomic gas is one in which atoms are not bound to each other. All chemical elements will be monatomic in the gas phase at sufficiently high temperatures.
- 19What is a mist or a fog?The only difference between mist and fog is visibility. The phenomenon is called fog, if the visibility is one kilometre (1,100 yards) or less (in the UK for driving purposes the definition of fog is visibility less than 100 metres (UK Highway Code rule 226), for pilots the distance is 1 kilometre).
- 20Why are alloys important?An alloy is a mixture of two elements, one of which is a metal. Alloys often have properties that are different to the metals they contain. This makes them more useful than the pure metals alone. For example, alloys are often harder than the metal they contain.
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- FlashCards sobre compound, criado por Saara Abdulkadir em 04-05-2016.
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- Saara Abdulkadir
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