write the charactericts of elements compound &mixture
Answers
Explanation:
Molecules & Compounds
When atoms from different elements are joined together in groups, they form molecules. The atoms in molecules bind together chemically, which means that the atoms cannot be separated again by physical means, such as filtration. The molecule has different properties from the elements from which is was made. A water molecule is not three separate atoms, two hydrogen (H) and one oxygen (O), but it is actually a unique H2O molecule.
Like elements that are formed of atoms of the same sort, compounds are formed of molecules of the same sort. The elements can be combined into about 2 million different compounds! Did you know that eggshells are made up of a calcium carbonate compound? And citric acid, which is found in oranges and other citrus fruit, is a compound of carbon, hydrogen, and oxygen atoms. Your kids might find it helpful to do a science research project finding other common compounds around your house. Make hypotheses and do research using a chemistry reference book, web site, or text book to find out the answers.
There are more carbon compounds than compounds of any other element. Organic compound is the name for the carbon compounds found in all living things.
Mixtures – A Bit of This and That
All matter can be classified into two categories: pure substances and mixtures. A pure substance consists of a single element or compound. Iron is formed only of iron (Fe) atoms; table salt is formed only by sodium chloride (NaCl) molecules. A mixture, however, is made up of different compounds and/or elements. When salt is added to water to make saltwater, it becomes a mixture. The salt and water molecules do not combine to form new molecules, but only “mix” together while still retaining their identities. Air is also a mixture, containing just the right amounts of nitrogen, oxygen, and other gases for life on Earth.
Not all mixtures have the same composition throughout. Salt water does, but Italian salad dressing does not—the parts separate and are not perfectly blended or homogenous. Mixtures of metals are called alloys (bronze is an alloy of copper and tin); liquid mixtures (such as saltwater) are solutions.
The substances that make up a mixture can be separated by physical means because they have different physical properties (such as different melting points) and are not chemically bonded. A mixture can be separated into its parts in a variety of ways, including decantation (letting the sand in a mixture of water and sand settle, and then draining off the water, for example), filtering, and evaporation. You can use a kitchen funnel and coffee filter for filtration, and either use sunlight or low heat for evaporation. Try out these methods on a saltwater and a sand and water mixture to see how they work and compare the results. Evaporation will work for both saltwater and sand and water solutions, but filtration will not work for saltwater. Can you think of other examples where a separating method will work for one mixture and not another? Another one to try is lemon juice, a mixture of water and citric acid; what do you think happens when it is boiled? The water evaporates and eventually leaves nothing but citric acid crystals
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Explanation:
Characteristics of elements :-
1) Elements are made of only one type of atom.
2) They have their unique properties.
3) Example : Oxygen ( it's molecules are made of two Oxygen atoms.)
4) Elements have a fixed boiling and melting point.
Characteristics of compounds :-
1) Compounds are uniform mixtures of two or more elements.
2) The constituents (elements) in a compound do not retain their unique properties.
3) Example : Water ( it's molecules are made of on Oxygen atom and two Hydrogen atoms.)
4) Compounds have a fixed boiling and melting point.
Characteristics of mixtures :-
1) Mixtures are not uniform mixtures of two or more elements.
2) The constituents retain their unique properties.
3) Examples :- Tea
4) Mixtures do not have a fixed melting and boiling point.
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