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is water a pure substance or a mixture

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Question:okay so could you tell me whether the following are compounds or mixtures: Food Colouring Mouthwash Quartz Sulfur Cement Helium Ginger ale Sulfuric acid Iron Liquid Oxygen Carbon Dioxide crude oil glucose if you cannot answer all that is okay could you please just answers as much as possible! that would be greatly appreciated Additional stuff... and if you want to answer this part... could please say whether it is a compound or element if it is a pure substance and if it is a mixture can you say whether it is a mixture or solution! please!! for example sugar is a pure substance and is a compound scrambled eggs is a mixture so it is a mixture also is rubbing alcohol a mixture or pure substance? oh and just to help you some more... Mixture-Composed of 2 or more pure substances Solution-a homogeneous mixture of substances in which no setting occurs when it is left alone Pure Substances-Composed of only one ttype of particle-can exist in all 3 states Elements-Smallest building block of matter eg. oxygen, Hydrogen, gold Compounds-Are composed of 2 or more elements e.g water, sugar i hope this helps with your answers! and i need this for today so if anyone can please help even answer 1 or 2 that would be amazing!!!!

Answers:Food colouring - mixture (dyes dissolved in water or alcohol) Mouthwash - mixture (antiseptic dissolved in water and alcohol) Quartz - compound (silicon dioxide) Sulfur - element Cement - mixture (hydrated calcium alumio-silicates mixed with other materials) Ginger ale - mixture (carbon dioxide, sugar and flavoring dissolved in water) Sulfuric acid - compound (diHydrogen sulfate) Iron - element Liquid oxygen - element Carbon dioxide - compound Crude oil - mixture (various hydrocarbons) Glucose - compound (a carbohydrate)

Question:potassium permanganate copper chloride & sodium chloride phenolthaelin & sodium hydroxide sodium chloride & water can you please explain how you know, knowing the definitions of a mixture and substance? Thankss!!! =D

Answers:Pure substance is a combination of two or more substances in which the constituents are present in a fixed proportion. These are formed by chemical reactions and release or absorb energy during this reaction. Theses can be separated by only chemical reactions. A mixture is a combination of two or more substances in which the constituents are present in any ratio. These are formed by physical methods and no energy is absorbed or released while mixing. These can be separated by physical methods. Potassium permanganate is a pure substance. copper chloride & sodium chloride, sodium chloride & water are mixtures. I'm very sorry that I don't know about phenolthaelin & sodium hydroxide.

Question:And an explanation of the terms would be fantastic - I've gotten difference definitions at every website. Thanks in advance! Oh, and the hydrate I'm working with in a lab is Magnesium Sulfate Heptahydrate (MgSO4*7H2O) if that makes any difference.

Answers:Ignore Aurelius - he hasn't bothered to find out what a hydrate is! The water is not chemically bonded to the magnesium sulphate - no covalent or ionic bonds have to be broken to separate it, but the water is coordinated with the compound, so a hydrate is an example that is half way between a pure compound and a mixture - that's why there are differences in the websites you have searched. http://drtchemistry.wordpress.com/

Question:1. Is the ink in your marker a pure substance or a solution? Support your answer with your data. 2. Classify each of these substances as a heterogeneous mixture, homogenous mixture or a pure substance and explain how you can tell. a) Chocolate chip cookie - b) Coffee with cream - c) Aluminum foil - d) Potting soil - e) Gold metal -

Answers:1) It must NOT be a pure substance. Reasons? It has some smell, and it has color. The color is still left on whatever you marked when the smell is gone. Hence smell and color must be from two different substances. 2) a) Chocolate chip cookie - a heterogeneous mixture, since Chocolate chips are still visible b) Coffee with cream - a heterogeneous mixture, since cream itself is a heterogeneous mixture of butterfat and other components. Remember that butterfat does not dissolve in water. c) Aluminum foil - a pure substance d) Potting soil - a heterogeneous mixture e) Gold metal - a pure substance, or a homogeneous mixture, depends on the purity of gold.

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Differentiate Between Pure Substances and Mixtures :Learn how to differentiate between pure substances and mixtures