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When iodine solution is mixed with an unknown sample of food the mixture turn blue black this color change indicates the presence of?
Wiki User
∙ 12y ago
An enzyme.
Wiki User
∙ 12y ago
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How do you test for halide ions?
If you wish to test for the presence of halogen in an iodoform, then you must first inject the iodoform with a touch of helium. This helium will make the halogen react and change colors, making it notable in the iodoform.
If solid material settles out of a mixture over time the unknown mixture is likely a?
suspension
Is gravel a pure substance or a mixture?
Geavel is not pure, it is an undescriptable mixture of unknown composition
What is the purpose of adding an indicator to an unknown solution?
Indicators contain chemicals that will react with certain substances. If that substance is present in your unknown solution, a reaction will occur. If no reaction occurs, then that substance is not present in your solution
How can you identify Sulphate anions in a unknown solution?
Dip a copper coin in that unknown solution And make that solution slightly acidic. After about one hour, take out the copper coin and if there are green colours deposits then there is sulphate, otherwise not.
When biuret reagent is added to an unknown colorless solution the solution turns light purple. this indicates the presence of which molecules?
process that release energy by breaking down food molecules in the presence of oxygen
How can I find out whether a unknown mixture has protein in it?
The most common method is the biuret test: in the presence of a copper(II) solution and NaOH the sample become violet.
What does a positive Molisch's test on an unknown substance indicate?
A positive Molisch's test result indicates the presence of carbohydrates.
Is sodium hydroxide unknown solution?
Sodium hydroxide is not an unknown solution.
How do you test for halide ions?
If you wish to test for the presence of halogen in an iodoform, then you must first inject the iodoform with a touch of helium. This helium will make the halogen react and change colors, making it notable in the iodoform.
Which describes mendeleevs use of the term ekaaluminum?
A mixture of aluminum and an unknown element.
Is iron sulphide a compound or a mixture?
unknown
If solid material settles out of a mixture over time the unknown mixture is likely a?
suspension
Is gravel a pure substance or a mixture?
Geavel is not pure, it is an undescriptable mixture of unknown composition
If the flask were not thoroughly wiped dry how would this affect the molar mass?
The presence of water or cleaning solution will dilute or taint whatever is put inside. This change will affect the overall chemical property of the solution, causing a false mass and volume reading.
How can you test for the presence of ethanol?
Identification of the components of unknown mixture is a tricky business. Your best bet is to begin with fractional distillation. Using a typical claisen head and condenser set-up, measure the vapor temperature of all the fractions that are distilled from your mixture. The most volatile components will come off first, followed by the heavier and more polar components. Then you can emploly typical charecterization methods, such as IR, NMR, and GC/MS on those fractions to determine their identities. It may be that you have an azeotropic mixture, in which case you're in a much larger pickle.
What do you use to solve for the unknown variable?
Equations are used to find the solution to the unknown variable.
