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Delicious77 [7]
2 years ago
9

What is the iodine test?

Chemistry
2 answers:
gladu [14]2 years ago
6 0

Answer:

it is used to indicate the presence of starch in a solution . A positive result will indicate a blue/black solution while its absence indicates a brown color.

Explanation:

https://chem.libretexts.org/Bookshelves/Biological_Chemistry/Supplemental_Modules_(Biological_Chemistry)/Carbohydrates/Case_Studies/Starch_and_Iodine

wariber [46]2 years ago
5 0
is used to test for the presence of starch. Starch turns into an intense "blue-black" colour upon addition of aqueous solutions of the triiodide anion, due to the formation of an intermolecular charge-transfer complex. In the absence of starch, the brown color of the aqueous solution remains.
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A compound with the empirical formula ch2 has a molar mass of 70 g/mol. what is the molecular formula for this compound?
Rainbow [258]

The empirical formula, <span>C<span>H2</span></span>, has a relative molecular mass of

<span>1×<span>(12.01)</span>+2×<span>(1.01)</span>=14.04</span>

This means that the empirical formula must be multiplied by a factor to bring up its molecular weight to 70. This factor can be calculated as the ratio of the relative masses of the molecular and empirical formulas

<span><span>7014.04</span>=4.98≈5</span>

Remember that subscripts in molecular formulas must be in whole numbers, hence the rounding-off. Finally, the molecular formula is

<span><span>C<span>1×5</span></span><span>H<span>2×5</span></span>=<span>C5</span><span>H<span>10</span></span></span>

5 0
3 years ago
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Given the reaction: cu(s) + 4hno3(aq) → cu(no3)2(aq) + 2no3(g) + 2h2o(l )as the reaction occurs, what happens to copper?
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Here, Cu goes to </span>Cu(NO₃)₂ by changing its oxidation number from 0 to +2 while NO₃⁻ goes to NO₂ by reducing its oxidation state from +5 to +4 . Hence Cu is oxidized by HNO₃ in the reaction.
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2 years ago
Approximately, how many days does it take for an insect to grow from an egg to an adult?
vlabodo [156]
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2. The explosion of nitroglycerin, CHS (NO3)3 , is chemically speaking an instantaneous
frosja888 [35]

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Number for N2 is 12. Thus one mole nitroglycerin produces 3 moles N2

Explanation:

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Angelina_Jolie [31]
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