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steposvetlana [31]
3 years ago
8

What reagent is used to test for starch​

Chemistry
1 answer:
Elodia [21]3 years ago
8 0

Answer:

iodine

Explanation:

In the presence of starch, iodine turns a blue/black colour. It is possible to distinguish starch from glucose (and other carbohydrates) using this iodine solution test. For example, if iodine is added to a peeled potato then it will turn black. Benedict's reagent can be used to test for glucose.

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Describe the term molarity as it relates to an acid or base.
algol13
It's essentially another word for concentration, of the acid. e.g.  "the molarity of the acid is 3moldm^-3"
8 0
3 years ago
Read 2 more answers
2 A(g) + B(g) ---> 2 C(g)Rate = k [A][B]At the beginning of one trial of this reaction, [A] = 3.0 M and [B] = 1.0 M. The obse
Orlov [11]

Answer:

Lmol⁻¹s⁻¹

Explanation:

The rate law of the given reaction is:-

Rate=k[A][B]

Wherem, k is the rate constant.

Given that:-

Rate = 0.36 mol/Lsec = 0.36 M/sec

[A] = 3.0 M

[B] = 1.0 M

Thus,

Applying in the equation as:-

0.36 M/sec =k × 3.0 M× 1.0 M

k = 0.12 (Ms)⁻¹ = 0.12 Lmol⁻¹s⁻¹

<u>The units of k = Lmol⁻¹s⁻¹</u>

6 0
3 years ago
H2 + NO → H2O + N2<br><br><br> If 180.5 grams of N2 are produced, how many grams of H2 were reacted?
Lena [83]

Answer:

12.89 moles

Explanation:

Before we solve the question, we have to balance the equation of the reaction first. The balanced reaction will be:

2 NO + 2 H2→ N2 + 2 H2O

There are 180.5g of N2 produced, the number of produced in moles will be: 180.5g / (28g/mol)= 6.446 moles

The coefficient of H2 is two and the coefficient of N2 is one. Mean that we need two moles of H2 for every one mole of N2 produced. The number of H2 reacted will be: 2/1 * 6.446 moles = 12.89 moles

6 0
3 years ago
Find the value of the solubility product ksp for a saturated solution of mercury bromide, hgbr2, using the solubility of mercury
kondaur [170]
When the reaction equation is:

HgBr2(s) ↔ Hg2+(aq)   +   2Br-(aq)

So Ksp expression = [Hg2+] [Br-]^2

assume the solubility S = X = 2.66 x 10^-7 M 

and from the reaction equation :

we can see that [Hg2+] = X

and the [Br-] = 2 X

so by substitution in Ksp formula will can get the Ksp value:

∴ Ksp = X * (2X)^2

       = 2.66 x 10^-7 * (2*2.66 x 10^-7)^2

       = 7.53 x 10^-20
7 0
3 years ago
Which is an electron deficient molecule
ale4655 [162]
Molecules which are deficient or poor of electrons are called electron deficient molecules. 

Hope this helps!
6 0
3 years ago
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