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4 years ago

What material is least likely to be recognized as a mixture by looking under a microscope

Chemistry

1 answer:

I am Lyosha [343]4 years ago

6 0

A homogenous mixture is uniform and thus hard to recognize as a mixture. An example is water.

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Be sure to answer all parts. identify a, b, and c, intermediates in the synthesis of the five-membered ring called an α−methylen

Vanyuwa [196]

The complete reaction along with intermediates is given below, with each step highlighted in different color.

Step 1:
In this step an acidic proton at alpha position is abstracted from lactone moiety and corresponding enolate is formed, which is resonance stabilized. Both structures are shown. In this case LDA (Lithium diisopropylamide) acts as a base.

Step 2:
The enolate formed attacks on Methyl Iodide, as Iodide being greater in size is a good leaving group and alpha methyl moiety is generated.

Step 3:
This step is acid catalyzed Bromination. Bromine is added at alpha position.

Step 4:
This is elimination reaction and is according to Hofmann's Rule. Here less substituted alkene is generated.

7 0

4 years ago

How much faster does helium escape through a porous container than ozone?

otez555 [7]

According to Graham's Law ," the rates of effusion or diffusion of two gases are inversely proportional to the square root of their molecular masses at given pressure and temperature".

r₁ / r₂ =   $\sqrt{M2 / M1}$ ---- (1)

r₁ = Rate of effusion of He

r₂ = Rate of Effusion of O₃

M₁ = Molecular Mass of He = 4 g/mol

M₂ = Molecular Mass of O₃ = 48 g/mol

Putting values in eq. 1,

r₁ / r₂ =   $\sqrt{48 / 4}$

r₁ / r₂ =   $\sqrt{12}$

r₁ / r₂ = 3.46

Result:
Therefore, Helium will effuse 3.46 times more faster than Ozone.

4 0

3 years ago

A solution is made by dissolving 25.20 g of aluminum acetate in 185.0 mL of water. What is the concentration of acetate ions?

Andreas93 [3]

To answer this question, you need to know the aluminum acetate weight and formula. Molecular weight of aluminum acetate is 204.11g/mol, so the concentration should be: (25.20/204.11 )/(0.185l) = 0.1234 mol/0.185l= 0.6673 M

The aluminum acetate Al(C2H3O2)3 which mean for one aluminum acetate there will be 3 acetate ion. The concentration of acetate should be: 0.6673 M= 2M

4 0

3 years ago

Convert the boiling temperature of liquid ammonia, -28.1 degree fahrenheit, into degrees celsius and kelvin.

vova2212 [387]

Answer:

°C = -33.39 °C

K = 239.76 K

Explanation:

°C = ( °F -32 ) / 1.8
K = 273.15 + °C

⇒ °C = ( -28.1 - 32 ) / 1.8

⇒ °C = - 33.39 °C

⇒ K = 273,15 + (-33.39)

⇒ K = 239.76 K

6 0

4 years ago

Write the net ionic equation for the reaction of aqueous solutions of silver nitrate and lithium bromide. (Include states-of-mat

enot [183]

Answer:

Ag⁺ (aq) + Br⁻ (aq) ⇒ AgBr (s)

Explanation:

The reaction between silver nitrate and lithium bromide is as follows:

AgNO₃ (aq) + LiBr (aq)⇒ AgBr (s) + LiNO₃ (aq)

The aqueous compounds will dissociate into their ions, so the reaction may be rewritten as:

Ag⁺ (aq) + NO₃⁻ (aq) + Li⁺ (aq) + Br⁻ (aq) ⇒ AgBr (s) + Li⁺ (aq) + NO₃⁻ (aq)

In order to form the net ionic equation, we remove from the reaction any ions that did not undergo a chemical change (ions that are exactly the same on the reactants side and on the products side). These ions are referred to as spectator ions. The spectator ions are NO₃⁻, Li⁺, and Br⁻. The net ionic equation is then:

Ag⁺ (aq) + Br⁻ (aq) ⇒ AgBr (s)

3 0

3 years ago