Hi There! :)

Which elements in the periodic table are metalloids or have semimetallic properties?

Boron, Silicon, Germanium, Arsenic, Antimony, and Polonium are all metalloids. Some people consider Astatine a metalloid

8 0

4 years ago

Describe how oxides of nitrogen are produced when petrol is burned in car engines !!HELP!!

KIM [24]

Answer:

Answer is on the pic

Explanation:

I hope it's helpful!

8 0

3 years ago

Calculate the standard potential, e°, for this reaction from its equilibrium constant at 298 k. 6.47 x 10^5

Elina [12.6K]

The working equation for this is written below:

E° = 0.0592logK/n

So, we have to know the value of n first which represents the number of moles electron in the reaction. We cannot answer this because we are not given with the reaction. However, just suppose the reaction is:

Cu⁺ + 2e⁻ --> Cu

Then, n=2. Continuing,

E° = 0.0592log(6.47×10⁵)/2 = 0.172 V

4 0

3 years ago

When warmed in dilute sulfuric acid, 1-phenyl-1,2-propanediol undergoes dehydration and rearrangement to give 2-phenylpropanal.

juin [17]

The mechanism is as suggested

1) Protonation of alcohol

2) removal of water molecule to give carbocation

3) hydride shift to give more stable carbocation [rearrangement]

4) the stability of carbocation due to resonance

5) removal of proton and formation 1-phenyl-1-propanone.

This is Pinacole pinacolone rearrangement

Thus the reaction can be depicted as

3 0

3 years ago