Can someone please help? This is super hard!!

What is the energy of an electromagnetic wave with a frequency of 3 x 109

vladimir2022 [97]

Answer:A

Explanation:

6 0

3 years ago

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In physical changes, the atoms or molecules that compose the matter do not change their identity, even though the matter may cha

aalyn [17]

True. Physical changes only affect the inter-molecular bonding and structure.

4 0

3 years ago

1. From the following standard electrochemical potential (and your knowledge of biomedically important metals), answer the quest

Monica [59]

Answer:

The following answer are based only on emf values

a).Most anodic element ,Titanium - Ti

b).Metal That will corrode easily is : Titanium - Ti

c). Most reactive metal is Titanium-Ti

d).Al can't be used for making implants because it undergo corrosion easily and do not form strong passive oxide layer.

Ti forms very strong passive layer which prevents further corrosion.

Au is least reactive and does not corrode.

Note : You have to give answer according to E values

In actual(without considering E values) most anodic, reactive , corrosive element is Al

Explanation:

Here the oxidation potential data is given (since elements are getting oxidised)

$\Delta^{0} E$ : Standard Reduction Potential : It is tendency of the element to gain electron and get reduced.

Oxidation Potential is opposite to reduction potential

Standard Oxidation Potential :It is tendency of the element to loose electron and get oxidised.

It is measured in Volts/V

More positive (greater)the value of the oxidation potential , stronger is the tendency of the element to get oxidised.
More negative(lesser) the value of oxidation potential lesser the tendency of the element to get oxidised. Hence the element undergo Reduction in comparison to other with more positive value .

The main application $\Delta^{0} E$ values is in electrochemical cell to predict the products of the reaction. or predict whether the reaction is spontaneous or not.

Anodic means tendency to undergo oxidation

Since $Ti\rightarrow Ti^{+}$ has maximum value of $\Delta^{0}E$ = 2.00V , so it get oxidised as compared to other elements.

Corrode , The metal which oxidise easily will also undergo corrosion easily

From the , E values Ti show maximum tendency of oxidation hence it also get corroded easily.

Ti is the most reactive because it oxidised fast as compare to other elements
Au (gold) is the least reactive element as its $\Delta^{0}E$ value is negative. So gold don't get corrode and used for making implants. Ti can also be used , since it is most reactive so it react with oxygen present in atmosphere and form a passive layer of oxide which prevent its corrosion. Al also form passive oxide but form very thin layer which is not able to protect it from corrosion

4 0

4 years ago

How much heat is required to increase the temperature of 100.0 grams of iron from 15.0oC to 40.2oC? (The specific heat of iron i

svetlana [45]

The formula you need is: heat= specific heat x mass x ΔT

specific heat= 0.46 j/g-C
mass= 100.0 grams
ΔT= 40.2 - 15.0= 25.2C

heat= (0.46) x (100.0) x (25.2)= 1159.2 joules or 1200 joules (rounded off)

6 0

3 years ago

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Is a home microwave suitable for organic synthesis ?

o-na [289]

Explanation:

The specially designed microwave units , for the synthesis , are often very expensive and at times get heated up .

The home microwave is suitable only in some case .

And , new modification done on the home microwave , increases the safety factor .

The chemical reactions which need to be done at very high pressure , are preferred to be carried in specially designed oven .

Hence ,

the home microwave is suitable only for some selected and specific reactions .

7 0

4 years ago