Hey, please could someone answer this?

Hello guys what is good! What are all the elements of the P block?

Ghella [55]

boron, carbon, nitrogen, oxygen and flourine families in addition to the noble gases.

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also to answer the 'hello guys what is good!':nothin u?

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6 0

2 years ago

Which of the following is a testable hypothesis?

Sonja [21]

The answer would be B because you can go and find evidence and facts to conduct an investigation on that.

6 0

3 years ago

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How many molecules are present in 187 grams of XeF4

PtichkaEL [24]

There are 5.43 x 10²³ present in 187 grams of XeF₄

<h3>Further explanation </h3>

The mole is the number of particles(molecules, atoms, ions) contained in a substance

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

$\tt n(mol)=\dfrac{mass(m)}{MW}$

mass of XeF₄ = 187 g

mol XeF₄ (MW=207,2836 g/mol) :

$\tt mol=\dfrac{187}{207,2836 g/mol}=0.902$

Number of molecules :

$\tt N=0.902\times 6.02\times 10^{23}\\\\N=5.43\times 10^{23}$

4 0

3 years ago

Write a mechanism for the formation of triphenylmethanol from the reaction of phenylmagnesium bromide and diethyl carbonate..

My name is Ann [436]

The reaction proceeds through nucleophilic acyl substitution reaction.

Phenyl magnesium bromide substitutes one ethoxide ion in the nucleophilic acyl substitution reaction that drives the process forward. A subsequent equivalent of phenyl magnesium bromide produces triphenyl methanol through a nucleophilic addition reaction with the resultant keto group.

There are two ethoxy leaving groups in diethyl carbonate. Tertiary alcohol is created when diethyl carbonate combines with too much Grignard reagent. The Grignard reagent attacks the carbonyl carbon three times in the mechanism to produce the tertiary alcohol.

The mechanism is shown below:

Learn more about Grignard reagent here:

brainly.com/question/14702056

#SPJ4

5 0

2 years ago

after a fire, the ashes have less mass and take up less space than the trees and vegataion before the fire. how can this be expl

stira [4]

Fire expends ENERGY which is a by-product of conversion of matter.

The calories or therms of a fire equal a certain amount of mass. 

When MATTER (Electron) and ANTI-MATTER (Positron) collide they don't inhillate each other with nothingness, they always realse TWO gamma particles. 

The ENERGY of the TWO gamma particles CONSERVES the MASS of the ELECTRON and The POSITRON 

This is what Einstein meant by E=mc2 

ENERGY has physical properties than can be measured. 

These properties equal the mass that no longer exists after you measure the mass BEFORE and AFTER 

The AFTER MASS + the ENERGY MUST equal the BEFORE MASS to at least 99.999% 

You must take heat, light and other PARTICLES into consideration. 

Their MASS plus their ENERGY

4 0

3 years ago

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