What type of reaction is shown below? A. hydration reaction B.addition reaction

Which element has the greatest density at stp? calcium, chlorine, carbon or copper?

ludmilkaskok [199]

Density = mass/volume

Since at STP, one mole of any gas occupies 22.4 liters, therefore, the volume is equal.
So, we will arrange based on mass.

From the periodic table:
mass of carbon = 12 grams
mass of calcium = 40 grams
mass of chlorine = 35.5 grams
mass of copper = 63.5 grams

Based on this:
copper has the highest density.

8 0

3 years ago

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7. A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 250 torr . Pure

Sliva [168]

Answer:

mole fraction hexane 0.64

Explanation:

We know from Raoult's law of partial pressures that for a binary mixture, the vapor pressure above solution is the sum of the partial pressures of each gas:

P total = P(A) + P(B)

Also the partial pressure of a component is the product of its mole fraction , X, times its pure vapor pressure:

Ptotal = X (A)Pº(A) + X (B)Pº(B)

Since for solution of two components the mole fractions add to one, we now have all the information required to compute the answer.

250 torr = X(hexane)151 torr + ( 1 - X(hexane) )425 torr

250 = 151X(hexane) + 425 - 425 X(hexane)

274 X(hexane) = 175

X(hexane) = 1 -0.6 = 0.64

8 0

3 years ago

Given a balanced chemical equation it is always possible to determine

Alborosie

Answer:

C) the relative number of moles taking part in the reaction

Explanation:

From a balanced chemical equation, it is always possible to determine the relative number of moles taking part in a chemical reaction.

The number of moles is the amount of the reacting specie that makes up a chemical reaction.

In balanced chemical equation, the number of moles of reactants and products must be the same.
From this understanding, we can determine the amount of reactants and products needed for a chemical reaction to take place.

8 0

3 years ago

¿que fuerza de debera aplicar en un embolo pequeño de una prensa hidraulica de 12cm2 de area ,para levantar un cuerpo de 70000N

n200080 [17]

Answer: un flechazo fácil

Explanation:

7 0

3 years ago

Determine whether each of these reactions occur through an S N 1 , S N 2 , E1, or E2 mechanism. A. A tertiary alkyl halide is tr

Elan Coil [88]

Answer:

See explanation below

Explanation:

First to all, we need to remember the difference between Sn and E reactions.

Reactions where a Sn1 or Sn2 occur, it's where you have a reactant with a very good leaving group and a nucleophyle, and the product or products of the reaction always results that the nucleophyle is now taking the place where the leaving group of the innitial reactant was. This can be done in acid medium (SN1 carbocation intermediate 2 steps) or basic medium (SN2 fast reaction 1 step)

Reactions where a E1 or E2 occur, we also have a reactant with a very good leaving group and a nucleophyle, and the product of reaction always result in the fact that not only the leaving group is out of the innitial reactant but also an electrophyle from the reactant is no longer there, and the product form a new pi bond (a double bond or triple bond) and the nucleophile gets the electrophyle that leaves the molecule. Depending of the conditions it can be either E1 or E2 (same conditions as Sn1 and Sn2).

According to this very brief explanation, let's see what we have in the options:

A. Tertiary alkyl halide with ethanol, heating and the product is an alkene.

According to the explanation, we have a tertiary alkyl halide (a carbon with all of it's bond different than hydrogen), reacting with ethanol and heating. The product formed was an alkene. In this case, the halide leaves the molecule forming a carbocation intermediate and the ethanol just react with an electrophyle of the bromide alkyl, in this case, an atom of hydrogen, and then the lone pairs form a double bond giving the alkene. Because of the carbocation intermediate this is a E1 reaction.

B. Tertiary alkyl halide treated with potassium terbutoxide in tert butanol and give an alkene.

This is similar as case A, the difference is that we are doing this in basic medium, therefore, the mechanism involved is either E2 or Sn2. However, the final product is also an alkene, which means that the tert-butoxide substract the electrophyle of the alkyl halide, the lone pairs goes down to the molecule promoving the leaving of the halide to form the alkene. This then, would be an E2 mechanism reaction.

C. is the same as case A so it's a E1 reaction.

3 0

3 years ago

What type of reaction is shown below?A. hydration reaction B.addition reaction​

What type of reaction is shown below?A. hydration reaction B.addition reaction