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3 years ago

B) An element whose particles are molecules.

Chemistry

1 answer:

igor_vitrenko [27]3 years ago

3 0

Answer:

B. An element whose particles are molecules.

Explanation:

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When the enthalpy of the reaction is provided, it is always in the context of moles; i.e., ΔHrxn=+252.8 kJ when two moles of CH3

Morgarella [4.7K]

Answer: The balanced chemical equation is written below.

Explanation:

There are 2 types of chemical reaction classified on the basis of heat change:

Endothermic reactions : They are the reactions in which energy of products is more than the energy of the reactants. For these reactions, energy is absorbed by the system. The $\Delta H$ comes out to be positive and is written on the reactants side.
Exothermic reactions: They are the reactions in which energy of reactants is more than the energy of the products. For these reactions, energy is released by the system. The $\Delta H$ comes out to be negative and is written on the product side.

We are given:

Moles of methanol = 2 moles

Moles of methane = 2 moles

Moles of oxygen gas = 1 mole

$\Delta H_{rxn}=+252.8kJ$

The chemical equation follows:

$2CH_3OH+252.8kJ\rightarrow 2CH_4+O_2$

Hence, the balanced chemical equation is written above.

4 0

3 years ago

Which ligand binds the tightest? Ligand A, with a Kd of 10^-9M Ligand B, with a Kd of 10^-3M Ligand C, with a percent occupancy

padilas [110]

To answer this item, we must take note that the ligand that binds the tightest is the one with the lowest dissociation constant, Kd. Kd's for both A and B are already given so, we only need to solve Kds for C and D.
Kd of C
0.3 = (1x10⁻⁶)/(1x10⁻⁶ + Kd) ; Kd = 2.3x10⁻⁶
Kd of D
0.8 = (1x10⁻⁹)/(1x10⁻⁹ + Kd) ; Kd = 2.5x10⁻10
Since Ligand D has the least value of dissociation constant then, it can be concluded that it binds the tightest.

6 0

3 years ago

Check all of the boxes that are true about the proton:

vovikov84 [41]

Answer:

it is outside the nucleus F

it has a positive charge T

it has no mass F

it has a negative charge F

it is inside the nucleus ...it is part OF the nucleus.

it is the same as the atomic number T

it is the same as the number of neutrons F

75% of the isotopes have a mass ima just guess cuz i dunno about this one...i think it matters on the atom element.

Explanation:

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3 years ago

A new chemist moved into an industrial lab where work was being done on oxygenated gasoline additives. Among the additives that

marusya05 [52]

solution:

The given specta of the unknow compound of the additive gasoline in the pure state are determined from the given spectral data is

$\delta 0.9 triplet Area=3H\\\delta 1.5 sextet area=2H\\\delta 3.2 triplet,area =1H\\\delta 3.5 quartert,area=2H\\form the above spectral data the structure of the compound is\\(3.5,q)(3.2,t)\\$ $CH_{3}---CH_{2}---CH_{2}---OH\\As the compound is very sample so there is interaction between the alcoholic proton and methylene proton.$

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3 years ago

Na Sa Bant HCL -> 50g Hao pt Soy

kakasveta [241]

North America and south africa

8 0

3 years ago

B) An element whose particles are molecules.​

B) An element whose particles are molecules.