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Dafna11 [192]
2 years ago
12

What is the coefficient for this formula? 9 NaCl2 A. 11 B. 9 C. 2 D. 1

Chemistry
1 answer:
KATRIN_1 [288]2 years ago
5 0

Answer:

B. 9

Explanation:

The formula of the compound is given as:

            9NaCl

Coefficient is the number before the compound. The compound here is made up of sodium and chlorine.

Therefore, we have 9 as the coefficient and it is 9 moles of NaCl.

  • The compound have 1 atoms of Na
  • Also 1 atom of Cl

Note, NaCl is an ionic compound.

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which quantity will always have a negative value? A) the total bond energy of the reactants in an endothermic reaction. B) the c
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Considering the definition of enthalpy of a hemical reaction and endothermic and exothermic reaction, the correct answer is option C: the change in energy in a system during an exothermic reaction.

The enthalpy of a chemical reaction as the heat absorbed or released in a chemical reaction when it occurs at constant pressure. That is, the heat of reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction.

The enthalpy is an extensive property, that is, it depends on the amount of matter present.

On the other side, an endothermic reaction requires energy while an exothermic reaction releases energy.

In other words, a chemical reaction is endothermic when it absorbs energy from the environment. In this case, the heat is transferred from the outside to the inside of the system.

On the other hand, an exothermic reaction is one where energy flows out of the system. This energy is released in the form of heat.

So, if the enthalpy of reaction is negative, it means that during the course of the reaction, the system loses or releases heat to the environment and is exothermic, while if the enthalpy of reaction is positive, it means that during the course of the reaction, the system absorbs heat from the environment and is endothermic.

So, the correct answer is option C: the change in energy in a system during an exothermic reaction.

Learn more:

  • brainly.com/question/24266321?referrer=searchResults
  • brainly.com/question/13885179?referrer=searchResults
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Quarks are thought to be the building blocks of protons. Which was most affected by the discovery of the quark?
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34kurt

Answer:

The experimental feature of the MALDI-MS technique which allows the separation of ions formed after the adduction of tissue molecules:

B) Velocity of ions depends on the ion mass-to-charge ratio.

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  • The  option b is correct as velocity of ions depends on the ion mass-to-charge ratio because separation is done due to mass to charge ratio feature.
  • The option c is incorrect as time of travel is not inversely proportional to the ion-to-mass ratio because the ion will move across the gel until you stop the electric field.
  • The option d is not correct as electric field between MALDI plate and MS analyzer is though uniform but this feature doesn't allow the separation of ions.

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3 years ago
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Answer:

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Na₂O

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