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3 years ago

Given the noble gas configuration of an element: [Ar] 4s2, 3d5, what is the element?

Chemistry

1 answer:

monitta3 years ago

6 0

Question

<em>Given the noble gas configuration of an element: [Ar] 4s2, 3d5, what is the element? </em>

Answer:

<em>B.) Argon</em>

Hope this helps!

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Read 2 more answers

which quantity will always have a negative value? A) the total bond energy of the reactants in an endothermic reaction. B) the c

lara [203]

Considering the definition of enthalpy of a chemical 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.

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 about enthalpy of a chemical reaction and endothermic and exothermic reaction:

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2 years ago

Compare (a) the number of drops and (b) the length of time, in minutes, required to deliver 50 mL of intravenous solutions when

Marina CMI [18]

Explanation:

Volume of intravenous solution to be delivered = 50 mL

1) Rate of drops per milliliter of the solution = r = 60 drops/mL

Number of drops delivered :

$60 drops/mL\times 50 mL = 3000 drops$

Time required to deliver 3000 drops = t

Rate of drop solution with respect to time = R = 1 drop/second

$\frac{3000 drop}{t}=1 drop/s$

t = 3000 seconds = 50 minutes (1 min = 60 seconds)

Number of drops delivered 3000.

50 minutes are required to deliver 50 mL of intravenous solutions.

2) Rate of drops per milliliter of the solution = r = 15 drops/mL

Number of drops delivered :

$15 drops/mL\times 50 mL = 750 drops$

Time required to deliver 750 drops = t

Rate of drop solution with respect to time = R = 1 drop/second

$\frac{750 drop}{t}=1 drop/s$

t = 750 seconds = 12.5 minutes (1 min = 60 seconds)

Number of drops delivered 750 .

12.5 minutes are required to deliver 50 mL of intravenous solutions.

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3 years ago