What is the largest layer of Earth?

If we reverse the reaction to read Z + W -> X + Y, the +deltaH would be a -delta H. Does this indicate that heat is given off

Gre4nikov [31]

Answer:

In this reaction heat is released

Explanation:

Exothemic Reactions : Those reactions in which heat is released when the products are formed .

For such reaction The enthalpy change is negative.

$\Delta H= -$ for exothermic reaction

Endothermic Reactions : Those reaction which proceed by absorbing heat . Here heat is absorbed. The enthalpy change for such reactions is positive.

$\Delta H= +$

When the direction of reaction reverses , the value of H also changes.

In the given reaction,

$X + Y\rightarrow Z +Q$

$\Delta H= +$ = heat is absorbed

So,

$Z+Q\rightarrow X+Y$

$\Delta H= -$ = heat is released

Exothermic reactions are more spontaneous as compared to endothermic ractions. This means that they proceed own their own . Only little amount of energy is supplied to exothermic reaction to produce the prodct.

5 0

3 years ago

This graph represents a population of molecules in a gas versus the distribution of the average velocity(speed) of its molecules

pshichka [43]

Answer:

Part A

Given that the graph is symmetrical and bell shaped, the average kinetic energy is given by the midline of graph, which corresponds to the common speed of the highest number of the population

Part B

The formula for the average kinetic energy, K.E. = (3/2)·(R/NA)·T

Therefore, the part of the graph that indicates the temperature of the sample is the average kinetic energy. K.E.

Part C

At a lower temperature, the heat is less evenly distributed and we have the distribution T2 higher than T1

Please see the attached graph created with MS Visio

Explanation:

3 0

2 years ago

A scientist is unsure about the accuracy of her experiment. She has checked her equipment and found it to be in good working ord

Shkiper50 [21]

Answer:

repeat the experiment

Explanation:

I am big brain. if she wants to know if it is correct, repeating the exact ay would show her if it is right or if she did something wrong

4 0

3 years ago

What number of moles of O2 will be produced by the decomposition of 4.4 moles of water?

adelina 88 [10]

2.2 moles of O2 will be produced by the decomposition of 4.4 moles of water.

7 0

3 years ago

You are balancing an ionic compound. Let's call it: AB.

rewona [7]

Answer:- $A_3B_2$

Explanations:- It is given that the charge for A is +2 and the charge for B is -3. The over all compound is neutral means the over all charge is zero. For making the over all charge zero, we need 3 positive ions and 2 negative ions. This makes a +6 charge for A and -6 charge for B and the over all charge is zero.

Also, if we think about the criss cross then charge of A becomes the subscript of B and the charge of B becomes the subscript of A.

So, the formula of the ionic compound is $A_3B_2$ . In this compound the ratio of A to B is 3:2.

The balanced equation could be shown as:

$3A+2B\rightarrow A_3B_2$

8 0

3 years ago