CHEMISTRY HIGH SCHOOL

The maximum energy available for useful work from a spontaneous reaction(A) free energy
(B) lattice energy
(C) kinetic energy
(D) activation energy
(E) ionization energy

Answers

Answer 1
Answer: The answer is: A; Free Energy

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Which of the following notations is the correct noble gas configuration for Li

Answers

Noble gas configuration for Li : [He]2s¹

Further explanation

In an atom, there are levels of energy in the shell and sub-shell

This energy level is expressed in the form of electron configurations.

Lithium with atomic number 3, then the electron configuration:

1s²2s¹

And for noble gas configuration or it can be called Condensed electron configurations :

[He]2s¹

Answer:

[He]2s¹

Explanation:

In a titration, 20.0 milliliters of 0.15 M HCI(aq) is exactly neutralized by 18.0 milliliters of KOH(aq).Complete the equation in your answer booklet for the neutralization reaction by writing the formula of each product.

KOH(aq) + HCl(aq)==> ________ +________

Compare the number of moles of H+(aq) ions to the number of moles of OH-(aq) ions in the titration mixture when the HCl(aq) is exactly neutralized by the KOH(aq).

Determine the concentration of the KOH(aq).

Answers

The reaction yields H2O and KCl (remember that neutralization reactions produce water and a salt).When HCl is exactly neutralized by KOH, you are left with no excess H+ or OH- from the strong acid or strong base. Also, since both the acid and base are strong, their conjugate base and conjugate acid, respectively, have negligible basicity. Therefore, the final solution is of neutral pH and there are equal amounts of H+(aq) and OH-(aq).Since the acid is monoprotic and the base releases only 1 OH- per molecule dissociated, you need not worry about dissociation constants. In this case, you find the molarity using M1V1 = M2V2. You are finding M2, so M2 = M1V1/V2 = (0.15)(20.0)/(18.0) = 0.17M (this is considering significant figures).

The components of a longitudinal wave include __________.a. rarefaction only
b. compression only
c. compression and rarefaction
d. compression, rarefaction, and triangulation

Answers

The correct answer to the question that is stated above is letter C.compression and rarefaction

Longitudinal wave has two features which include:
A compression-- the part of the wave which is pressed together.
A rarefaction-- the part of the wave that is the most spread apart.

3. How many atoms are found in 0.000256 moles?

Answers

Answer:

1.54×10^20 atoms

Explanation:

It'sdonebyusingtherelation

N=n×Lwhere,

N=numberofentitiespresent

n=amountofsubstance (mole)

L=Avogadro'sconstantwhichis6.02×10^23

nowfromthequestion, given

n=0.000256

AndL=6.02×10^23

N=0.000256×6.02×10^23

N=1.54×10^20atoms

In the important industrial process for producing ammonia (the Haber Process), the overall reaction is:N2(g) + 3H2(g) 2NH3(g) + 100.4 kJ
A yield of NH3 of approximately 98% can be obtained at 200°C and 1,000 atmospheres of pressure.
How many grams of Ny must react to form 1.7 grams of ammonia, NH3?
0.052 g
1.49
0.00589
2.8 g

Answers

Answer:

Explanation:

Here we have to use stoichiometry.

First of all, we have to calculate the mass of 100% of yield:

1.7 g ------- 98%

X -------- 100%

X = 1.73 g (approximately)

Second, we have to calculate the mass of N2 that is necessary to react to produce the mass of 1.73g of NH3. To do that, we have to use the Molar mass of N2 and NH3 and don't forget the stoichiometric relationship between them.

Molar Mass N2 : 14x2 = 28 g/mol

Molar Mass NH3: 14 + 3 = 17 g/mol

28g (N2) ------- 17x2 (NH3)

X ------------ 1.73 g

X = 1.42 g (approximately)

A snake slithers up a giant sand dune at 2 meters per second.How far will it have moved in a minute?

Answers

it will have traveled 120 metets

Answer:

A. 120m

Explanation:

just took the test
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