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4 years ago

Which statement is true about crystal lattice energy?

Physics

2 answers:

irinina [24]4 years ago

3 0

The answer is:

It is a measure of the strength of the bonds between ions.

Lattice energy is an estimate of the strength of the bonds formed by ionic compounds.

The first two choices are wrong because it is actually the opposite.

As the ion size increases, lattice energy <u>decreases</u>.

As charge of ions increases, lattice energy <u>increases</u>

As for the other third option, it is wrong because lattice energy is the energy RELEASED not absorbed.

BabaBlast [244]4 years ago

3 0

Answer: The correct option is:

It is a measure of the strength of the bonds between ions.

Explanation:

Lattice energy is defined as amount of energy released on the formation of one mole of crystalline solid from gaseous ions.It is also defined as energy required to break the 1 mole of crystalline solid into its constituting ions in gaseous state that is strength between the ions.

It depends upon two factors:

With increase in charge on the ion the lattice energy increases.
With increase in the size of the ions the lattice energy decreases.

So, from the given options the correct statement is:

It is a measure of the strength of the bonds between ions.

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a disc starts from rest with an angular acceleration completes 10 revolutions in 2 seconds. the time taken by it to complete 10

umka2103 [35]

Starting from rest, the disc completes $\theta$ revolutions after $t$ seconds according to

$\theta=\dfrac\alpha2t^2$

with angular acceleration $\alpha$ . It completes 10 rev in 2 s, which means

$10\,\mathrm{rev}=\dfrac\alpha2(2\,\mathrm s)^2\implies\alpha=5\dfrac{\rm rev}{\mathrm s^2}$

Find the time it takes to complete 20 rev with this acceleration:

$20\,\mathrm{rev}=\dfrac12\left(5\dfrac{\rm rev}{\mathrm s^2}\right)t^2\implies t=\sqrt8\,\mathrm s\approx2.83\,\mathrm s$

so it takes approximately 0.83 s to complete 10 more rev.

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4 years ago

Two large, parallel, conducting plates are 12 cm apart and have charges of equal magnitude and opposite sign on their facing sur

ValentinkaMS [17]

Answer:

a) 2.4×10^4N/C

b) 2.9 ×10^3V

Explanation:

Correct ststement: An electric force of 3.9×10^-15N acts on the electron if it is placed anywhere between the two plates.

a) The electric field magnitude is given by E= F/e

Where F = electric force

e= elementary charge carried by a single proton e= 1.6×10^-19C

E= (3.9×10^-15)/(1.6×10^-19)

E= 2.4×10^4NC

b) Ptential difference is given by:

Change in V= E×change in distance

Potential difference= (2.4×10^4)× (0.12)

Potential difgerence= 2.9×10^3V

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3 years ago

Name two elements that have similar properties. How can you tell using the periodic table?

tangare [24]

Helium and nitrogen because they are both from the noble gas group.

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4 years ago

Explain how sound is produced by school bell

s344n2d4d5 [400]

Answer:

vibration

Explanation:

When the school bell vibrates, it forces the adjacent particles in air to vibrate. ... As the bell continues to move forward and backward, it produces a series of compressions and rarefactions. This makes the sound of a bell propagate through air.

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3 years ago

Find the distance traveled in one back-and-forth swing by the weight of a 12 in. Pendulum that swings through a 75 degree angle.

tia_tia [17]

The distance traveled by pendulum, in one back-and-forth swing is 75.75 inches.

The period of pendulum can be calculated by

$T = 2\pi \sqrt {\dfrac Lg}$