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3 years ago

Which of the following causes a substance to change its state of matter from a solid to a liquid?

Chemistry

2 answers:

snow_tiger [21]3 years ago

8 0

Answer:

b. a chemical reaction, in order for a substance to change its medium of state of matter it needs to go through a change in chemical balance or a chemical reaction

Explanation:

legit just learned this too

Sati [7]3 years ago

6 0

Answer:

C) Increases the pressure

Explanation:

Increasing the pressure might result in the change of temperature of the substance, which would change its state of matter.

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Lilit [14]

Answer:

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3 years ago

The second-order diffraction for a gold crystal is at an angle of 22.20o for X-rays of 154 pm. What is the spacing between the c

Alenkinab [10]

Answer: The spacing between the crystal planes is $4.07\times 10^{-10}m$

Explanation:

To calculate the spacing between the crystal planes, we use the equation given by Bragg, which is:

$n\lambda =2d\sin \theta$

where,

n = order of diffraction = 2

$\lambda$ = wavelength of the light = $154pm=1.54\times 10^{-10}m$ (Conversion factor: $1m=10^{12}pm$ )

d = spacing between the crystal planes = ?

$\theta$ = angle of diffraction = 22.20°

Putting values in above equation, we get:

$2\times 1.54\times 10^{-10}=2d\sin (22.20)\\\\d=\frac{2\times 1.54\times 10^{-10}}{2\times \sin (22.20)}\\\\d=4.07\times 10^{-10}m$

Hence, the spacing between the crystal planes is $4.07\times 10^{-10}m$

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3 years ago

What is the total charge or a boron nucleus

lesya [120]

$+5$ Charge and it is surrounded by 5 electrons.

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3 years ago

Complete the sentence. The lower the hydrogen ion concentration, the ______ the pH.

enyata [817]

The answer is higher, because the more H+ ions there are, the more acidic the solution is, and the lower the ph it will have.

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How many unpaired electrons are there in helium?

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4 years ago

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