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Chemistry

2 answers:

oksian1 [2.3K]3 years ago

8 0

Explanation :

An x-ray technician will place a lead cloth over parts of your body when taking an x-ray to protect your cells from being damaged. This is due to the reason that x-rays have the potential to harm our body.

X-rays have shorter wavelength while radio waves have a longer wavelength. Also, the frequency of x-rays are more and the radio wave is less.

Since energy is directly proportional to frequency, so x-rays carry more energy which transferred to our body.

When the human body is directly exposed under x -rays, the electrons of x-rays strikes and due to this our DNA chains can break. This can leads to cancer.

Sergeu [11.5K]3 years ago

6 0

Radio waves can harm people, but due to the wavelength of the X-Rays which are extremely dangerous to humans, and the wavelength of Radio waves (which are calm compared to the way X-Rays look) compared side by side, it would take extensive exposure to the Radio waves to cause disease, cancer, or even death. Hope I helped!

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What is the energy change if 84.0 g of calcium oxide (CaO) reacts with excess water in the following reaction?

pochemuha

The energy change if 84.0 g of CaO react with excess water is 98KJ of heat is released.

calculation
heat = number of moles x delta H

delta H = - 65.2 Kj/mol

first find the number of moles of CaO reacted

moles = mass/molar mass
the molar mass of CaO = 40 + 16= 56 g/mol
mass = 84 g
moles therefore = 84 g/56 g/mol =1.5 moles

Heat is therefore = 1.5 moles x -65.2 = - 97.8 Kj = -98 Kj

since sign is negative the energy is released

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3 years ago

T/F___ At the eutectic composition, an alloy can solidify at a constant temperature.___ For effective dispersion strengthening,

azamat

Answer:

TRUE
FALSE
TRUE
FALSE
FALSE
TRUE

Explanation:

At the eutectic composition, an alloy can solidify at a constant temperature : TRUE . this is because at eutectic composition the type of reaction that takes place there is invariant reaction in its thermal equilibrium
For effective dispersion strengthening, the dispersed phase should be needle-like, as opposed to round : FALSE. because the rounded shape will not cause a crack.
Intermetallic compounds are usually hard and brittle : TRUE. because Intermetallic compounds prevents dislocation movements and this makes them brittle and hard
For the effective dispersion and strengthening, the dispersed phase should be continuous : FALSE. this is because the dispersed precipitate must be small and not continuous
Stoichiometric intermetallic compounds exist over a range of compositions : FALSE
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3 years ago

As the water velocity decreases, the size of the particles that the water can transport increases. True or false

tiny-mole [99]

The answer is False.

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3 years ago

Take a cup of water, add sugar, and stir. if the resulting solution contains sugar crystals that do not dissolve, the solution i

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Since there is no heating being done, the water is just saturated.

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3 years ago

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UkoKoshka [18]

Answer:

Hydrogen ions

Explanation: acids will produce hydrogen ions, I asked my teacher. Please tell me if we are wrong.

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3 years ago

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