3 years ago

Which of the following is not a chemical change?

Chemistry

1 answer:

MaRussiya [10]3 years ago

3 0

Answer:

May be boiling is the answer because all other options are a proper chemical changes.

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What is Ammeter & voltmeter

Inga [223]

Answer:

Ammeter is a device to calculate electricity current and volt meter is a device to measure voltage.

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2 years ago

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If a laser light is compose of photons each with an energy of 4.58 × 10−19 J, what is the photon energy of this light in units o

kap26 [50]

Answer : The photon energy of this light in units of nanometers, (nm) is, $4.34\times 10^{-2}nm$

Solution :

Formula used :

$E=\frac{h\times c}{\lambda}$

where,

E = energy of photon = $4.58\times 10^{-19}J$

h = Planck's constant = $6.626\times 10^{-34}Js$

c = speed of light = $3\times 10^8m/s$

$\lambda$ = wavelength = ?

Now put all the given values in the above formula, we get:

$4.58\times 10^{-19}J=\frac{(6.626\times 10^{-34}Js)\times (3\times 10^8m/s)}{\lambda}$

$\lambda=4.3017\times 10^{-7}m=434.017\times 10^{-9}m=434.017nm=4.34\times 10^{-2}nm$

conversion used : $(1nm=1\times 10^{-9}m)$

Therefore, the photon energy of this light in units of nanometers, (nm) is, $4.34\times 10^{-2}nm$

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3 years ago

The following substituents are listed in random order. Using the Cahn–Ingold–Prelog convention, rank the groups below from highe

Ivahew [28]

Answer:

-SH, -CH2SH, - CH2CH2SH, -H,

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3 years ago

When an electron in an atom jumps from a high-energy orbital to a lower-energy one, what happens??

Burka [1]

All the energy gets released i think

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4 years ago

2. Iron has a density of 7.86 g/cm). A sample of an unknown metal is measured and found to be

alekssr [168]

The volume of sample = 2.25(1.5)(2.25) = 7.59375 cm3
Density = mass / volume
Density = 55.75 / 7.59375 = 7.34156 g/cm3

As the density of iron is 7.86 g/cm3 instead, it is not iron

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3 years ago