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4 years ago

Need to know the process.

Chemistry

1 answer:

erastova [34]4 years ago

7 0

To calculate ΔH of reaction, let's use the following formula

ΔH of reaction= [ΔH of products] - [ΔH of reactants]

note: keep in mind that you have to multiply each value by its coefficient.

ΔH of reaction= [ ΔH CO2 + ΔH H2O + ΔH Na2CO3] - [ΔH NaHCO3]

ΔH of reaction = [ -393.5 + -241.8 + -1130.9] - [ 2 x -947.7]

ΔH of reaction= 129.2 kJ
since ΔH is positive, the reaction is endothermic

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Covalent bonds in a molecule absorb radiation in the IR region and vibrate at characteristic frequencies.

vazorg [7]

Answer:

$Frequency=1.6\times 10^{12}\ Hz$

Explanation:

The relation between frequency and wavelength is shown below as:

$c=frequency\times Wavelength
$

c is the speed of light having value $3\times 10^8\ m/s$

Given, Wavelength = 188 μm

Also, 1 μm = $10^{-6}$ nm

So,

Wavelength = $188\times 10^{-6}$ m

Thus, Frequency is:

$Frequency=\frac{c}{Wavelength}$

$Frequency=\frac{3\times 10^8}{188\times 10^{-6}}\ Hz$

$Frequency=1.6\times 10^{12}\ Hz$

7 0

4 years ago

How many calories of heat are necessary to raise the temperature of 378.2 g of water from 32.2 oC to the boiling point?

ivolga24 [154]

Answer: multiple apply them together then divide them

Explanation:

8 0

3 years ago

If an element is lustrous, brittle, and a semi-conductor, how would you classify it?

just olya [345]

Metalloid

Explanation:

If an element is lustrous, brittle and a semi-conductor, it is best classified as a metalloid.

Metalloids shares attributes of metals and non-metals.

They are often described as semi-metals as they do not share the full properties that makes a metal a metal.
Metalloids are lustrous but not malleable like metals.
They do not conduct electricity but they do so on certain conditions.
Examples are silicon, germanium, boron, arsenic e.t.c
They are usually found in the middle of the periodic table.
They are not readily alloyed with metals.

Learn more:

Metalloid brainly.com/question/3023499

#learnwithBrainly

7 0

4 years ago

Alchemy is a branch of ancient knowledge that states that the only three essential substances in nature are salt, sulfur, and me

Ivanshal [37]

Answer:

It is pseudoscience because there are at least 118 known elements in nature.

Explanation:

Alchemy is an ancient branch of natural philosophy (not used much anymore).

I also just took the test and it's correct.