3 years ago

What kinds of materials can laboratories test?

Chemistry

1 answer:

Jet001 [13]3 years ago

7 0

All. It depends on the lab setup, equipment, and expertise.

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A sample of water at 20 degrees c contains what bonds

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What is an atomic number? An atomic mass?

mrs_skeptik [129]

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The atomic number is the number of the elements inside the periodic table and the mass is the weight or a number under the elements.

Explanation:

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Which of the following reactions could be used to extract the lead from the lead nitrate?

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Answer:

Option b. Decomposition

Followed by a reduction process using charcoal

Explanation:

Lead can be obtained from lead nitrate by thermal decomposition of lead nitrate as shown below:

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The PbO obtained is reduced by charcoal(C) to obtain the metallic Pb as shown below:

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The first excited vibrational energy level of diatomic chlo- rine (Cl2) is 558 cm^-1 above the ground state. Wave- numbers, the

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Answer:

The answer is "0.0000190 and 2.7 J".

Explanation:

$\to P_4=\frac{e^{-\beta}(4+\frac{1}{2}) hev}{2vb}\\\\$

$=\frac{e^{-9(1.35)}}{0.278v}\\\\=\frac{e^{-12.5}}{0.278}\\\\=\frac{0.000005285}{0.278}\\\\=0.0000190$

Given:

$h=6.626 \times 10^{-34}\\\\c=3\times 10^{10}\\\\v=558\ cm^{-1}\\\\K=1.38 \times 10^{-23}\\\\ T=298\\\\$

$E=\frac{hcv}{KT}\\\\$

by putting the value into the above formula so, the value is 2.7 J

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