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ohaa [14]
3 years ago
13

When light shines on a sample, each element emits specific wavelengths producing a unique fingerprint called its ______ spectra.

A) infrared B) line C) raman D) ultraviolet
Chemistry
2 answers:
nata0808 [166]3 years ago
7 0

Answer:

B) line is the correct answer.

Explanation:

When light shines on a sample, each element emits specific wavelengths producing a unique fingerprint called its line spectra.

The line spectrum is electromagnetic spectra consist of discrete spectra lines.

When the atoms are excited they emit ray of specific wavelengths that correspond to various colors. The emitted ray can be seen as a range of colored line, this range of colored lines is termed as line spectra.

lines spectra are usually utilized to recognize atoms and molecules. Each element has individual line emission spectra.

DanielleElmas [232]3 years ago
3 0

Answer:

B.

Explanation:

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A government laboratory wants to determine whether water in a certain city has any traces of fluoride and whether the concentrat
nexus9112 [7]

<u>Answer:</u> The given sample of water is not safe for drinking.

<u>Explanation:</u>

We are given:

Concentration of fluorine in water recommended = 4.00 ppm

ppm is the amount of solute (in milligrams) present in kilogram of a solvent. It is also known as parts-per million.

To calculate the ppm of fluorine in water, we use the equation:

\text{ppm}=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 10^6

Both the masses are in grams.

We are given:

Mass of fluorine = 0.152mg=0.152\times 10^{-3}g    (Conversion factor:  1 g = 1000 mg)

Mass of water = 5.00 g

Putting values in above equation, we get:

\text{ppm of fluorine in water}=\frac{0.152\times 10^{-3}}{5}\times 10^6\\\\\text{ppm of fluorine in water}=30.4

As, the calculated concentration is greater than the recommended concentration. So, the given sample of water is not safe for drinking.

Hence, the given sample of water is not safe for drinking.

6 0
3 years ago
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DiKsa [7]

Answer:

It has a negative charge and is located in orbitals around the nucleus

Explanation:

5 0
3 years ago
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How would you find the volume of a regular object and irregular object?
Sveta_85 [38]

Answer:

You can find the volume of an irregular object by immersing it in water in a beaker or other container with volume markings, and by seeing how much the level goes up. Or by multiplying all the sides of the container. #markasbrainliest

6 0
4 years ago
What is true of saturated fatty acids?
NemiM [27]
Saturated fatty acids are the type of fatty acids where all of them have single bonds. Their name comes from the fact that usually the second bond they have will be broken up and because of this each half of the bond can be saturated (attached to) with a hydrogen atom that can be available in near vicinity. It is worth noting that thhe fatty acids of fish and plants are mostly unsaturated (either mono-unsaturated or poly-unsaturated) while the fatty acids of animals are mostly saturated.





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6 0
3 years ago
Read 2 more answers
A flask at room temperature contains exactly equal amounts (in moles) of nitrogen and xenon.
zalisa [80]

Answer:

a) Same

b) Nitrogen

c) Same

d) Nitrogen

Explanation:

a)

The formula for partial pressure of a gas is equal to

p_B = n_B \frac{RT}{V}

Here nB is the number of moles .

The number of moles for both the gases are same and hence the partial pressure for the two gases will also be same.

b) The greater average velocity is calculated by using following formula

v_{RMS} = \sqrt{3RTM}

Here M is the molar mass.

Molar mass of nitrogen is greater than the molar mass of xenon and hence nitrogen will have higher greater average velocity

c) As we know, the average kinetic energy of gas particles is dependent on the absolute temperature of gas and if all the gases are at same temperature, their kinetic energy will also be same. Since nitrogen and xenon are at same temperature, their kinetic energy will be same

d) Effusivity is depended directly on  the thermal conductivity,  density and  and the specific heat capacity.

All these three parameters are higher in case of nitrogen. Thus, it will effuse first

4 0
3 years ago
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