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siniylev [52]
3 years ago
12

From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 486.1 nanome

ters (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 486.0 nm. What can we conclude?
Chemistry
1 answer:
andriy [413]3 years ago
4 0

Answer:

The source of the hydrogen is coming towards us.

Explanation:

The wavelength of the hydrogen is decreasing as it goes from 486.1 nm to 486.0 nm.

<u>The wavelength of a wave is directly proportional to the distance between the observer and the object.</u>

For example, when the observer is far from the source, the observer will observe a longer wavelength which corresponds to red color if it is in the visible region.

<u>As the wavelength is decreasing that means that the hydrogen particle ( source may be a star) is coming towards the observer.</u>

Thus, we can conclude that the source of the hydrogen is coming towards us.

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85g=kg?<br> Unit conversion.
Paraphin [41]

Answer:

0.085 kg

Explanation:

1 g=0.001 kg  OR 1 kg=1000 g

 so \frac{85}{1000}=0.085 kg

3 0
3 years ago
The anion of which element has a –1 charge?
vovangra [49]
An anion is a negatively charged ion. An element can become an anion if it takes an extra electron such that it has one more electron than protons.
Atoms would preferentially taken an extra electron so that it can have a full octet and be more stable.

\sf Cl^-, Br^-, F^- are some of the few elements that would have a -1 charge.
6 0
3 years ago
A sample of gas in a balloon has an initial temperature of 20. ∘C and a volume of 1.92×103 L . If the temperature changes to 68
morpeh [17]

Answer:

\boxed{2.23 \times 10^{3} \text{ L}}

Explanation:

The pressure is constant, so we can use Charles' Law.

\dfrac{ V_{1} }{T_{1}} = \dfrac{ V_{2} }{T_{2}}

Data:

V₁ = 1.92 × 10³ L; T₁ = 20 °C  

V₂ = ?;                 T₂ = 68 °C

Calculations:

(a) Convert temperatures to kelvins

T₁ = (20 + 273.15) K = 293.15 K

T₂ = (68 + 273.15) K = 341.15 K

(b) Calculate the volume

\dfrac{ 1.92 \times 10^{3}}{293.15} = \dfrac{ V_{2}}{341.15}\\\\6.550 = \dfrac{ V_{2}}{341.15}\\\\V_{2} = 6.550 \times 341.15 = 2.23 \times 10^{3} \text{ L}

The new volume of the gas is \boxed{2.23 \times 10^{3} \text{ L}}.

6 0
3 years ago
Observe: click reset. select the gas collection setup. chemists use this apparatus to collect any gases produced in the reaction
Oxana [17]

Hello. Although it is not possible to see the video to which the question refers, we can see, in the question, that water is removed from the cylinder as a gas is added to the same cylinder. So we can see that a gas was produced in the reaction, through the displacement of water, that is, if the water starts to be removed from the cylinder, it is because the reaction is producing a gas. If the gas is not produced, water will not come out of the cylinder.

6 0
3 years ago
A 2000 g sugar-water solution contains 200 g of sugar. The concentration of the solution by mass is
dalvyx [7]
The answer is C, 10%.
3 0
2 years ago
Read 2 more answers
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