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ioda
3 years ago
7

Explain why the observation that the sun sets in the west could be called a scientific law.

Chemistry
2 answers:
aleksklad [387]3 years ago
6 0

Answer;

It is because it has been observed repeatedly and does not attempt to explain why the sun sets in the west.

Explanation;

-A scientific law is a statement of a relation that expresses a fundamental principle of science. A scientific law is a description of a natural event.

-The sun sets in the west on Earth and most of the planets in our solar system. This is a description of a natural event and thus it could be considered a law on Earth.


tatiyna3 years ago
4 0
 It is something that has been proven and has had the same result for multiple years
 
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The _________ force between the sun and the Earth keeps the Earth in its orbit. The period of ______ is the time it takes for Ea
nalin [4]
Gravitational and revolution
6 0
3 years ago
Compared to the charge and mass of a proton, an electron has _____.
Darya [45]

Answer:

1/1836

Explanation:

An electorn's mass is so little that it is negligible.

7 0
3 years ago
Net ionic equation for NaOH(aq) + NH4Br(aq) —> NaBr(aq) + NH3(g) + H2O(l)
Greeley [361]

Answer:

OH⁻(aq) + NH₄⁺(aq) →  NH₃(g) + H₂O(l)

Explanation:

The net ionic equation is a way yo write a chemical equation that list only the species that are involved in the reaction.

For the reaction:

NaOH(aq) + NH₄Br(aq) → NaBr(aq) + NH₃(g) + H₂O(l)

Ionic equation is:

Na⁺(aq) + OH⁻(aq) + NH₄⁺(aq) + Br⁻(aq) → Na⁺(aq) + Br⁻(aq) + NH₃(g) + H₂O(l)

<em>-Ions comes from the species that are in aqueous phase-</em>

And net ionic equation is:

<em>OH⁻(aq) + NH₄⁺(aq) →  NH₃(g) + H₂O(l)</em>

<em />

<em />

8 0
3 years ago
How to convert 0.000984 into scientific notation?
Olin [163]
9.84 * 10^-4
The easiest way I remember is making the decimal first and then seeing what way the 0's are. In this case it is going left so it will be a negative exponent and if you count from 9.84 and move the decimal left 4 that's your answer.
7 0
4 years ago
Calculate the mass of water vapour present in a room of volume 400 m3 that contains air at 27 °C on a day when the relative humi
Alex73 [517]

Answer:

Mass of water = 6251. 706g or 6.25Kg

Explanation:

Relative humidity = (actual vapor pressure/saturation vapor pressure) * 100%

Actual vapor pressure, Pw = relative humidity * saturation vapor pressure

Pw = 60% * (35.6 *0.001)atm = 0.0216atm

Note: 1mbar = 0.001atm

Using the ideal gas equation: PV=nRT; where P = Pw= 0.02136atm, V= (400

* 1000)dm^3, R= 0.082 atmdm^3/kmol, T= (27+273)K, n = number of moles

Note: 1m^3 = 1000dm^3,R is the molar gas constant.

Making n subject of the formula, n = PV/RT

n= (0.02136 * 400000)/(0.082 * 300) = 347.317 moles

Mass (g) = number of moles (n) * molar mass

molar mass of water=18g

Mass of water = 347.317 * 18 = 6251. 706g or 6.25Kg

6 0
3 years ago
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