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3 years ago

Explain how the scientific method helps scientists.

1 answer:

4 0

As scientists work hard for the results, they may get biased and may sometimes come up with an answer that is based on that. In order to avoid such circumstances, scientific method is put into practice.

Explanation:

Personal preferences can some times affect a scientific answer. That is not desirable as the experiments will be repeated by different individuals and the same results should be obtained.
That leads to the importance of documentation of systemic observation, formation of hypothesis and the experimentation to confirm the results, which is the scientific way of coming up with the answer to a scientific problem.
Scientific methods thus helps in bringing more credibility to findings of the scientists and can be repeated by others to obtain the same results.

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3 years ago

What happens to elements when they combine together chemically ?

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3 years ago

Arrange the following gases in order of decreasing density at STP. Ne, O2, F2, Cl3

kipiarov [429]

Answer: Cl₃ > F₂ > O₂ > Ne

Explanation:

1) All the gases are at the same temperature and pressure: STP (O°, 1 atm).

2) All the gases are represented by one molecule (or mole of molecules, it is the same for our puroposes).

3) As per Avogadro's law and the ideal gas equation, the same number of particles (of any gas) occupy the same volume at the same temperature and pressure.

For example, at STP the volume of 1 mol of gas is 22.4 liter.

4) Since, density is equal to mass / volume, and you assume the same number of molecules of each gas, the order of the densities is the same that the order of the molar masses.

5) Then, you just need to state the molar mass of each gas and order in decreasing order of molar mass to have the correct order for density.

6) Molar masses:

i) Ne: 20.180 g/mol

ii) O₂: 2× 15.999 g/mol = 31.998 g/mol

iii) F₂: 2×18.998 g/mol = 37.996 g/mol

iv) Cl₃: 3×35.453 g/mol = 106.359

7) Then the order is: 106.359 > 37.996 > 31.998 > 20.18 ⇒ is Cl₃ > F₂ > O₂ > Ne.

Note: the values calculate are not of densities but of molar masses. The order is what is the same.

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3 years ago

Read 2 more answers