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Maru [420]
3 years ago
12

Which of the following describes the correct order for using the scientific

Chemistry
2 answers:
larisa [96]3 years ago
8 0
A. is the answer
if u have any doubts ask me
please mark as brainliest
ziro4ka [17]3 years ago
6 0

Answer:

A

Explanation:

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Friction is a force that opposes motion. When friction is present, heat is generated.
anyanavicka [17]

Answer:

I think it is: Some of the energy is converted into thermal energy.

Explanation:

Please let me know if I am wrong so I can fix it :)

8 0
2 years ago
Read 2 more answers
If a 0.4681 g Mg strip reacts with 0.650 M HCl in a 139.3 mL flask at 25oC, what is the minimum volume (mL) of HCl needed to com
Marizza181 [45]
The reaction between the magnesium, Mg, and the hydrochloric acid, HCl is given in the equation below,

    Mg + 2HCl --> H2 + MgCl2

The number of moles of HCl that is needed for the reaction is calculated below.
    n = (0.4681 g Mg)(1 mol Mg/24.305 g Mg)(2 mol HCl/1 mol Mg)
    n = 0.0385 mols HCl

From the given concentration, we calculate for the required volume. 
    V = 0.0385 mols HCl/(0.650 mols/L)
     V = 0.05926 L or 59.26 mL

<em>Answer: 59.26 mL of HCl</em>
7 0
2 years ago
What is the difference between an atone and a molecule
Step2247 [10]

Answer:

Explanation:

Molecules contain two or more atoms and are held together by covalent bonds, whereas compounds are held together by ionic bonds. Two or more elements bonded together through ionic attraction. ... The atoms within a compound also must be different from each other, whereas a molecule can consist of only one element

8 0
2 years ago
Question 13: Consider the strength of the Hβ absorption line in the spectra of stars of various surface temperatures. This is th
finlep [7]

Answer:

The absorption and strength of the H-beta lines change with the temperature of the stellar surface, and because of this, one can find the temperature of the star from their absorption lines and strength. To better comprehend, let us look into the concept of the atom's atomic structure.  

Atoms possess distinct energy levels and these levels of energy are constant, that is, the temperature has no influence on it. However, temperature possesses an influence on the electron numbers found within these levels of energy. Therefore, to generate an absorption line of hydrogen in the electromagnetic spectrum's visible band, the electrons are required to be present in the second energy level, that is when it captivates a photon.  

Therefore, after captivating the photons the electrons jump from level 2 to level 4, which shows that there is an increase in the stellar surface temperature and at the same time one can witness a decline in the strength of the H-beta lines. In case, if the temperature of the surface increases too much, then one will witness no attachment of electron with the hydrogen atom and thus no H lines, and if the temperature of the surface becomes too low, then the electrons will stay in the ground state and no formation of H lines will take place in that condition too.  

Hence, to generate a very robust H line, after captivating photons the majority of the electrons are required to stay in the second energy level.  

5 0
3 years ago
A given volume of methane diffuses in 20 seconds. How long will it take the same volume of hydrogen to diffuse under the same co
Airida [17]

The time taken for the same volume of methane gas to diffuse is 7.1 s.

<h3>Rate of gas diffusion</h3>

The rate at which a given mass of diffuses is inversely proportional to the molar mass of the gas.

\frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} }

where;

  • M1 is the molar mass of methane (CH4) = 16 g
  • M2 is the molar mass of hydrogen as = 2
  • t1 is time taken for methane = 20 s
  • t2 is the time taken for hydrogen = ?

\frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} }\\\\\frac{t_2}{20} = \sqrt{\frac{2}{16} }\\\\\frac{t_2}{20} = \frac{\sqrt{2} }{4} \\\\t_2 = \frac{20\sqrt{2} }{4} \\\\t_2 = 5\sqrt{2} \\\\t_2 = 7.1 \ s

Thus, the time taken for the same volume of methane gas to diffuse is 7.1 s.

Learn more about rate of gas diffusion here: brainly.com/question/26696466

6 0
2 years ago
Read 2 more answers
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