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ch4aika [34]
3 years ago
13

The ester of honey and the test ​

Chemistry
1 answer:
muminat3 years ago
4 0

Answer:

I don't get the question

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Where should the author of a case study introduce the central question of the text?
Shtirlitz [24]

Answer:

B. at the beginning  

Explanation:

i took the test

7 0
3 years ago
Read 2 more answers
A sample of H2 gas (12.28 g) occupies 100.0 L at 400.0 K and 2.00 atm. A sample weighing 9.49 g occupies ________ L at 353 K and
lutik1710 [3]

Considering the ideal gas law, a sample weighing 9.49 g occupies 68.67 L at 353 K and 2.00 atm.

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P× V = n× R× T

In this case, you know:

  • P= 2 atm
  • V= ?
  • n= 9.49 gramsx\frac{1 mole}{2 grams} = 4.745moles being 2g/mole  the molar mass of H2, that is, the amount of mass that a substance contains in one mole.
  • R= 0.082 \frac{atmL}{molK}
  • T= 353 K

Replacing:

2 atm× V = 4.745 moles× 0.082\frac{atmL}{molK}× 353 K

Solving:

V = (4.745 moles× 0.082\frac{atmL}{molK}× 353 K)÷ 2 atm

<u><em>V= 68.67 L</em></u>

Finally, a sample weighing 9.49 g occupies 68.67 L at 353 K and 2.00 atm.

Learn more:

  • brainly.com/question/4147359?referrer=searchResults
5 0
3 years ago
13. When iron nad is put in to a beaker containing copper sulphate solution.
svetlana [45]

Answer:

A simple displacement reaction occurs when an iron nail is immersed to a beaker containing copper sulphate solution.

a)

Iron is more reactive than copper. As a result a displacement reaction will take place. The ferrous or Fe (II) irons will move to the solution. The copper ions (Cu II) will get deposited on the nail. This will cause the colour to change from blue to green.

b)

The equation can be written as:

Fe (s) + CuSO4 (aq) -> FeSO4 (aq) + Cu (s)

c)

A chemical change can be described as a change that causes a substance to change to another form. Hence, this reaction is a chemical change.

4 0
3 years ago
A piece of copper has a volume 130 L. What is the mass of the sample, in units of kilograms?
Reil [10]

Answer: The mass of the sample is 1264.800 kg.

Explanation:

Mass of the piece of copper = m

Volume of the copper price = 130 L=130,000 cm^3

1 L= 1,000 cm^3

Density=8.96 g/cm^3=\frac{Mass}{Volume}=\frac{Mass}{130,000 cm^3}

m=Density\times Volume=8.96 g/cm^3\times 130,000=1,264,800 g

m = 1,264,800 g = 1,264.800 kg (1 kg = 1000 g)

The mass of the sample is 1264.800 kg.

3 0
3 years ago
Which element has four times as many protons in its nucleus than are found in Neon?
Svetlanka [38]

Answer:

Zirconium, Zr, 40

Explanation:

Protons can be found by looking at the atomic number. Neon's atomic number is 10, so just multiply 10 by 4 and you get 40.

5 0
3 years ago
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