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Tju [1.3M]
3 years ago
5

Samira has two pens. She wants to know which pen was used to write a note. She labels her pens A and B. She puts a sample of ink

from each pen onto some chromatography paper. Then she puts a sample of the ink from the note onto the chromatography paper.
Chemistry
1 answer:
Ann [662]3 years ago
8 0

Answer:

b

Explanation:

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A gas with 4.0 atmospheres of pressure has a temperature of 27°C.
Gala2k [10]

Answer:

7.462

Explanation:

Well, every time that the tempurature is increased, the atmspheric pressure is increased by 0.574%. This would then mean that you would have 0.574  times

13. That would then equal 7.462. I hope this helps.

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What is true of all body except sex cells
Evgesh-ka [11]
They can all by seperrated or replicated.

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Calculate the volume of a balloon that can hold 113.4 g of nitrogen dioxide, NO2 gas at STP-
Karolina [17]

Answer:

55.18 L

Explanation:

First we convert 113.4 g of NO₂ into moles, using its molar mass:

  • 113.4 g ÷ 46 g/mol = 2.465 mol

Then we<u> use the PV=nRT formula</u>, where:

  • P = 1atm & T = 273K (This means STP)
  • n = 2.465 mol
  • R = 0.082 atm·L·mol⁻¹·K⁻¹
  • V = ?

Input the data:

  • 1 atm * V = 2.465 mol * 0.082atm·L·mol⁻¹·K⁻¹ * 273 K

And <u>solve for V</u>:

  • V = 55.18 L
6 0
3 years ago
When magnesium ribbon is ignited, it gives off a white fume of magnesium oxide. What is this type of reaction?
Svetllana [295]
This reaction is called a composition reaction.
3 0
4 years ago
Group 17 elements (for example, chlorine) in the periodic table are known as
BaLLatris [955]

Explanation:

The answer is halogens

Halogens are reactive non metallic elements that form strongly acidic compounds with Hydrogen to form simple salts

4 0
3 years ago
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