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Mumz [18]
3 years ago
5

Mn or Co is treated with 1 mL of 6 M HNO3 followed immediately by the drop-wise addition of 3% hydrogen peroxide until the preci

pitate fully dissolves. The test tube is then heated in a water bath until bubbling ceases. At this stage of the experiment, which elements could be found in the resulting LIQUID?
Chemistry
1 answer:
ki77a [65]3 years ago
3 0

Answer:

Mn, Co,  H, N and O

Explanation:

When metallic Mn or Co reacts with concentrated HNO₃, they dissolve completely in the acid . The products formed are the nitrates of the metals, water and a mixture of NO and NO₂ gases. Hydrogen peroxide is added to oxidize any NO to NO₂ which is less harmful.

The equations of the reaction are given below;

Mn + HNO₃ ====> Mn(NO₃)₂ + NO + H₂O

Co + HNO₃ ====> Co(NO₃)₂ + NO + H₂O

H₂O₂ + NO ====> H₂O + NO₂

The resulting solution will be the soluble nitrates of manganese and cobalt as well water and this solution contains the following elements; Mn, Co, N, H And O.

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The correct answer is option 1. Carbon dioxide is nonpolar because the shape of the molecule  is symmetrical. It is a linear molecule where the oxygen atoms are symmetrical on each end. CO2 molecule do not have a region of unequal sharing.
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All cells must have energy to function. Most of the energy used by the cells in your body is produced by cellular respiration. I
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In cellular respiration, cells use <u>oxygen</u> to release energy stored in <u>glucose</u>.

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5 0
3 years ago
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Consider the following four structures: What is the relationship of I and II? What is the relationship of I and III? What is the
daser333 [38]

Answer:

The different structures are shown in the attachment.

I and II - structural isomers

I and III - Structural isomers

I and IV - structural isomers

II and III - structural isomers

II and IV - structural isomers

III and IV - stereoisomers

Explanation:

The knowledge of Isomerism is tested here; there are two types of isomerism ; structural and stereoisomerism.

  • Structural Isomers have similar molecular and different double bond positioning, these occurs mostly in ALKENE FAMILY.
  • Stereo-isomers have the same molecular formular and similar patterns but differ in their spatial arrangement. trans and cis are typical examples of stereo-isomers.

From the question; Relationship between I and II is that they are structural isomers since they have the same molecular formula, but different bond atom arrangement and infact they are the same compound.

  • Relationship between I and III is that they are structural isomers with similar molecular formular but differ in the double bond position.
  • Relationship between I and IV is that they are structural isomers with similar molecular formula but different double bond arrangement.
  • Relationship between II and III is that they are structural isomers with similar molecular formular but different double bond position
  • Relationship between II and IV is that they are also structural isomers with the same molecular formular but different double bond position.
  • Relationship between III and IV is that they are stereo-isomers with same molecular formula but different spatial arrangement, hence cis and trans.

4 0
3 years ago
How many moles of N2 are need to fill a 35 L tank at standard temperature and pressure?
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1.56 moles of N2 are needed to fill a 35 L tank at standard temperature and pressure. Details about moles can be found below.

<h3>How to calculate number of moles?</h3>

The number of moles of a substance can be calculated using the following formula:

PV = nRT

Where;

  • P = pressure
  • V = volume
  • n = number of moles
  • R = gas law constant
  • T = temperature

At STP;

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  • P = 1 atm
  • R = 0.0821 Latm/molK

1 × 35 = n × 0.0821 × 273

35 = 22.41n

n = 35/22.41

n = 1.56mol

Therefore, 1.56 moles of N2 are needed to fill a 35 L tank at standard temperature and pressure.

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4 0
2 years ago
How to find the Ka of an acid?
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We know that acids have a pH of under 7. 

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