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Gemiola [76]
3 years ago
11

Helium is an odorless, colorless gas at room temperature. It is less dense than air. That's why helium balloons float. It is a n

on-reactive gas, a member of the Noble gas family. Its melting point is -272.2 oC and its boiling point is -268.93 o A chemical property of Helium is?
Chemistry
1 answer:
Zolol [24]3 years ago
5 0

Answer:

  • Non-flammable
  • It is the only element that doesn't solidify under ordinary pressure and remains a liquid enven at absolute zero.
  • When it electricity runs through helium it glows a pale peach color.
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Why can’t the calvin cycle run if the light reactions don’t occur?
zysi [14]

Answer:

Because the Calvin cycle is dependent on the the product from light reaction.

Explanation:

The Calvin cycle is the light independent phase of photosynthesis during which carbon is fixed. This step requires energy generated during the light dependent phase of the photosynthesis.

Hence, if the light dependent reaction does not occur, the required energy to drive carbon fixation will be lacking and the Calvin cycle will not be able to proceed.

3 0
3 years ago
Please help this chemistry question!<br> ty if u answer
Strike441 [17]
H20) Is the answer Right

8 0
3 years ago
100.0 mL of 3.8M NaCN, the minimum lethal concentration of sodium cyanide in blood serum
9966 [12]

The given question is incomplete. The complete question is:

Calculate the number of moles and the mass of the solute in each of the following solution: 100.0 mL of 3.8 × 10−5 M NaCN, the minimum lethal concentration of sodium cyanide in blood serum

Answer: The number of moles and the mass of the solute are 0.38\times 10^{-5} and 18.62\times 10^{-5}g respectively

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

Molarity=\frac{n\times 1000}{V_s}

where,

n = moles of solute

V_s = volume of solution in ml

3.8\times 10^{-5}M=\frac{n\times 1000}{100.0}

n=0.38\times 10^{-5}

n = moles of NaCN = \frac{\text {given mass}}{\text {Molar mass}}

0.38\times 10^{-5}=\frac{x}{49g/mol}

x=18.62\times 10^{-5}g

Thus the number of moles and the mass of the solute are 0.38\times 10^{-5} and 18.62\times 10^{-5}g respectively

6 0
3 years ago
How many grams of Sodium hydroxide are present in 750.0 mL of 2.5 M sodium hydroxide solution?
Elis [28]

75 g of sodium hydroxide is present in the solution.

<u> </u><u>Explanation</u><u> :</u>

Given :

Molarity  of sodium hydroxide solution= 2.5 M

Litres of Solution = 750 mL

Molar mass of NaOH = 40 g/mol

To Find:

Grams of Sodium Hydroxide =?

Solution :

Molarity of the solution is expressed in Litres, So Converting 750.0 mL to Litres we have

750.0mL=0.750 Litres

Grams of Solution ,  moles= M\times L

Where  

M = Molarity  

L = litres of solution

mol= moles of solute

mol= 2.5 \times \frac{750}{1000}

Mol = 1.875  

Also the molecular weight of NaOH is  40.00 g/mol

Grams of sodium hydroxide = 1.875 mol * 40.00 g/mol = 75 g

5 0
3 years ago
Ammonia can be made from the reaction N2(g) + 3 H2(g) 2 NH3(g). The reaction quotient is Q = 4.50 x 10-4 and Keq = 6.02 x 10-2.
bonufazy [111]
C. Is the answer to this
5 0
3 years ago
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