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kirill [66]
3 years ago
11

5. All of the following statement describes compounds, EXCEPT?

Chemistry
2 answers:
Advocard [28]3 years ago
5 0

Answer:

C. Compounds can be separated using ordinary physical means.

Explanation:

A compund is a pure substance composed of two or more different atoms chemically bonded to one another. So it can't be separated by physical means and only can be destroyed by chemical means

Sveta_85 [38]3 years ago
3 0

Answer:

C

Explanation:

Compounds cannot be separated by any physical means.

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How many grams of water can be produced in the combination of
mel-nik [20]

If 14 grams of hydrogen reacted with 24.7 grams of oxygen 27.7875 grams of water will be formed.

Explanation:

2H2+O2----------->2H2O.

  • From the above equation, we can say that 4g of Hydrogen will react with 32 g of oxygen.
  • In this question, Hydrogen is in excess amount.
  • 32 g of Oxygen will react with = 4 g of H2.
  • Therefore 24.7g of Oxygen will react with =24.7x4/32= 3.0875 g H2.  
  • The remaining 10.9125g of H2 will be left unreacted.
  • Therefore the amount of water formed=(24.7+3.0875)=27.7875 g

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3 years ago
As the frequency of a wave generated by a radio transmitter is increased ,the wavelength
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For waves velocity (v) is equal to the wavelength (λ) times frequency (f). (They are inversely proportional)

V=λf

Since V is constant, if frequency increases, wavelength decreases.
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3 years ago
Write a balanced half-reaction describing the oxidation of solid chromium to aqueous chromium(IV) cations.
Pachacha [2.7K]

Answer:

Cr(s) ⟶ Cr⁴⁺(aq) + 4e⁻  

Explanation:

1. Write the skeleton half-reaction

Cr(s) ⟶ Cr⁴⁺(aq)

2. Balance charge

Add electrons to the side that needs them.

You have 4+ on the right and 0 on the left. You must add 4e⁻ to the right to balance the charge.

Cr(s) ⟶ Cr⁴⁺(aq) + 4e⁻

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The standard on which the atomic mass unit is based is the mass of a
pashok25 [27]

Answer;

D. carbon-12 atom

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-One atomic mass unit is the mass that is exactly equal to one-twelfth the mass of one carbon-12 atom. Therefore, the mass of carbon-12 is 12 amu and this provides the standard that is used in measuring the atomic mass of all other elements.

-The atomic mass of carbon is 12.01 and not 12.00 in the periodic table.

-Due to the fact that there are more than one element for most naturally occurring elements, the average mass of the naturally occurring mixture of isotopes is taken while determining the atomic mass of an element.

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A. elements

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3 years ago
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