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Romashka [77]
3 years ago
9

Which property describes a mixture? It cannot be separated by physical methods. It has a single chemical composition. It cannot

have more than one state of matter. It cannot be described by a chemical symbol or formula.
Chemistry
2 answers:
natima [27]3 years ago
7 0

Answer:

it cannot be separated by physical methods

Explanation:

katrin [286]3 years ago
7 0
A: It cannot be separated by physical methods.
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How many moles in 68.1 grams of Cu(OH)2
Andrew [12]

To do this, you would first add together the molar mass of all involved elements, to find how many grams are in a mole of Cu(OH)2. Keep in mind, the molar mass is equal to the atomic mass of an element in grams. For example the molar mass of copper (Cu) would be 63.55 (with 2 sig. figs.)

Therefore, now we add together the mass of all elements involved.

Cu: (63.55)+O2(15.99x2=31.98)+H2(1.01x2=2.02)

63.55+31.98+2.02= 97.55g per mole of Cu(OH)2.

Now, divide what we have by how much it takes to get a mole of the stuff.

68.1/97.55= 0.698mol Cu(OH)2


6 0
3 years ago
for the following reaction: 1 CuO + 1 H2 --> 1 Cu +1H2O, what is the quantity of moles of H2O when there are 240 grams of CuO
Ber [7]

Considering the reaction stoichiometry, the quantity of moles of H₂O produced is 3.02 moles.

The balanced reaction is:

CuO + H₂ → Cu + H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:  

  • CuO= 1 mole
  • H₂= 1 mole
  • Cu= 1 mole
  • H₂O= 1 mole

The molar mass of the compounds present in the reaction is:

  • CuO= 79.55 g/mole
  • H₂= 2 g/mole
  • Cu= 63.55 g/mole
  • H₂O: 18 g/mole

Then, by reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of mass of each compound participate in the reaction:  

  • CuO= 1 mole× 79.55 g/mole= 79.55 grams
  • H₂= 1 mole× 2 g/mole= 2 grams
  • Cu= 1 mole× 63.55 g/mole= 63.55 grams
  • H₂O: 1 mole× 18 g/mole= 18 grams

Then, it is possible to determine the moles of H₂O necessary by the following rule of three:  If by reaction stoichiometry 79.55 grams of CuO produces 1 mole of H₂O, 240 grams of CuO produces how many moles of H₂O?

molesofH_{2} O=\frac{240 grams of CuOx 1 mole ofH_{2} O }{79.55 grams of CuO}

<u><em>moles of H₂O= 3.02 moles</em></u>

Finally, the quantity of moles of H₂O produced is 3.02 moles.

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6 0
3 years ago
What did the 15th amendment do
Alisiya [41]

The 15th Amendment to the Constitution granted African American men the right to vote by declaring that the "right of citizens of the United States to vote shall not be denied or abridged by the United States or by any state on account of race, color, or previous condition of servitude."

6 0
4 years ago
Consider the electronic configuration for the following elements:
zavuch27 [327]

Answer:

Explanation:

P. Group 6 , block p

Q. Group 1 , block s

R. Group 3, block s

S . Group 5.block p

Q2p

Q3S

5 0
3 years ago
Which state of matter has a definite volume and takes the shape of its container?
gladu [14]

Answer:

solid

Explanation:

liquid can't take the shape of the container because it flows freely and it doesn't have a definite shape and it has space between it e.g water

gas also doesn't shape and e. g air

but solid takes a definite shape because it doesn't have space in between of

4 0
3 years ago
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