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storchak [24]
3 years ago
9

Which changes are evidence of a chemical reaction? drag each item to the appropriate bin?

Chemistry
1 answer:
mr Goodwill [35]3 years ago
8 0
<span>Two clear solutions are mixed and form a cloudy solution, A beaker of water becomes hot to touch upon adding detergent powder to it, Bubble formation on chalk added to acid. These are the evidence of a chemical reaction.</span>
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Determine how many moles of CO2 are required to produce 11.0 mol of glucose,
drek231 [11]

Answer:

Determine how many moles of CO2 are required to produce 11.0 mol of glucose,

i need points thanks for CO2moles

7 0
3 years ago
A chemist wants to extract copper metal from copper chloride solution. The chemist places 0.50 grams of aluminum foil in a solut
Irina-Kira [14]

Answer:

Approximately 0.36 grams, because copper (II) chloride acts as a limiting reactant.

Explanation:

  • It is a stichiometry problem.
  • We should write the balance equation of the mentioned chemical reaction:

<em>2Al + 3CuCl₂ → 3Cu + 2AlCl₃.</em>

  • It is clear that 2.0 moles of Al foil reacts with 3.0 moles of CuCl₂ to produce 3.0 moles of Cu metal and 2.0 moles of AlCl₃.
  • Also, we need to calculate the number of moles of the reported masses of Al foil (0.50 g) and CuCl₂ (0.75 g) using the relation:

<em>n = mass / molar mass</em>

  • The no. of moles of Al foil = mass / atomic mass = (0.50 g) / (26.98 g/mol) = 0.0185 mol.
  • The no. of moles of CuCl₂ = mass / molar mass = (0.75 g) / (134.45 g/mol) = 5.578 x 10⁻³  mol.
  • <em>From the stichiometry Al foil reacts with CuCl₂ with a ratio of 2:3.</em>

∴ 3.85 x 10⁻³  mol of Al foil reacts completely with 5.578 x 10⁻³  mol of CuCl₂ with <em>(2:3)</em> ratio and CuCl₂ is the limiting reactant while Al foil is in excess.

  • From the stichiometry 3.0 moles of  CuCl₂ will produce the same no. of moles of copper metal (3.0 moles).
  • So, this reaction will produce 5.578 x 10⁻³ mol of copper metal.
  • Finally, we can calculate the mass of copper produced using:

mass of Cu = no. of moles x Atomic mass of Cu = (5.578 x 10⁻³  mol)(63.546 g/mol) = 0.354459 g ≅ 0.36 g.

  • <u><em>So, the answer is:</em></u>

<em>Approximately 0.36 grams, because copper (II) chloride acts as a limiting reactant.</em>

5 0
3 years ago
Other than reducing greenhouse gas emissions, why would an entity switch to an alternative energy solution
Alika [10]

Answer:

renewable energy sources such as solar and wind DONT emit carbon dioxide and other greenhouse gases that contribute to global warming

Explanation:

8 0
2 years ago
Which statement best describes the whether shown by the purple combination of semicircles and triangles on a line on a weather m
iren2701 [21]
It seems that you have missed to attach the given map and options for us to answer this question, so I had to look for it. Anyway, here is the answer. The statement that best describes the whether shown by the purple combination of semicircles and triangles on a line on a weather map is a <span>cold front can cause heavy rain, thunder, and lightning. Hope this helps.</span>
3 0
3 years ago
Read 2 more answers
Hi ! Could someone help me out with this last part to my chemistry practice ? Thank you !
skelet666 [1.2K]

After 100years, sample is 250g

After 200 years, sample is 125g

After 300years, sample is 62.5 g

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3 years ago
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