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JulijaS [17]
3 years ago
8

CAN SOMEONE PLEASE HELP ME!!!! I CAN'T GET ANY HELP IN THE SCIENCE SECTION!!!!!

Chemistry
2 answers:
stepan [7]3 years ago
8 0
A chemical property would have to be something that changes and produces new substances. That is one of the main aspects of chemical changes/properties.

Heating an object to determine it's melting point is a physical property.

Shining a bright lighr and testing for decomposition however may be classifieds as a chemical properties because in the process of decomposition, organic substances are being broken. In physical properties, substances are not being broken.
lorasvet [3.4K]3 years ago
6 0
Answer: shining a bright light on the object and testing for decomposition

Decomposition is the separation of a molecule into its elements or simpler compounds.

And a chemical property is the ability of a substance to combine or to become one or more substances.

Then, testing the ability of an object for decomposition is testing a chemical property.

 

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romanna [79]

Answer:

Coefficient of H^{+}(aq) is more than 4

Explanation:

Oxidation: Sn^{2+}(aq)\rightarrow Sn^{4+}(aq)

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Reduction: Cr_{2}O_{7}^{2-}(aq)\rightarrow Cr^{3+}(aq)

  • Balance Cr: Cr_{2}O_{7}^{2-}(aq)\rightarrow 2Cr^{3+}(aq)
  • Balance O and H in acidic medium: Cr_{2}O_{7}^{2-}(aq)+14H^{+}(aq)\rightarrow 2Cr^{3+}(aq)+7H_{2}O(l)
  • Balance charge: Cr_{2}O_{7}^{2-}(aq)+14H^{+}(aq)+6e^{-}\rightarrow 2Cr^{3+}(aq)+7H_{2}O(l).......(2)

[3\times Equation-(1)]+Equation(2) gives balanced equation:

3Sn^{2+}(aq)+Cr_{2}O_{7}^{2-}(aq)+14H^{+}(aq)\rightarrow 3Sn^{4+}(aq)+2Cr^{3+}(aq)+7H_{2}O(l)

So coefficient of H^{+}(aq) is more than 4

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Answer: 40.1%

Explanation: The mass of calcium in this compound is equal to 40.1 grams because there's one atom of calcium present and calcium has an atomic mass of 40.1 . The molar mass of the compound is 100.1 grams. Using the handy equation above, we get: Mass percent = 40.1 g Ca⁄100.1 g CaCO3 × 100% = 40.1% Ca.

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