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Firdavs [7]
2 years ago
6

Evaluate each scenario to determine whether it represents a chemical reaction.

Chemistry
2 answers:
vova2212 [387]2 years ago
8 0

Explanation:

A chemical reaction is one in which a chemical change occurs.

During a chemical change;

  • The process is irreversible
  • New kinds of matter produced
  • There is a change in mass

Based on these premise;

 Baking  cake batter is a chemical reaction because you cannot reverse the process

  Shredding a paper is not a chemical reaction because no new kind of matter is produced.

  Twisting of a metal wire is not a chemical reaction

   Yellowing of newspaper in sunlight is a chemical change. The process cannot be reversed

Arada [10]2 years ago
3 0

Answer:

1. yes 2. no 3.no 4.yes

Explanation:

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Determine the pH of a 2.8 ×10−4 M solution<br> of Ca(OH)2.
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Answer:

pH = 10.75

Explanation:

To solve this problem, we must find the molarity of [OH⁻]. With the molarity we can find the pOH = -log[OH⁻]

Using the equation:

pH = 14 - pOH

We can find the pH of the solution.

The molarity of Ca(OH)₂ is 2.8x10⁻⁴M, as there are 2 moles of OH⁻ in 1 mole of Ca(OH)₂, the molarity of [OH⁻] is 2*2.8x10⁻⁴M = 5.6x10⁻⁴M

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pH = 14-pOH

<h3>pH = 10.75</h3>
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