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Eddi Din [679]
2 years ago
13

Over time, an iron nail reacts with water to produce iron oxide, or rust. Which of the following is a signal that rusting has ta

ken place?
Chemistry
2 answers:
Lynna [10]2 years ago
7 0
Red or orange color is usually a sign of rust
lapo4ka [179]2 years ago
3 0

Explanation:

When iron reacts with the moisture present in air then an oxide layer tends to develop on the surface of iron. This process is known as rusting of iron.

Chemical formula of rust is Fe_{2}O_{3}.xH_{2}O. This layer of oxide on the surface of iron is reddish-brown in color.

For example, when an iron nail rusts then color of the nail changes to reddish-brown.

This change is a chemical change as a new compound iron oxide has formed in this process of rusting.

Hence, we can conclude that a color change on the nail from silver to reddish-brown is a signal that rusting has taken place.

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If you start with 0.30 m mn2 , at what ph will the free mn2 concentration be equal to 4.6 x 10-11 m?
aksik [14]

If you start with 0.30 m Mn₂ , at 12.5 pH, free Mn₂ concentration be equal to 4.6 x 10⁻¹¹ m

Initial molarity of Mn₂ = 0.30 M

Final molarity of Mn₂ = 4.6 x 10⁻¹¹

pH = ?

Ksp [Mn(OH)₂] = 4.6 x 10⁻¹⁴ (standard value)

Write the ionic equation

    Mn(OH)₂   →    Mn⁺² + 2OH⁻

    [Mn⁺²] = 4.6 x 10⁻¹¹

We will calculate the concentration of OH⁻ by using Ksp expression

    Ksp = [Mn⁺²][OH-]²

    [Mn⁺²][OH⁻]² = 4.6 x 10⁻¹⁴

    [OH⁻]² = 4.6 x 10⁻¹⁴ / 4.6 x 10⁻¹¹

    [OH⁻]² = 10⁻³

    [OH⁻] = (10⁻³)¹⁽²

    [OH⁻] = 0.0316 M

Calculate the pOH

    pOH = -log [OH⁻]

    pOH =  -log [0.0316]

    pOH = 1.5

Now calculate pH

   pH = 14 - pOH

   pH = 14 - 1.5

   pH = 12.5

You can also learn about molarity from the following question:

brainly.com/question/14782315

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What is 1006 in scientific notation?
vladimir1956 [14]

Answer:

1.006 * 103

Explanation:

Add the number between 1 and 9 and add a decimal accordingly . so the answer is 1.006 multiplied by 10 raised to power 3

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