When a metal is placed in water, what is experimental evidence that a reaction occurred? A. pink...

Question:

When a metal is placed in water, what is experimental evidence that a reaction occurred?

A. pink color of solution upon addition of phenolphthalein

B. bubbles

C. a solid precipitate forms

D. both A and B

E. none of the above; metals do not react with water

Metal :

  • Metals are generally present in a solid state at room temperature with 1 to 3 electrons in their outermost shell.
  • They are lustrous and hard with high density.
  • They show vigorous reaction with water.

Answer and Explanation: 1

  • Option B is the correct answer.

When metal like sodium placed in water gives following reaction.

{eq}Na+H_2O \to NaOH+H_2 {/eq}

We can see in the above reaction that sodium reacts with water to form sodium hydroxide and hydrogen gas. This released hydrogen gas forms bubble in the solution.


Learn more about this topic:

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Metals on the Periodic Table: Definition & Reactivity

from

Chapter 28 / Lesson 45
21K

What are metals? Learn the definition and different types of metals. See the reactivity and examples of metals present in the periodic table.


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