potassium, a soft, grey metal, reacts violently with water to produce heat and light. What visualclue here indicates that a chemical reaction has occurred?A) Bubbles were observedB) A precipitate formedC) The color of the metal is greyD) Energy change in the form of heat and light

Answered: potassium, a soft, grey metal, reacts…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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potassium, a soft, grey metal, reacts violently with water to produce heat and light. What visual
clue here indicates that a chemical reaction has occurred?
A) Bubbles were observed
B) A precipitate formed
C) The color of the metal is grey
D) Energy change in the form of heat and light

Expert Solution

Step 1: Concept

Generally when metals react with water the metal hydroxide is formed and hydrogen gas is evolved.

When potassium(K), a soft , grey metal reacts with water there is formed potassium hydroxide (KOH) and hydrogen gas (H₂) with a large amount of heat.So it is an exothermic reaction.

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