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2 Why is the observation of an increase in temperature when two substances are mixed not absolute proof that a chemical reaction occurred? 3. When lead (II) nitrate and sodium sulfide are mixed a black solid precipitate is formed. What is the identity of that compound? 4. A solution of Hg(NO3)2 is mixed with a solution of KBr. Both of these solutions are colorless. A white precipitate forms. Write the balanced equation representing the chemical reaction that took place. 5. Pblz is a bright yellow solid that does not dissolve in water. What two solutions can be mixed that would result in a precipitate of Pbl2 being formed?

2 Why is the observation of an increase in temperature when two substances are mixed not absolute proof that a chemical reaction occurred? 3. When lead (II) nitrate and sodium sulfide are mixed a black solid precipitate is formed. What is the identity of that compound? 4. A solution of Hg(NO3)2 is mixed with a solution of KBr. Both of these solutions are colorless. A white precipitate forms. Write the balanced equation representing the chemical reaction that took place. 5. Pblz is a bright yellow solid that does not dissolve in water. What two solutions can be mixed that would result in a precipitate of Pbl2 being formed?

Chemistry
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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1. A sample of a solution is tested with red litmus paper. There is no color change. What is the correct INTERPRETATION of this observation? - why is the observation of an increase in temperature when two substances are mixed not absolute proof that a chemical reaction occurred? 3. When lead (II) nitrate and sodium sulfide are mixed a black solid precipitate is formed. What is the identity of that compound? 4. A solution of Hg(NO3)2 is mixed with a solution of KBr. Both of these solutions are colorless. A white precipitate forms. Write the balanced equation representing the chemical reaction that took place. 5. Pblz is a bright yellow solid that does not dissolve in water. What two solutions can be mixed that would result in a precipitate of Pbl2 being formed?
Transcribed Image Text:1. A sample of a solution is tested with red litmus paper. There is no color change. What is the correct INTERPRETATION of this observation? - why is the observation of an increase in temperature when two substances are mixed not absolute proof that a chemical reaction occurred? 3. When lead (II) nitrate and sodium sulfide are mixed a black solid precipitate is formed. What is the identity of that compound? 4. A solution of Hg(NO3)2 is mixed with a solution of KBr. Both of these solutions are colorless. A white precipitate forms. Write the balanced equation representing the chemical reaction that took place. 5. Pblz is a bright yellow solid that does not dissolve in water. What two solutions can be mixed that would result in a precipitate of Pbl2 being formed?
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