Homework Help is Here – Start Your Trial Now!
Science
Chemistry
E. A chemical change involves a change in the composition of matter-the formation of a new chemical substance (product) with physical and chemical properties different from those of the reactants. Describe the evidence used to decide if any of the processes in Part A were chemical changes. Did you observe any qualitative differences in the amount of heat generated in the reac- tions that were characterized as endothermic in Part A? Consider Reaction A: Was energy released or absorbed by the reactants in this system? When you touched the reaction container (the plastic bag) was energy being released or absorbed by your hand? Write a balanced equation for each of the processes in Part A. Remember to include heat on the reactant or product side, as appropriate.

E. A chemical change involves a change in the composition of matter-the formation of a new chemical substance (product) with physical and chemical properties different from those of the reactants. Describe the evidence used to decide if any of the processes in Part A were chemical changes. Did you observe any qualitative differences in the amount of heat generated in the reac- tions that were characterized as endothermic in Part A? Consider Reaction A: Was energy released or absorbed by the reactants in this system? When you touched the reaction container (the plastic bag) was energy being released or absorbed by your hand? Write a balanced equation for each of the processes in Part A. Remember to include heat on the reactant or product side, as appropriate.

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...
See similar textbooks
icon
Related questions
Question
To ensure that you are not confused, I attached what the experiment was about. I highly recommend you read through it before going to the questions. file:///Users/michaelzheng/Downloads/ExploringEnergy%20(2).pdf Only answer Post lab questions 2-5 For number five, put the answers in the format stated in the background. Thank you.
**Title: Exploring Energy Changes** **Data Table A: Observing Heat Changes** | Reaction | Solid + Liquid | Mass of Solid (g) | Observations | |-----------------------|---------------------|-------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------| | **A** | NH\(_4\)Cl(s) + H\(_2\)O(l) | 2.0269 | The solid completely dissolved and the solution was like an ice pack (abundant liquid). Temperature decreased. **Endothermic** (ENDO) | | **B** | CaCl\(_2\)(s) + H\(_2\)O(l) | 3.1644 | The solid dissolved with very little excess left behind. Temperature increased. **Exothermic** (EXO) | | **C** | NaHCO\(_3\)(s) + HCl(aq) | 1.2719 | Fizzy and bubbling occurred. The temperature was neutral. **Endothermic** (ENDO) | **Data Table B: Measuring Temperature vs. Time** - The table for Data Table B is present but not filled in. The headings include: Volume of Liquid (mL), Identity of Liquid, Mass of Solid (g), Identity of Solid, Assigned Reaction. - No data is recorded in these columns. **Explanation:** This document includes two data tables relating to an experiment on energy changes observed in chemical reactions. - **Data Table A:** Focuses on recording the heat changes (endothermic or exothermic) when a solid is dissolved in a liquid. Observations include the physical state, behavior of materials, and temperature changes. Each reaction is marked with whether it's endothermic or exothermic. - **Data Table B:** Designed for measuring temperature versus time but currently lacks recorded data. Columns are prepared to log the volume of liquid, identity of liquid, mass and identity of solid, and the assigned reaction.
Transcribed Image Text:**Title: Exploring Energy Changes** **Data Table A: Observing Heat Changes** | Reaction | Solid + Liquid | Mass of Solid (g) | Observations | |-----------------------|---------------------|-------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------| | **A** | NH\(_4\)Cl(s) + H\(_2\)O(l) | 2.0269 | The solid completely dissolved and the solution was like an ice pack (abundant liquid). Temperature decreased. **Endothermic** (ENDO) | | **B** | CaCl\(_2\)(s) + H\(_2\)O(l) | 3.1644 | The solid dissolved with very little excess left behind. Temperature increased. **Exothermic** (EXO) | | **C** | NaHCO\(_3\)(s) + HCl(aq) | 1.2719 | Fizzy and bubbling occurred. The temperature was neutral. **Endothermic** (ENDO) | **Data Table B: Measuring Temperature vs. Time** - The table for Data Table B is present but not filled in. The headings include: Volume of Liquid (mL), Identity of Liquid, Mass of Solid (g), Identity of Solid, Assigned Reaction. - No data is recorded in these columns. **Explanation:** This document includes two data tables relating to an experiment on energy changes observed in chemical reactions. - **Data Table A:** Focuses on recording the heat changes (endothermic or exothermic) when a solid is dissolved in a liquid. Observations include the physical state, behavior of materials, and temperature changes. Each reaction is marked with whether it's endothermic or exothermic. - **Data Table B:** Designed for measuring temperature versus time but currently lacks recorded data. Columns are prepared to log the volume of liquid, identity of liquid, mass and identity of solid, and the assigned reaction.
**Exploring Energy Changes: Page 6** **Post-Lab Questions** _Attach the printout of the data table and graph for Part B to your lab report._ 1. Complete the following Results Table to indicate whether each reaction in Part A represents a physical or chemical change and whether it is exothermic or endothermic. | Reaction | Physical or Chemical Change? | Exothermic or Endothermic? | |----------|------------------------------|-----------------------------| | A | Physical change | Exothermic | | B | Chemical change | Exothermic | | C | Chemical change | Endothermic | 2. A chemical change involves a change in the composition of matter—the formation of a new chemical substance (product) with physical and chemical properties different from those of the reactants. Describe the evidence used to decide if any of the processes in Part A were chemical changes. 3. Did you observe any qualitative differences in the amount of heat generated in the reactions that were characterized as endothermic in Part A? 4. Consider Reaction A: Was energy released or absorbed by the reactants in this system? When you touched the reaction container (e.g., the plastic bag) was energy being released or absorbed by your hand? 5. Write a balanced equation for each of the processes in Part A. Remember to include heat on the reactant or product side as appropriate. 6. In Part B, was the temperature that was measured a part of the system?
Transcribed Image Text:**Exploring Energy Changes: Page 6** **Post-Lab Questions** _Attach the printout of the data table and graph for Part B to your lab report._ 1. Complete the following Results Table to indicate whether each reaction in Part A represents a physical or chemical change and whether it is exothermic or endothermic. | Reaction | Physical or Chemical Change? | Exothermic or Endothermic? | |----------|------------------------------|-----------------------------| | A | Physical change | Exothermic | | B | Chemical change | Exothermic | | C | Chemical change | Endothermic | 2. A chemical change involves a change in the composition of matter—the formation of a new chemical substance (product) with physical and chemical properties different from those of the reactants. Describe the evidence used to decide if any of the processes in Part A were chemical changes. 3. Did you observe any qualitative differences in the amount of heat generated in the reactions that were characterized as endothermic in Part A? 4. Consider Reaction A: Was energy released or absorbed by the reactants in this system? When you touched the reaction container (e.g., the plastic bag) was energy being released or absorbed by your hand? 5. Write a balanced equation for each of the processes in Part A. Remember to include heat on the reactant or product side as appropriate. 6. In Part B, was the temperature that was measured a part of the system?
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps with 2 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Thermodynamics
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.
Similar questions
Recommended textbooks for you
Chemistry
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Organic Chemistry
Organic Chemistry
Chemistry
ISBN:
9780078021558
Author:
Janice Gorzynski Smith Dr.
Publisher:
McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
Chemistry
ISBN:
9781305079373
Author:
William L. Masterton, Cecile N. Hurley
Publisher:
Cengage Learning
Elementary Principles of Chemical Processes, Bind…
Elementary Principles of Chemical Processes, Bind…
Chemistry
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
SEE MORE TEXTBOOKS