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Endothermic and Exothermic Reactions

Figure from experiment 5 from Physical Science with Vernier

Introduction

Some chemical reactions absorb energy and are called endothermic reactions. Many chemical reactions give off energy. Chemical reactions that release energy are called exothermic reactions. You will study one endothermic reaction and one exothermic reaction in this experiment.

In Part I, you will study the reaction between citric acid solution and baking soda. An equation for the reaction is

{{\text{H}}_{\text{3}}}{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{5}}}{{\text{O}}_{\text{7}}}{\text{(aq)  +  3 NaHC}}{{\text{O}}_{\text{3}}}{\text{(s)}} \to {\text{3 C}}{{\text{O}}_{\text{2}}}{\text{(g)  +  3 }}{{\text{H}}_{\text{2}}}{\text{O(l)  +  N}}{{\text{a}}_{\text{3}}}{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{5}}}{{\text{O}}_{\text{7}}}{\text{(aq)}}

In Part II, you will study the reaction between magnesium metal and hydrochloric acid. An equation for this reaction is

{\text{Mg(s)  +  2 HCl(aq)}} \to {{\text{H}}_{\text{2}}}{\text{(g)  +  MgC}}{{\text{l}}_{\text{2}}}{\text{(aq)}}

Objectives

In this experiment, you will

  • Observe two chemical reactions.
  • Measure temperature changes.
  • Determine the change in temperature, Δt, for each of the reactions.
  • Identify endothermic and exothermic reactions.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Option 1

Option 2

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Physical Science with Vernier »

Experiment 5 from Physical Science with Vernier Lab Book

<em>Physical Science with Vernier</em> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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