Experiment To Study The Exothermic And Endothermic Reactions 4w6oy

To study the exothermic and endothermic reactions Science Experiment 5.3 PEKA Evaluation 20092010 15 September 2009

Azneezal ArRashid Smk Sri Aman 95007 Sri Aman, Sarawak

Aim • To study the exothermic reaction and endothermic reaction

Problem statement • How can exothermic reaction and endothermic reaction can be identified

Hypothesis • Exothermic reaction releases heat, while endothermic reaction absorbs heat

Variable • Constant

:

– Initial temperature

• Manipulated : – Types of material • Sodium Hydroxide Crystals • Ammonium Chloride Crystals • Sodium Chloride Crystals

• Responding : – Final temperature

Materials • 1 spatula of – Sodium Hydorixe crystals (Beaker A)

• 1 spatula of – Ammonium Chloride crystals (Beaker B)

• 1 spatula of – Sodium Chloride crystals (Beaker C)

• Distilled water

Apparatus • 3 Beakers • 1 thermometer • 3 spatulas

Procedure/Method • About 20 ml of distilled water is poured into a beaker • The initial temperature of the distilled water is recorded • A spatula of Sodium Hydoxide Crystals is added in the beaker • The mixture is stirred • The final temperature is recorded • The experiment is repeated using Ammonium Chloride Crystals and Sodium Chloride Crystals

Results/Observation Table Material

Initial temperature

Final temperature

Change in temperature

Outer wall of beaker

Sodium Hydroxide Crystals + Distilled Water

___ C

___ C

___ C

Hot/Cold/ No Reaction

Ammonium Chloride Crystals + Distilled Water

___ C

___ C

___ C

Hot/Cold/ No Reaction

Sodium Chloride Crystals + Distilled Water

___ C

___ C

___ C

Hot/Cold/ No Reaction

Conclusion • Exothermic reaction causing the temperature of the solution to increase/decrease • Endothermic reaction causing the temperature of the solution to increase/decrease • The hypothesis can/cannot be aceted

• • • • • • • • • •

Sodium hydroxide (exothermic reaction) Sodium hydroxide (exothermic reaction) Sodium hydroxide (exothermic reaction) Sodium hydroxide (exothermic reaction) Sodium hydroxide (exothermic reaction) Sodium hydroxide (exothermic reaction) Sodium hydroxide (exothermic reaction) Sodium hydroxide (exothermic reaction) Sodium hydroxide (exothermic reaction) Sodium hydroxide (exothermic reaction)

• Ammonium chloride (endothermic reaction) • Ammonium chloride (endothermic reaction) • Ammonium chloride (endothermic reaction) •

Ammonium chloride (endothermic reaction)