Endothermic/Exothermic LAB

The reaction of sodium bicarbonate and acetic acid is exothermic or endothermic? What evidence do you have?

• The reaction is endothermic.
• The reaction produces gas only.
• The reaction is exothermic.
• The reaction has no temperature change.

Tags

NGSS.HS-PS1-4

The reaction of water and ammonium chloride is exothermic or endothermic? What evidence do you have?

• The reaction is exothermic.
• The reaction is endothermic.
• The reaction has no temperature change.
• The reaction produces gas.

The reaction of magnesium sulfate and water is exothermic or endothermic? What evidence do you have?

• The reaction of magnesium sulfate and water has no temperature change.
• The reaction of magnesium sulfate and water is exothermic.
• The reaction of magnesium sulfate and water is endothermic.
• The reaction of magnesium sulfate and water produces gas.

The reaction of calcium chloride and water is exothermic or endothermic? What evidence do you have?

• The reaction of calcium chloride and water has no temperature change.
• The reaction of calcium chloride and water is exothermic.
• The reaction of calcium chloride and water is neutral.
• The reaction of calcium chloride and water is endothermic.

Calcium chloride is as an ice-melting compound on sidewalks and city streets. Explain what is happening (use one of the terms-exothermic or endothermic in your explanation).

• Calcium chloride does not affect ice melting.
• The process is exothermic.
• The process is neutral and has no temperature change.
• The process is endothermic.

Tags

NGSS.HS-PS3-4

Does the energy go from the surrounding to the chemicals or from the chemicals to the surroundings in an exothermic reaction?

• Energy goes from the surroundings to the chemicals.
• Energy goes from the chemicals to the surroundings in an exothermic reaction.
• Energy is neither created nor destroyed in an exothermic reaction.
• Energy is absorbed by the chemicals in an exothermic reaction.

Tags

NGSS.HS-PS3-4

NGSS.HS-PS3-1

Define endothermic and exothermic in your own words.

• Endothermic reactions absorb heat, while exothermic reactions release heat.
• Endothermic reactions are faster than exothermic reactions.
• Endothermic reactions occur in cold environments, while exothermic reactions occur in hot environments.
• Endothermic reactions release heat, while exothermic reactions absorb heat.

Tags

NGSS.HS-PS3-4

Classify each of the following as an exothermic or endothermic process.

Groups:

(a) Melting ice cubes

,

(b) Baking Bread

,

(c) Burning a candle

,

(d) Splitting a gas molecule apart

• Results in the formation of soot

• Phase change from gas to smaller gas molecules

• Results in a decrease in temperature

• Exothermic

• Dough rises due to carbon dioxide produced by yeast

• Requires energy input to break covalent bonds

• Absorbs heat from the surroundings

• Emits carbon dioxide and water vapor

• Requires energy input to break intermolecular forces

• Bread is baked at high temperatures to create a golden crust

• Produces light and heat

• Commonly used in industrial processes

• Phase change from solid to liquid

• Yeast is activated by warm water and sugar

• Endothermic

• Results in the formation of smaller molecules

• Exothermic

• Bread crust forms due to Maillard reaction

• Gluten forms when water is added to flour

• Chemical reaction between wax and oxygen

Tags

NGSS.HS-PS3-4

NGSS.HS-PS1-4