LAB REFLECTION: Observing Energy Changes in Reactions

Which reaction showed the biggest temperature increase?

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following is a sign that a chemical reaction happened?

• Bubbles formed

• Temperature changed

• The solution smelled sour

• The beaker changed shape

Tags

NGSS.MS-PS1-2

In an endothermic reaction, what happens to the temperature?

• It increases because heat is released

• It decreases because heat is absorbed

• It stays the same

• It changes depending on the reactants

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What could cause your data to show less temperature change than expected?

• You used the wrong thermometer

• The thermometer wasn’t fully in the liquid

• The solution was stirred constantly

• You waited too long to take the first measurement

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Two reactions bubbled. Does bubbling always mean heat is released?

• Yes, bubbling always means it's exothermic

• No, some reactions bubble but absorb heat

• Only acid-base reactions bubble

• Bubbling means the reaction is fake

Match each reaction to the energy change you observed.

• Endothermic

• • Citric acid + baking soda

• Exothermic

• • Calcium chloride + baking soda + water

• Endothermic

• • Calcium chloride + water

• Exothermic

• • Baking soda + vinegar

Tags

NGSS.MS-PS1-2

NGSS.MS-PS3-4