Chemistry Q4 Extra Credit

• -200 KJ

• 200 KJ

• 400 KJ

• -300 KJ

How much activation energy is needed for this reaction?

• 300 KJ

• 500 KJ

• 400 KJ

• 100 KJ

What type of reaction is this?

• Exothermic

• Endothermic

• Cannot be determined
  

When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?

• Endothermic

• Decomposition

• Exothermic

• Indothermic

If less heat energy is released in making bonds in the products than is taken in when breaking bonds in the reactants, then the reaction is

• Endothermic

• Exothermic

• Cannot be determined

Is photosenthysis an Exothermic or an Endothermic reaction?

• Endothermic
• Exothermic

How does heat flow?

• Always from cold to warm
• Always from warm to cold
• Both warm to cold & cold to warm
• It depends on the temperature

How many Joules of energy are required to make 100 grams of ice at 0 C completely melt?

• 200 J
• 400 J
• 30,000 J
• 2,000,000 J

Copper, Brass, Carbon Steel, and Zinc were all heated with equal amounts of energy. Based on the chart, which material would experience the smallest temperature change?

• Copper

• Carbon Steel

• Zinc

• Brass

There are 2 pans of water, one containing 100 mL and the other containing 1000mL. If you add 4000 joules of energy to each pan, which one has the bigger change in temperature?

• 100 mL

• 1000 mL

• They both contain water, so they both have the same temperature change