Endothermic Reaction

The video explains exothermic and endothermic reactions, focusing on an endothermic reaction demonstration using barium hydroxide and ammonium thiocyanate. The setup involves a digital thermometer and a beaker on a wet piece of wood. As the reaction proceeds, the temperature drops significantly, illustrating energy absorption from the surroundings. The video details the chemical process, emphasizing bond formation and breaking, and concludes with the reaction's impact on temperature, causing the beaker to freeze to the wood.

What is the main difference between exothermic and endothermic reactions?

• Exothermic reactions release energy, while endothermic reactions absorb energy.

• Both exothermic and endothermic reactions release energy.

• Both exothermic and endothermic reactions absorb energy.

• Exothermic reactions absorb energy, while endothermic reactions release energy.

Which materials are needed to demonstrate an endothermic reaction in the video?

• Sodium chloride, water, a digital thermometer, and a piece of metal.

• Ammonium thiocyanate, water, a digital thermometer, and a piece of metal.

• Hydrated barium hydroxide, ammonium thiocyanate, a digital thermometer, and a piece of wood.

• Hydrated barium hydroxide, sodium chloride, a digital thermometer, and a piece of wood.

What is the initial temperature of the two powders used in the endothermic reaction?

• 50°C

• 22.4°C

• 0°C

• 100°C

What happens to the temperature during the endothermic reaction?

• It remains constant.

• It increases slightly.

• It drops significantly.

• It fluctuates randomly.

What is formed when barium hydroxide and ammonium thiocyanate react?

• Barium thiocyanate, water, and ammonia gas

• Ammonium chloride and water

• Barium sulfate and ammonia gas

• Barium chloride and water

Why does the beaker freeze to the wood during the experiment?

• Because the wood absorbs heat from the beaker.

• Because the beaker releases heat to the surroundings.

• Because the endothermic reaction absorbs heat, causing the water to freeze.

• Because the beaker is made of a special material that freezes easily.

In an endothermic reaction, what happens to the energy dynamics of chemical bonds?

• The energy remains unchanged.

• More energy is absorbed than released.

• More bonds are formed than broken.

• More energy is released than absorbed.