Evidences of Chemical Reactions in Fun Experiments

Mr. Springer demonstrates four evidences of chemical reactions: gas formation, energy change, color change, and precipitate formation. Using vinegar and baking soda, he shows gas formation and a temperature drop. Iron chloride and potassium thiocyanate illustrate color change, while cobalt nitrate and sodium hydroxide demonstrate precipitate formation. Each experiment highlights a different evidence of chemical change.

What is the main topic of Mr. Springer's video?

• Properties of acids and bases

• Periodic table trends

• Evidences of chemical reactions

• Types of chemical bonds

What evidence of a chemical reaction is demonstrated by the bubbling in the vinegar and baking soda experiment?

• Formation of a solid

• Change in color

• Change in temperature

• Formation of a gas

During the vinegar and baking soda reaction, what happens to the temperature?

• It increases

• It fluctuates

• It remains constant

• It decreases

What is observed when potassium thiocyanate is added to iron 3 chloride?

• The temperature rises

• An unexpected color change occurs

• The solution becomes colorless

• A precipitate forms

What color change is observed when potassium thiocyanate is added to iron 3 chloride?

• From rusty to redder orange

• From red to yellow

• From blue to green

• From clear to pink

What happens to the cobalt nitrate solution when sodium hydroxide is added?

• It becomes clear

• It turns blue and forms a precipitate

• It evaporates

• It remains pink

What is the initial color of the cobalt nitrate solution before adding sodium hydroxide?

• Blue

• Pink

• Green

• Yellow

Which of the following is NOT an evidence of a chemical reaction?

• Formation of a gas

• Unexpected color change

• Dissolution of a solid

• Change in energy

What is the fourth evidence of a chemical reaction mentioned in the video?

• Formation of a gas

• Change in energy

• Unexpected color change

• Formation of a precipitate

Which evidence of a chemical reaction involves a temperature change?

• Formation of a gas

• Change in energy

• Unexpected color change

• Formation of a precipitate