Chemical and Physical Changes in Experiments

Dr. Jeff Viniker explores the science of chemical and physical changes. He demonstrates a physical change using a gallium spoon that melts in hot water but remains the same substance. He then shows a chemical change with vinegar and baking soda, creating a new substance and inflating a balloon. Another experiment involves burning gummy candy in an oxidizer, resulting in new chemicals. Dr. Viniker provides instructions for a DIY chemical change experiment using vinegar and baking soda. The video concludes with a recap of the experiments and a reminder of the differences between chemical and physical changes.

What is a physical change?

• A change that cannot be reversed

• A change that forms new substances

• A change that alters the state of matter without forming new substances

• A change that involves a chemical reaction

What happens to gallium when it is placed in hot water?

• It evaporates

• It forms a new substance

• It remains solid

• It melts but remains the same substance

What is the result of mixing vinegar and baking soda?

• The mixture freezes

• The substances remain unchanged

• A new substance is formed

• A physical change occurs

What is the purpose of the oxidizer in the gummy candy experiment?

• To dissolve the candy

• To cool the candy

• To change the candy's color

• To provide oxygen for burning

What happens to the gummy candy in the oxidizer?

• It becomes a gas

• It melts without changing

• It forms new chemicals

• It remains unchanged

What materials are needed for the home experiment with vinegar and baking soda?

• Vinegar, baking soda, and a balloon

• Milk, flour, and a bowl

• Oil, sugar, and a cup

• Water, salt, and a spoon

What is the expected outcome when vinegar and baking soda are mixed in a balloon?

• The balloon deflates

• The balloon inflates

• The balloon changes color

• The balloon remains unchanged

What is the main difference between chemical and physical changes?

• Physical changes form new substances, chemical changes do not

• Chemical changes form new substances, physical changes do not

• Neither change forms new substances

• Both changes form new substances

What was the physical change experiment demonstrated in the video?

• Mixing vinegar and baking soda

• Inflating a balloon

• Burning gummy candy

• Melting a gallium spoon

What should you avoid doing with gummy candy according to the video?

• Freezing it

• Burning it

• Eating it

• Melting it