Recognizing Chemical Reactions

The video tutorial explains chemical reactions, which involve substances changing chemically into different substances. It highlights clues to identify these reactions, such as color change, gas emission, heat, and light production. Examples include frying an egg, burning wood, and activating a glow stick.

What is another term used to describe a chemical change?

• Chemical reaction

• Biological process

• Mechanical alteration

• Physical transformation

Which of the following is a clue that a chemical reaction is occurring when frying an egg?

• The egg emits a sound

• The egg changes color

• The egg becomes solid

• The egg releases a smell

What happens when you drop certain tablets in water?

• They dissolve silently

• They emit light

• They change color

• They bubble and release gas

Which of the following is an example of heat being given off during a chemical reaction?

• A glow stick being activated

• Wood burning

• A tablet dissolving in water

• An egg frying

What is produced when a glow stick is activated?

• Heat

• Gas

• Sound

• Light