July 5, 2025

What happens when wood undergoes burning?

• It freezes into ice

• It grows new roots

• It becomes softer

• It forms smoke and ash

Which activity shows a chemical reaction?

• Folding a cloth napkin

• Cooling liquid water

• Mixing sugar in tea

• Combining vinegar and baking soda

What is produced in a chemical reaction?

• The same material

• A louder sound

• A new shape only

• A completely new substance

What property involves light and heat production?

• Conductivity

• Flexibility

• Solubility

• Combustibility

What material is most likely degradable over time?

• A sealed glass jar

• A plastic table mat

• A metal fork

• A sheet of newspaper

Which causes degradation in materials?

• Sound from speakers

• Pressure from traffic

• Weight from stacking

• Heat and sunlight

How does biodegradable waste break down?

• With strong wind

• Through heavy rain

• Using sharp tools

• By action of living organisms

Which item is biodegradable?

• Plastic water bottle

• Metal coin

• Clear window glass

• Banana peel

Why is rotting food a chemical change?

• It melts slowly

• It gets bigger

• It smells nice

• It changes into new matter

Which is a chemical reaction?

• Chilling fruit juice

• Freezing ice cream

• Cutting a soft cake

• Bubbling vinegar with baking soda