Excellent quiz by Noah and Afshin

Why is stretching a rubber band an example of reversible change

• The stretching of a rubber band is a reversible change because after we leave the rubber band it gets back to its orginal shape

• I dont know im dumb

• The stretching of a rubber band is a irreversible change because after we leave the rubber band it doesn't gets back to its orginal shape

• The stretching of a rubber band is not reversible nor irreversible it is nothing

Wet clothes to (a)   clothes is reversible

Which takes more time to change[like 260 days]

(a)  

What is a thing called which cannot be reversed

• reversible

• I forgot

• Irreversible

• Roblox

Which of these are the slowest changing

• 
• 
• 
• 

Give five examples of reversible changes

• Melting ice, evaporating water, dissolving sugar, inflating a balloon, stretching a rubber band
• Boiling water, burning paper, cutting a piece of paper, breaking a glass, cooking an egg
• Freezing water, deflating a balloon, tearing a piece of paper, burning wood, cooking pasta
• Condensing steam, dissolving salt, breaking a pencil, burning coal, cooking rice

What do u mean by reversible changes

• Changes that cannot be undone or reversed
• Changes that can be reversed

• Changes that are unpredictable
• My dog ate my book so I couldn't study

When we draw something with a pencil. Can you reverse this change?

• Yes

• Maybe
• No
• My mom slapped me to North Korea so I couldn't study

A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?

• 
• 
• Sometimes
• 

Which is a way to make change happen?

• (a) Heating a substance

• (b) Cooling a substance

• (c) Mixing a substance

• (d) All of these

• While pooping I fell into my closet and was stuck in it so I couldn't study