1. Watch the provided video on chemical and physical changes
2. Create a post sharing your:
   • Key observation from the video
   • Question about something you didn’t understand
   • Connection to real-world examples
3. You may include a screenshot from the video to support your post
4. Read your classmates’ posts and comment on at least two

Remember the key differences:

• Physical changes : Shape or state changes, but substance remains the same
• Chemical changes : New substances form with different properties

Physical change - relates to size, form and shape changes

Chemical change - mostly involves explosion, color changes and temperature change

Question: Why is coke and mento explosion a physical change?

Connection to world: Hair cutting as a physical change example and iron rusting as a chemical one.

I learned that there are two types of changes, chemical change and physical change.

Chemical change is when a substance transform into a completely new substance, while physical is when an object's size, shape, or state changes.

For example, ice melting is physical change because the state changed from solid to liquid. Burning wood is an example of chemical change, because it forms new substances like carbon dioxide.

Chemical changes: electrons are change and new substance form ex.temperature and explode

• mix hydrogen gas and flame

Physical changes: change when matter changes form and not from identity ex.size shape changes.

• cutting hair, folding, and breaking (changes the size and shape)

What i felt really puzzled was why was diet coke and mentos fusing together would be a physical change instead of chemical change.

Real life example: chopping down a wood and splitting the wood would be a physical change

Key observation: Physical change only change the size, shape and phase, the chemical identities will not been change. And the chemical change will change the amount of the electrons of the elements and create a new substance.

Real world example: We will freeze the water to make ice to make our drinks cool down, this is a physical change. When we are playing the fireworks, this is a chemical change.

properties of the object involved.

The phase change confuses me a bit.

A real world example include dry powder fire extinguishers. A dry powder fire extinguisher contains CaCO3, which when burned creates CaO and CO2, and CO2 stops the combustion.

How do fireworks work?

Cooking is a chemical change because new substances are formed

At the start of the video, I thought when you put mentos and coke together it creates a chemical change, but instead it is physical because it dissolve carbon dioxide rather the creating a new substances.

I was confused about how would the coke and mentos mix be a physical change, when the coke reacts to the mentos by expanding in size. One example is the explosion resulting in different patterns and colors of a firework.

Chemical change is a new substance will different properties will be formed.such as burning the wood.

chemical change (Electrons are exchanged and a new substance is created.)

physical change is 100% caused by humans right?

If the change only includes the appearance

Note that Ice melting is a physical change.

• matter changes in the forms

• size, shape, and phase change

Chemical Changes

• electrons are exchanged

• new substance is created

• change in temperature or explosion

Question

• Is there an example that involve both chemical and physical change?

Connection to Real-World Examples

• Chemical Changes: baking a cake

• Physical Changes: melting ice

Physical change in size and shape. 

Chemical change includes changes in color, temperature, and explosion. Chemicals also create new chemical substances, while physical changes only change the state or appearance of the substance.

Question: Why does Coke add Mentos is a physical change?

Real-world examples: Physical change: evaporation. Chemical change: fireworks

Physical change - change in size and shape

Chemical change - change in color, temperature, and explosion

Question: Does burning a candle count as a chemical change or a physical change?

Connection to real-world: 

Physical change: hair cutting

Chemical change: firework