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Watch and Respond

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

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Examples of Physical and Chemical Changes ( Updated )

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Key observation:

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.

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chemistry is the scientific study of matter and its transformations, also reactions and interactions

Physical changes includes alteration in state or shape

Chemical changes result in formation of new substances with different properties

Is there any example of a chemical change that has a significant impact on society?

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Physical Changes

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

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You could focus on "science" or "daily life".

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The key difference between physical and chemical change is whether the substance's electron is exchanged or whether it is only the shape, size. I was a little confused since I thought the fireworks were physical change that chemicals came out. However, I understood that it is the explosion and temperature that causes it to change color and show fireworks.

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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.

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Physical change matters but not identity. Chemical exchange the electrons and create new substances. For example, hair cutting is a physical change and mixing acid and a base is a chemical change. Questions: Is the burning of the candle a chemical change?

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2-Physical change includes changing shape and size while chemical reaction is when a new substance is created. Melting ice in the freezer doesnt create a new substance. It just changes the state of the ice so it is physical. When you fry an egg you create a new substance so it is chemical. Ethan Chen

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1. Physical change is when the substance's shape or state changes while the substance still remain the same. Chemical change involves different properties that could cause the substance to shift. 2.The procedure of chemical changes confuses me slightly. 3.Physical change-ice cubes, chemical change-fireworks.

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physical change ( When matter changes forms but not chemical identity: shapes, size and phase changes

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

physical change is 100% caused by humans right?

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I learn the two types of changes from the video

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)

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The video mainly compares about the difference and the main changes between physical change and chemical change. Instances such as breaking a piggy bank and putting a chemical into water to trigger explosion was used in the video.

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

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Michelle

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.

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The key observation of this video is the differences between physical changes and chemical changes. Physical changes only affect the state or appearance of the substance, while chemical changes create new substances.

How do fireworks work?

Cooking is a chemical change because new substances are formed

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The video shows the differences between physical changes and chemical changes. Physical changes requires by size changes, shape, and cold temperature. For chemical changes to happens, it requires explosion and temperature rising. Such as fireworks. Fireworks creates explosion with high temperature which perfectly fits the requirements for chemical changes to happen.

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.

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The physical changes are the changes that only affect their physical aspects, for example, shape and color. The chemical changes are the change in the substance, which is a whole different thing from the beginning. One of the real-life problems for chemical changes is baking a cake. The example of the physical changes is a broken table.

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The video shows that the difference between physical and chemical change is that physical change is caused by outside forces that do not alter the component in a molecular level, it can be reversed and its components could be extracted, while chemical change couldn't and is caused by multiple materials mixing causing the molecules to come in contact with each other and result in a reaction, its result could not be altered back into its original form.

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.

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Physical change usually relate to the changes of size or shape. The chemical changes usually relate on the changes of substances, such as explosion and temperature changes. I questioned about the firework at first, but after he explain the changes of temperature and color that cause by the firework, I understood.

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Key observation: Differences, properties, and examples of physical and chemical changes. physical changes: A change in the appearance, shape, or state of a substance while its composition remains don’t change. Example: glass broken. chemical changes: A change in the nature of matter, producing a new substance that is different from the original. Example: rust, Firefly glow. Question: I am not sure if the glow of a light bulb is a physical change or a chemical change?

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The video shoes the difference between physical and chemical changes.Physical change is the form of substances change, but its identity will be the same.For example, the ice melting into water.

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

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1. Physical change is a change of form or shape, but the chemical identity remains.

Chemical Change is when a substance reacts with other substances and creates a new substance.

2. Is creating fire is physical change or a chemical change?

3. Cooking food is a physical change. Food only changes in form, but doesn't create new substance

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If the substance's property changes or gets converted into another material then it is related to chemical change.

If the change only includes the appearance

Note that Ice melting is a physical change.

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key observation : physical change change in size or shape, but not the chemical identity, for example ice melting or cutting hair. Chemical change is electrons being exchanged or new things are created. Some examples for physical change is shredding papers or hot water turning into steam. Examples for chemical change is digesting milk or burning candles.

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In this video, several traits and differences are shown between physical changes and chemical changes. A physical change will not affect the type of and object, but rather change the shape and phase. On the other hand, an chemical change involves reactions that change the

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.

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Key Observation:

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

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Key observation:

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