Identify 3 physical changes that could occur with a sheet of paper
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This Post Has 8 Comments
Option (1) is the correct answer.
Chemical changes are defined as the changes which tend to show difference in chemical composition of a substance.
For example, toxicity, reactivity, combustion etc are all chemical changes.
In a chemical change, there will always be formation of a new compound.
On the other hand, a change which is unable to bring any difference in chemical composition of a substance is known as a physical change.
For example, a change in shape, size, mass, volume etc are all physical changes.
Thus, we can conclude that when one substance changes into one or more new substances, it has exhibited a chemical change.
becuase the sugar disolves into the coffe.
sorry if its wrong 🙂
sedimentary drop off (PC) a rock being broken in half (PC) a piece of candy being ate (PC) A chemical reaction (CC) cooked pizza (CC) lava burning a rock (CC) used fuel (CC)
1. Dimensions: The sheet can be cut into several smaller pieces.2. Shape: the sheet can be formed into a paper ball or any other shape (using origami for example).3. Color: You can use crayons to paint the sheet and change its color.
Physical changes do not change the chemical properties. They do not transform the compounds that form the substances. They do not break and or form chemical bonds.
When you change the form, the state (solid, liquid or gas), the color, you are just changing physical properties.
Only chemical changes change the compounds that form the substance. For instance, if you burn the sheet of paper, then you are causing a chemical change because the organic matter in the paper will react with oxygen forming CO₂ and water, but by cutting, folding, smashing, or coloring with crayons, the compounds in the sheet of paper do not change.
3. Physical change because compressibility is a physical property.
The type of change that takes place here is a physical change because compressibility is a physical property.
Gases are compressible when pressure is applied to them. This ensures that they are more closely packed together.
When pressure is removed they expand and become random matter.
An air bag utilizes this property of gases to function. On impact, the pressure in the bag is released and gases rapidly expands to fill it up. This is a simple physical change. A physical change is one that changes the state of matter especially the form. No new kinds of matter are formed. In the air bag, this is true.
-changes in color
-bubbling, smoking, etc.
The answer is 1. chemical change.
That is when one substance changes into one or more new substances, it has exhibited a chemical change.
A Chemical change is a change that takes places when a substance changes its composition by forming one or more new substances. As here also, one substance is changing into one or more new substance, thus it exhibits a chemical change.
3 physical changes:
1.Ice melting involves a change from a solid to a liquid and the substances maintain the properties of water because the molecules never change.
2.Water boiling is a physical change as water molecules vibrate faster, they enter the gas phase and become water vapor.
3.Rubbing alcohol left uncovered will evaporate quickly into the air. It turns to a gas but maintains the properties of alcohol.
4 chemical changes:
iron rusting (iron oxide forms)gasoline burning (water vapor and carbon dioxide form)eggs cooking (fluid protein molecules uncoil and crosslink to form a network)bread rising (yeast converts carbohydrates into carbon dioxide gas)