Answer:
In physical change only the physical properties like shape will change and chemical compositions remains same while in chemical change, chemical reaction takes place and the whole composition of that matter get changed.
Explanation:
Physical Change
The changes that occur only due to change in shape or form but their chemical or internal composition remain unchanged.
These changes were reversible.
They have same chemical property.
These changes can be observed with naked eye.
Example
Water converting to Ice.
Water converting to gas.
In this water molecule remain the same, only they rearrange themselves that change its state of mater not composition
Chemical:
The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.
These changes are irreversible.
These changes occur due to chemical reactions.
These may not be observed with naked eye.
Example:
Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood
Boiling of egg: that change the chemical composition of protein in the egg
The reaction of Hydrogen and oxygen:
H 2 (g) + O 2 (g) -------------> 2H 2O (l)
Answer:
a substance made by mixing other substances together.
Explanation:
Answer:
n₂ = 31 mol
Explanation:
Given data:
Initial volume of gas = 6.2 L
Initial number of moles of gas = 19.2 mol
Final number of moles = ?
Final volume of gas = 10.0 L
Solution:
Formula:
V₁/n₁ = V₂/n₂
V₁ = Initial volume
n₁ = Initial number of moles
V₂ = Final volume
n₂ = Final number of mole
Now we will put the values.
6.2 L /19.2 mol = 10.0 L / n₂
n₂ = 10.0 L× 19.2 mol /6.2 L
n₂ = 192 L.mol /6.2 L
n₂ = 31 mol
The forces that act on the blocks as they descend the ramp are;
- Weight of the block
- Reaction force on the block
- Applied force
- Frictional force
<h3>What is force?</h3>
Force is that which is able to produce a push or a pull. Force causes an object to move from one point to another. For the body that is moving down the ramp there are four forces that act on it;
- Weight of the block
- reaction force on the block
- Applied force
- Frictional force
The weight of the block moves it downwards, the reaction force moves the block upwards, the applied force moves the block forward while the fricional force opposes the forward movement of the block.
Learn more about forces: brainly.com/question/3121416