Question

diffrenciate between the following 1. Physical change and chemical change.
2. Magnesium oxide and magnesium hydroxide.​

Answer 1

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• Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
• The key difference between magnesium oxide and magnesium hydroxide is that magnesium oxide has an oxide anion per one magnesium cation, whereas magnesium hydroxide has two hydroxide anions per one magnesium cation.

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Answer 2

ANSWER:

Difference between Physical change and chemical change

$\star\;{\underline{\underline{\sf{\pink{Physical \;change:}}}}}$

• Physical changes only change the looks of a substance, not its chemical composition.
• Physical changes produce no energy.
• For example: Change of ice into water.

$\star\;{\underline{\underline{\sf{\pink{Chemical\;change:}}}}}$

• Chemical changes cause a substance to vary into a completely different substance with a replacement formula.
• Chemical changes are also referred as chemical reactions where left side of reaction is reactant and right side of reaction is known as product. The arrow represent the direction of reaction.
• Chemical changes produce energy generally in the form of heat, light or sound.
• For example: Change of burned wood into ash.

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Difference between Magnesium oxide and Magnesium Hydroxide

$\star\;{\underline{\underline{\sf{\purple{Magnesium\; oxide:}}}}}$

• Magnesium oxide is a compound having chemical formula MgO.
• It contains Magnesium (Mg) and Oxygen (O) atoms.
• Molar mass of magnesium oxide is 40.304 g/mol.
• It is highly soluble in water.
• It gives magnesium hydroxide upon dissolution.

$\star\;{\underline{\underline{\sf{\purple{Magnesium\; Hydroxide:}}}}}$

• Magnesium hydroxide is a compound having chemical formula $\bf Mg(OH)_2$.
• It contains Magnesium (Mg), Oxygen (O) and Hydrogen (H) atoms.
• Molar mass of Magnesium Hydroxide is 58.32 g/mol.
• It is poorly soluble in water.
• It is also know as Milk of Magnesia.