Chemistry
Grade-8
Easy
Question
According to the Law of Conservation of Mass, what will happen, if the wood and oxygen is burned?
- The wood will disappear
- There are no chemical change takes place
- It stays the same chemically
- Smoke and ash will be formed with same mass of wood and oxygen.
Hint:
Mass can neither be created nor destroyed.
The correct answer is: Smoke and ash will be formed with same mass of wood and oxygen.
- The regulation of conservation of mass states that energy can not be created or destroyed in a chemical response. For example, while timber burns, the mass of the soot, ashes, and gases equals the unique mass of the charcoal and the oxygen while it first reacted.
- So the mass of the product equals the mass of the reactant. A reactant is a chemical response of extra factors to make a brand new substance, and a product is a substance this is shaped because the end result of a chemical response
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While verifying the law of conversation of mass, Ron added 4.5 g of magnesium metal to 15.5 g of hydrochloric acid. If mass of the magnesium chloride formed is 16.9, what is the mass of eliminated hydrogen gas if the law of conservation of mass is valid for this change.
Mg + 2HCl → MgCl2 + H2↑
While verifying the law of conversation of mass, Ron added 4.5 g of magnesium metal to 15.5 g of hydrochloric acid. If mass of the magnesium chloride formed is 16.9, what is the mass of eliminated hydrogen gas if the law of conservation of mass is valid for this change.
Mg + 2HCl → MgCl2 + H2↑
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