A compound can be treated like an element when balancing chemical equations when : A. when there is no change to the atoms in the compound
If they remain together during the reaction, you can treat a compound as a singe atom.
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Answer:
Fe is the limiting reagent
Explanation:
Answer:
CaCO₃ built up in hot water pipes
Explanation:
The hardness of water is classified as;
Permanent Hard Water:
In this the mineral content cannot be removed by boiling. This water contains mainly following,
Calcium Sulfate CaSO₄
Calcium Chloride CaCl₂
Magnesium Sulfate MgSO₄
Magnesium Chloride MgCl₂
These salts does not precipitate out on heating water.
Temporary Hard Water:
In this water the mineral content can be removed by boiling. This water contains mainly following,
Calcium Bicarbonate Ca(HCO₃)₂
Calcium Carbonate CaCO₃
Magnesium Bicarbonate Mg(HCO₃)₂
Magnesium Carbonate MgCO₃
These salts does not precipitate out on heating water. i.e.
Ca(HCO₃)₂ -------heat------> CaCO₃ + CO₂ + H₂O
The CaCO₃ are formed in the form of scales.
Result:
Hence, we can say that that CaCO₃ built up in hot water pipes.
Answer:
Mass of oxygen required = 19.5 moles × 16 g/mol = 312 g.
Explanation:
<h3>
Answer:</h3>
500 Joules
<h3>
Explanation:</h3>
<u>We are given;</u>
- Force is 100 N
- Distance is 5 m
We are required to calculate the work done;
- Work done is the product of force and distance.
- That is, work done = Force × distance
- Work is measured in Joules
Thus, in this case;
Work done = 100 N × 5 m
= 500 Joules
Thus, the work done in moving the box is 500 joules
