Answer: 1. 
2. 
3. 
4. 
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The given equations are balanced as:
1.
2.
3.
4.
Hence Mg has 10 core electrons and 2 valence electrons. The number of core electrons depends on the period (row) in which the element is found.
<span>i think its B. Skier 1 will have more potential energy.</span>
No as oxygen is not balance
In reactants side there is 12 oxygen and in the product side there is 8 oxygen
Answer:Chromatography technique that uses paper sheets or strips as the adsorbent being the stationary phase through which a solution is made to pass is called paper chromatography. It is an inexpensive method of separating dissolved chemical substances by their different migration rates across the sheets of paper.
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