Answer:- 
Explanations:- Let's say the first molecule is A and the second molecule is B and the product molecule is C.
From given information, 2 molecules of A react with 3 molecules of B to produce 5 molecules of C.
We write the reactants on left side and the product on right side and there is an arrow between them from reactants towards the products.
So, the reaction could be represented as:

Answer:
A. 1613 °C
Explanation:
The asthenosphere is located just below the Earth’s crust.
It must be molten or semi-molten, so that convection currents can move the tectonic plates above it.
Rocks start to melt at about 1300 °C, so a temperature of 1613 °C sounds about right.
Answer:
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Explanation:
here is an attached photo with a detailed explanation, good luck!
Answer:
a
They form an ionic bond by exchanging two electrons.
Explanation:
Magnesium loses two electrons and oxygen gains these electrons so ionic bond is formed