Answer to question 5 is whatever expertnent you did in class.
Answer:
4.5 kilograms of silicon dioxide is required to produce 3.00 kg of SiC.
Explanation:
The balanced equation for the reaction between silicon dioxide and carbon at high temperature is given as:

1 mole silicon dioxide reacts with 3 moles of carbon to give 1 moles of silicon carbide and 2 moles of carbon monoxide.
Mass of SiC = 3.00kg = 3000.00 g
1 kg = 1000 g
Molecular mass of SiC = 40 g/mol
Moles of SiC = 
According to reaction, 1 mole of SiC is produced from 1 mole of silicon dioxide.
Then 75 moles of SiC will be produce from:
of silicon dioxide.
mass of 75 moles of silicon dioxde:

4.5 kilograms of silicon dioxide is required to produce 3.00 kg of SiC.
When earth turns once it's a day
<span>Ans- bond with the highest bond energy is for ( C=C \rightarrow 620 (kJ/mol)
N=N \rightarrow 418 (kJ/mol)
Si=O \rightarrow 452 (kJ/mol)
O=O \rightarrow 498.7 (kJ/mol)
C=N \rightarrow 615 (kJ/mol)
C=C \rightarrow 620 (kJ/mol)</span>
I'm pretty sure (C) Nitrogen is a compound.