Select the correct answer. What is the chemical name of the covalent compound P4O9? A. tetraphosphorus nonaoxygen B. tetraphosph
1 answer:
Answer : The correct option is D.
Explanation :
<u>The rules for naming of binary molecular compound :</u>
In the given formula, the lower group number element is written first in the name and keep its element name and the higher group number is written second.
First element in the formula is named first and keep its element name.
- Gets a prefix if there is a subscript on it such as mono for 1, di for 2, tri for 3 and so on.
Second element is named second.
- Use the root of the element name, if it is an anion then use suffix (-ide).
- Always use a prefix on the second element such as mono for 1, di for 2, tri for 3 and so on.
Therefore, the chemical name of compound is Tetra-phosphorous nonoxide.
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Explanation:
In the attachment fig ABCD is a parallelogram with AC as diagonal.
we know that,
In a parallelogram opposite sides are equal and parallel
In a parallelogram sum of adjacent angles is 180°
that is
∠A+∠D= ∠B+∠C= 180°
Also, in a parallelogram opposite angles are equal.
So in ΔADC and ΔABC
1) AD=BC
2) DC= AB
And
3) ∠ADC= ∠ABC
therefore, ΔADC and ΔABC are congruent to each other and Emily was right.
