Triple covalent bond+ Diamond?

Question

1) What is a triple covalent bond?
a. an electron is shared between 3 atoms
b. 3 electrons are shared between 3 atoms
c. 3 electrons are shared between atoms

2) a diamond is composed of?
a. metals (Al)
b. Non metals (O)
c. Transition metals (Zn)
d. Metalloids (C)

3) Does silicon dioxide have the same structure asd diamonds?
a. yes
b.no
c. it depends on which diamond

4) Which of these proprieties for a diamond is correct?
a. low melting point
b. soluble in water / orgainic substances
c. doesnt conduct electricity

Answer 1

1) Six electrons are shared between two atoms. I'm sorry if this correct answer does not correspond with your choices.

2) Nonmetals, namely carbon

3) No. Silicon forms four bonds to other atoms, oxygen only two. In diamond, each carbon that forms bonds with other elements is bonded only to another carbon in the same circumstance.

4) Diamond does not conduct electricity.

Answer 2

The first two questions have errors in their answers.

A triple bond is where six electrons are shared between two atoms. So none of the answers provided are correct. There are no triple bonds in diamonds. There a carbon atom is joined by four other single covalent bonds to four other carbon atoms in a tetrahedral shape.

In the second question, Carbon is NOT a metalloid. It is a non-metal. So none of the answers are correct.

The answer for 3 is b and for 4 is c.

Silicon dioxide can have an amorphous form as glass or as a crystal in quartz. So the form its molecules can have depends on how fast the molten SiO2 is cooled to a solid.

In regard to question 4, the diamond has the highest melting point of any known substance. In fact it is so high that there is nothing that can be used as a container to melt it in as all containers would melt long before it did. In fact no one has ever melted a diamond at one atmosphere (101.3 kPa) and its melting point is calculated from theoretical formulas.