Question 1

Identify the type of bond in oxygen molecule.

Accepted Answer

Double covalent bond

Answer

None

Answer

Single covalent bond

Answer

Triple covalent bond

Question 2

Indicate the valence of oxygen atom.

Accepted Answer

Based on the Lewis dot structure, Oxygen atom has 2 unpaired electrons. So, its valence is 2

Question 3

Determine the atomic number of the element nitrogen.

Accepted Answer

Atomic number: 7

Answer

Atomic number: 8

Answer

none

Answer

Atomic number: 6

Question 4

A scuba diver has planned for deep-diving, for this purpose he filled hisbreathing bottle with a mixture of oxygen (O₂) gas and 0.8g of helium (He) gas.

- Calculate the number of moles ofhelium gas filled in the bottle.

Given Mollar mass of He: 4 g/mol

Accepted Answer

0.2 moles

Answer

0.3 moles

Answer

5.1 moles

Question 5

Explain why the scuba diver has filled his breathing bottle with a mixture of helium gas and oxygen gas insteadof a mixture of nitrogen gas and oxygen gas.

Accepted Answer

Under high pressure (deep-diving) nitrogen gas is dissolved in the blood, where it can cause mental disorientation

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