BTEC APPLIED SCIENCE UNIT 1
CHEMISTRY COMPREHENSIVE
QUESTIONS AND VERIFIED ANSWERS
2026(GRADED A+) DETAILED ANSWERS.
How many electrons can an s subshell hold? - CORRECT ANSWER (S) -2
How many electrons can a p subshell hold? - CORRECT ANSWER (S) -6
How many electrons can a d subshell hold? - CORRECT ANSWER (S) -10
Which subshells are available in the first energy level? - CORRECT ANSWER (S) -s
,Which subshells are available in the second energy level? - CORRECT ANSWER (S) -
s and p
Which subshells are available in the third energy level? - CORRECT ANSWER (S) -s,
p and d
What is Hund's rule? - CORRECT ANSWER (S) -Orbitals must all be singly filled
before they can be doubly occupied
Which elements do not fill the 4s subshell before the 3d subshell? - CORRECT
ANSWER (S) -Copper and chromium
Define the term ionic bond - CORRECT ANSWER (S) -The electrostatic attraction
between oppositely charged ions
What is the charge of an ion from group 1? - CORRECT ANSWER (S) -+1
,What is the charge of an ion from group 2? - CORRECT ANSWER (S) -+2
What is the charge of an ion from group 6? - CORRECT ANSWER (S) --2
What is the charge of an ion from group 7? - CORRECT ANSWER (S) --1
Explain how atoms of sodium react with atoms of chlorine - CORRECT ANSWER (S)
-Na loses its 2s1 electron gaining a +ve charge.
Cl gains an electron in the 3p subshell gaining a -ve charge.
The opposite charges attract to form NaCl
Why do ionic bonds have such high melting points? - CORRECT ANSWER (S) -Each
+ve ion is surrounded by 6 -ve ions and vice versa.
Strong electrostatic attraction in every direction.
Requires a large amount of energy to break
, State two factors that affect the strength of an ionic bond - CORRECT ANSWER (S) -
Size of ion and charge on ion
When can ionic substances conduct electricity? - CORRECT ANSWER (S) -When
molten or in aqueous solution
Describe the properties of ionic compounds - CORRECT ANSWER (S) -Conduct
electricity when molten or aqueous solution
High melting/boiling points
Usually soluble in water
Define the term covalent bond - CORRECT ANSWER (S) -A shared pair of electrons
Which metals lose electrons from the 4s subshell before the 3d subshell? -
CORRECT ANSWER (S) -Transition metals
CHEMISTRY COMPREHENSIVE
QUESTIONS AND VERIFIED ANSWERS
2026(GRADED A+) DETAILED ANSWERS.
How many electrons can an s subshell hold? - CORRECT ANSWER (S) -2
How many electrons can a p subshell hold? - CORRECT ANSWER (S) -6
How many electrons can a d subshell hold? - CORRECT ANSWER (S) -10
Which subshells are available in the first energy level? - CORRECT ANSWER (S) -s
,Which subshells are available in the second energy level? - CORRECT ANSWER (S) -
s and p
Which subshells are available in the third energy level? - CORRECT ANSWER (S) -s,
p and d
What is Hund's rule? - CORRECT ANSWER (S) -Orbitals must all be singly filled
before they can be doubly occupied
Which elements do not fill the 4s subshell before the 3d subshell? - CORRECT
ANSWER (S) -Copper and chromium
Define the term ionic bond - CORRECT ANSWER (S) -The electrostatic attraction
between oppositely charged ions
What is the charge of an ion from group 1? - CORRECT ANSWER (S) -+1
,What is the charge of an ion from group 2? - CORRECT ANSWER (S) -+2
What is the charge of an ion from group 6? - CORRECT ANSWER (S) --2
What is the charge of an ion from group 7? - CORRECT ANSWER (S) --1
Explain how atoms of sodium react with atoms of chlorine - CORRECT ANSWER (S)
-Na loses its 2s1 electron gaining a +ve charge.
Cl gains an electron in the 3p subshell gaining a -ve charge.
The opposite charges attract to form NaCl
Why do ionic bonds have such high melting points? - CORRECT ANSWER (S) -Each
+ve ion is surrounded by 6 -ve ions and vice versa.
Strong electrostatic attraction in every direction.
Requires a large amount of energy to break
, State two factors that affect the strength of an ionic bond - CORRECT ANSWER (S) -
Size of ion and charge on ion
When can ionic substances conduct electricity? - CORRECT ANSWER (S) -When
molten or in aqueous solution
Describe the properties of ionic compounds - CORRECT ANSWER (S) -Conduct
electricity when molten or aqueous solution
High melting/boiling points
Usually soluble in water
Define the term covalent bond - CORRECT ANSWER (S) -A shared pair of electrons
Which metals lose electrons from the 4s subshell before the 3d subshell? -
CORRECT ANSWER (S) -Transition metals
