BTEC Applied Science Unit 1 Exam Questions & Answers.
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Course
BTEC
Institution
BTEC
BTEC Applied Science Unit 1 Exam Questions & Answers.
How many electrons can an s subshell hold? - CORRECT ANSWER 2
How many electrons can a p subshell hold? - CORRECT ANSWER 6
How many electrons can a d subshell hold? - CORRECT ANSWER 10
Which subshells are available in the first energ...
BTEC Applied Science Unit 1 Exam
Questions & Answers.
How many electrons can an s subshell hold? - CORRECT ANSWER 2
How many electrons can a p subshell hold? - CORRECT ANSWER 6
How many electrons can a d subshell hold? - CORRECT ANSWER 10
Which subshells are available in the first energy level? - CORRECT ANSWER s
Which subshells are available in the second energy level? - CORRECT ANSWER s and p
Which subshells are available in the third energy level? - CORRECT ANSWER s, p and d
What is Hund's rule? (Think bus seats!) - CORRECT ANSWER 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 Copper and
chromium
Define the term ionic bond - CORRECT ANSWER The electrostatic attraction between oppositely charged
ions
What is the charge of an ion from group 1? - CORRECT ANSWER +1
What is the charge of an ion from group 2? - CORRECT ANSWER +2
What is the charge of an ion from group 6? - CORRECT ANSWER -2
,What is the charge of an ion from group 7? - CORRECT ANSWER -1
Explain how atoms of sodium react with atoms of chlorine - CORRECT ANSWER 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 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 Size of ion and charge on
ion
When can ionic substances conduct electricity? - CORRECT ANSWER When molten or in aqueous
solution
Describe the properties of ionic compounds - CORRECT ANSWER Conduct electricity when molten or
aqueous solution
High melting/boiling points
Usually soluble in water
Define the term covalent bond - CORRECT ANSWER A shared pair of electrons
Which metals lose electrons from the 4s subshell before the 3d subshell? - CORRECT ANSWER Transition
metals
Why do metals have such high melting points? - CORRECT ANSWER Strong force of attraction between
positive ions and delocalised electrons. This requires a large amount of energy to overcome.
, State the two factors that affect the strength of metallic bonding - CORRECT ANSWER Size of ion
Charge on ion
Explain how the charge on metal ions affects the strength of the metallic bond - CORRECT ANSWER The
larger the +ve charge the greater the attraction between the nucleus and the delocalised electrons
Explain how the size of the metal ions affects the strength of the metallic bond - CORRECT ANSWER The
smaller the +ve ion the closer the nucleus is to the delocalised electrons creating a greater attraction
Explain why metals conduct electricity - CORRECT ANSWER The delocalised electrons 'carry' charge.
Current flows because of this.
Explain why metals conduct heat - CORRECT ANSWER Particles are paced tightly so kinetic energy is
passed from ion to ion. The delocalised electrons also enable heat to be passed.
Explain why metals are ductile and malleable - CORRECT ANSWER The lattice structure allows layers of
metal ions to slide over each other without disrupting bonding
Name the 3 forces between molecules - CORRECT ANSWER Van der Waals
Permanent dipole-dipole
Hydrogen bonds
Order the 3 forces between molecules in order of strongest to weakest - CORRECT ANSWER Hydrogen
bonds
Permanent dipole-dipole
Van der Waals
How are Van der Waal's forces formed? - CORRECT ANSWER Electrons move to one side, caused
temporary dipole. This induces a temporary dipole in neighbouring molecules. Attraction occurs
between oppositely charged dipoles
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