BTEC Applied Science All Exam Questions and Answers 100% Pass

BTEC Applied Science All Exam Questions
and Answers 100% Pass


How many electrons can an s subshell hold? -

[ANSWER]: 2




QUESTION: How many electrons can a p subshell hold? -

[ANSWER]: 6




QUESTION: How many electrons can a d subshell hold? -

[ANSWER]: 10




QUESTION: What is Hund's rule? -

[ANSWER]: Orbitals must all be singly filled before they can be doubly

occupied

,QUESTION: Define the term ionic bond -

[ANSWER]: The electrostatic attraction between oppositely charged

ions




QUESTION: What is the charge of an ion from group 1? -

[ANSWER]: +1




QUESTION: What is the charge of an ion from group 2? -

[ANSWER]: +2




QUESTION: What is the charge of an ion from group 6? -

[ANSWER]: -2




QUESTION: What is the charge of an ion from group 7? -

[ANSWER]: -1

,QUESTION: Explain how atoms of sodium react with atoms of

chlorine -

[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




QUESTION: Why do ionic bonds have such high melting points? -

[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




QUESTION: State two factors that affect the strength of an ionic bond

-

[ANSWER]: Size of ion and charge on ion

, QUESTION: When can ionic substances conduct electricity? -

[ANSWER]: When molten or in aqueous solution




QUESTION: Describe the properties of ionic compounds -

[ANSWER]: Conduct electricity when molten or aqueous solution

High melting/boiling points

Usually soluble in water




QUESTION: Define the term covalent bond -

[ANSWER]: A shared pair of electrons




QUESTION: Which metals lose electrons from the 4s subshell before

the 3d subshell? -

[ANSWER]: Transition metals




QUESTION: Why do metals have such high melting points? -