BTEC Applied Science Unit 1 Chemistry Questions with Correct 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? 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