22/11/19 Christmas Exam Flashcards Preview

Chemistry Test Mistakes > 22/11/19 Christmas Exam > Flashcards

Flashcards in 22/11/19 Christmas Exam Deck (4)
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1
Q

2 characteristics of transition elements

A

Form coloured ions and compounds

Their compounds often act as catalysts

2
Q

why does NH3 have a pyramidal shape?

A
  • It has 3 bonded pairs of electrons and 1 one lone pair on the outer shell of the central atom
  • The lone pair has a stronger repulsion so the bonded pairs are pushed closer together, the bonded pairs have a weaker repulsion
3
Q

how many grams of PbO in 0.05 moles

A

0.05 x 223 = 11.15 g

4
Q

nuclear equation for decay of polonium 210 . 1 alpha particle

A

210 Po82 -> 206Pb82 +4He2