Lesson Worksheet: Group 15 Chemistry

In this worksheet, we will practice describing and explaining the properties and economic importance of the group 15 elements.

Q1:

Group 15 elements have similarities in the electronic configurations of their atoms. How do the electronic configurations of the group 15 elements terminate?

  • Ad
  • Bp
  • Cs
  • Dd
  • Ep

Q2:

Which of the following statements correctly states a similarity between arsenic and antimony?

  • AThey are both more abundant in Earth’s crust than phosphorus.
  • BThey are both metalloids.
  • CThey both contain 4 electrons in their last p orbital.
  • DThey are both less dense than nitrogen.
  • EThey both form diatomic molecules under standard conditions.

Q3:

Group 15 elements form hydrides of the formula XH3.

Why are group 15 hydrides considered to be basic?

  • AThey are formed from highly electronegative elements.
  • BThey react vigorously with alkaline solutions.
  • CThey have a lone pair of electrons in the outer valence shell.
  • DThe central atom only bonds with hydrogen atoms.
  • EThey are able to form dative or coordinate bonds.

Which statement best explains why group 15 hydrides decrease in basic strength as we go down the group?

  • AStronger bonds are formed between the central atom and the hydrogen atoms.
  • BThe increased size of the atom decreases the electron density of the lone pair.
  • CLarger hydrides lose their hydrogen atoms more easily to OH ions forming water molecules.
  • DAs the size of the atom increases, it is more able to donate its pair of electrons to another atom.
  • EThe steric strain created between the bonds and the central atom decreases.

Q4:

Which of the following is a group 15 element?

  • ANa
  • BN
  • CNi
  • DNe
  • ENb

Q5:

What are the three allotropic forms of arsenic?

  • ARed, black, and gray
  • BRed, black, and violet
  • CBlue, black, and red
  • DViolet, red, and gray
  • EYellow, black, and gray

Q6:

Which of the following are the two most common allotropic elements in group 15?

  • ANitrogen and antimony
  • BPhosphorus and arsenic
  • CArsenic and nitrogen
  • DPhosphorus and bismuth
  • ENitrogen and bismuth

Q7:

Phosphorus is an element of group 15 that exhibits allotropic forms.

What are the most common allotropes of phosphorus?

  • AGray phosphorus and red phosphorus
  • BPink phosphorus and red phosphorus
  • CWhite phosphorus and red phosphorus
  • DWhite phosphorus and gray phosphorus
  • EWhite phosphorus and pink phosphorus

Which of these allotropes is a waxy solid that can be cut with a knife?

  • AWhite phosphorus
  • BRed phosphorus
  • CBlack phosphorus
  • DPink phosphorus
  • EGray phosphorus

Q8:

Which of the following pairs are metalloids included in group 15 elements?

  • APhosphorus and bismuth
  • BBismuth and arsenic
  • CAntimony and arsenic
  • DPhosphorus and arsenic
  • EAntimony and bismuth

Q9:

Which of the following properties is not true for group 15 elements?

  • AThe melting points decrease down the group.
  • BThe electronegativity decreases down the group.
  • CThe metallic property increases down the group.
  • DThe atomic radii increase down the group.
  • EThe ionization energy decreases down the group.

Q10:

Which of the following group 15 elements can be used in the production of the head of a match, shown in the illustration?

  • AAntimony
  • BNitrogen
  • CPhosphorus
  • DArsenic
  • EBismuth

This lesson includes 19 additional questions and 6 additional question variations for subscribers.

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