IB Semester 1 Final

Front

What is Avogadro's constant?

Back

Avogadro's constant (L or Nₐ) is 6.02 × 10²³ mol⁻¹, representing the number of particles (atoms, molecules, etc.) in one mole of a substance.

Front

How many hydrogen atoms are in 2.00 mol of NH₃?

Back

There are 3.61 × 10²⁴ hydrogen atoms in 2.00 mol of NH₃.

Front

What is the highest metallic character in Group 14?

Back

Tin (Sn) has the highest metallic character in Group 14.

Front

What is the correct formula for ammonium phosphate?

Back

The correct formula for ammonium phosphate is (NH₄)₃PO₄.

Front

What is a characteristic of all solid ionic compounds?

Back

All solid ionic compounds exhibit poor electrical conductivity.

Front

Which element is a d-block element?

Back

Cobalt (Co) is a d-block element.

Front

Define metallic character.

Back

Metallic character refers to the level of reactivity of a metal, which increases down a group and decreases across a period.

Front

What is the general trend of melting points in ionic compounds?

Back

Ionic compounds generally have high melting points due to strong electrostatic forces between ions.

Front

What is the significance of the formula for ammonium phosphate?

Back

The formula (NH₄)₃PO₄ indicates that there are three ammonium ions for every phosphate ion in the compound.

Front

Explain why solid ionic compounds are poor conductors of electricity.

Back

Solid ionic compounds are poor conductors of electricity because their ions are fixed in place within a crystal lattice and cannot move freely.