Gas Properties and Chemical Changes

These flashcards cover key concepts regarding gas properties, intermolecular forces, changes of state, and types of solids as discussed in the lecture.

What happens to the speed of gas molecules when temperature increases?

The speed of gas molecules increases.

Which gas moves the fastest at the same temperature and pressure: the lighter or the heavier one?

The lighter gas moves faster.

In an ordered list of gases based on their molar mass, which gas would have the highest velocity?

The gas with the lowest molar mass.

What is the molar mass of helium?

4 g/mol.

What is the molar mass of HCl?

36.5 g/mol.

Why do heavier gas molecules have lower velocities?

Heavier molecules are less mobile and slower due to their larger mass.

What are intermolecular forces?

Forces that occur between molecules.

What are intramolecular forces?

Forces that occur within a molecule.

Give an example of an intermolecular force.

Hydrogen bonding or Van der Waals forces.

What is an example of an intramolecular force?

Covalent or ionic bonds.

What type of change is freezing water?

Physical change.

What type of change is evaporation?

Physical change.

What are the two main types of solids?

Amorphous solids and crystalline solids.

What is the primary characteristic of a covalent network crystal?

Composed of atoms connected by covalent bonds in a continuous network.

What is the example given for a metallic crystal?

Iron or any metal.

What characteristic do mobile electrons provide in metals?

They allow the metal to conduct heat and electricity.

What can you say about the covalent network crystal compared to ice?

Diamonds (covalent network crystals) have stronger bonds than ice.