Unit 2 Review - Chemistry

Front

What is the formula to calculate heat energy (q) required to change the temperature of a substance?

Back

q = m * c * ΔT, where m is mass, c is specific heat, and ΔT is the change in temperature.

Front

What is specific heat capacity?

Back

Specific heat capacity is the amount of heat required to raise the temperature of 1 gram of a substance by 1°C.

Front

How do you calculate the change in temperature (ΔT)?

Back

ΔT = final temperature - initial temperature.

Front

What is hydrogen bonding?

Back

Hydrogen bonding is a strong type of dipole-dipole attraction that occurs between molecules when hydrogen is bonded to highly electronegative atoms like nitrogen, oxygen, or fluorine.

Front

Which molecules exhibit hydrogen bonding?

Back

Molecules like NH3 (ammonia), H2O (water), and HF (hydrofluoric acid) exhibit hydrogen bonding.

Front

What are intermolecular forces?

Back

Intermolecular forces are forces of attraction or repulsion between neighboring particles (atoms, molecules, or ions).

Front

What type of intermolecular force is present in CO2?

Back

CO2 exhibits dispersion forces, which are weak intermolecular forces arising from temporary dipoles.

Front

How can you determine if a molecule is polar or non-polar?

Back

A molecule is polar if it has a net dipole moment due to the arrangement of its polar bonds; otherwise, it is non-polar.

Front

What is the significance of a phase change graph?

Back

A phase change graph shows the states of matter (solid, liquid, gas) and the transitions between them as temperature or pressure changes.

Front

In a phase change graph, where is the substance a solid?

Back

The substance is a solid in the region where the temperature is constant and the phase is changing from solid to liquid (A to B).