0620 Chemistry IGCSE: States of Matter

Which of these gas will travel the slowest

• O₂

• N₂

• NH₃

• CO₂

Which gas is commonly used in balloons for lifting?

• Helium

• Oxygen

• Nitrogen

• Carbon Dioxide

Gases move at different speeds because of the different​ (a)   ​

• mass
• volume
• scarcity
• color

When we are handling both hydrochloric acid and ammonia, apart from the gloves, what other safety precautions we have to take?

• wearing mask

• wearing goggles

• preparing a fire extinguisher

• wearing a fire-resistant cloth.

It takes some time for the white precipitate or the white ring to form. What changes can we make in the experiment so that the diffusion happens faster?

• increase the height of the column

• decrease the pressure

• increase the temperature

• make the column vacuum.

Based on the result of the experiment in the video, if we change the substances to CH₃CH₂OH gas and CH₃OCH₃ gas what would be the most possible result?

• CH₃CH₂OH would travel faster than CH₃OCH₃

• CH₃CH₂OH would travel slower than CH₃OCH₃

• CH₃CH₂OH would travel as fast as CH₃OCH₃

• CH₃CH₂OH would travel greater distance than CH₃OCH₃

Answer explanation

Match the following changes of phase to the correct term.

• change of gas to solid.

• melting

• change of solid to liquid

• boiling

• change of liquid to gas at specific temp

• sublimation

• change of solid to gas

• deposition

• change of liquid to gas at any temp.

• evaporation

The picture attached is the model of diffusion of coffee particles.

Since we have been discussing about diffusion in fluids, why can't diffusion happen in solids?

In which direction do particles move during diffusion?

• Low concentration to high concentration

• high concentration to low concentration

How would you describe the movement of particles during the diffusion process?

• predictable

• random

• ordered

• following a certain pattern.