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.

• boiling

• change of solid to gas

• evaporation

• change of solid to liquid

• deposition

• change of liquid to gas at any temp.

• melting

• change of liquid to gas at specific temp

• sublimation

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?

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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.