Chemistry Tuition Singapore Secondary Science Tuition – Solution and Suspension

Rate of dissolving

• Rate of dissolving refers to how fast a solute can dissolve in a fixed amount of solvent.
• The factors affecting the rate of dissolving are as follows:

1. Temperature
2. Stirring effect
3. Particle size of solute
4. Amount of solvent

SUSPENSIONS

• It is a heterogeneous mixture of a solid-liquid.
• The solute does not dissolve in the solvent. Examples are chalk powder mixes with water or sand placed in water.

The characteristics of a suspension from a mixture of solid-liquid are as follows:

1. There are particles settling at the bottom of the liquid after being left standing for a while.
2. It scatters light as it does not allow light to pass through it. This is
   because the solute particles are large enough to scatter light or block the passage of light.
3. There are particles remaining on the filter paper as residue after filtration. This is because the size of the solute particles is too large to pass through the filter paper.
4. It appears cloudy because there are particles suspending in the solvent.

Please contact Angie @ 96790479 or Mr Ong @ 98639633 if you need Lower Secondary Chemistry Tuition