A colloid is cloudy and thick and will not allow light to pass through, whereas a suspension is clear and transparent and lets light pass through it.
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A torch can be used to test a colloid by shining the light through the colloid. If the colloid scatters the light making it visible (Tyndall effect), then it is a colloid. This is because the particles in the colloid are large enough to scatter light, unlike particles in a solution which are too small.
Shine the torch through the mixture. If the light passes through the mixture without scattering, it is likely a solution as the particles are small and do not block the light. If the light is scattered and the beam is visible, it is likely a colloid due to the larger particle size that causes light scattering.
One way to differentiate between a solution and a colloid is through the Tyndall effect. In a solution, light passes through without scattering, while in a colloid, light scatters because the particles are large enough to reflect light. This can be observed by shining a light through the mixture - if the light beam is visible, it is a colloid, whereas if the beam is not visible, it is a solution.
Yes, mouthwash is a colloid. It is a liquid mixture containing suspended particles that do not settle out.
One test to determine if a mixture is a true solution or a colloid is the Tyndall effect. If light passing through the mixture scatters, making the beam visible, it suggests the presence of larger particles characteristic of a colloid. In contrast, a true solution will not scatter light and the beam will be invisible.
No, gold is not a colloid. Gold is a pure element and does not form a colloid by dispersing into another substance.