ceutics

A powder's particle size is important in formulation because it can affect which combination?

flow, compression, settling rate, and solubility

Which statement best distinguishes diffusion from dissolution?

Diffusion is movement from high to low concentration, whereas dissolution is particles dissolving in surrounding fluid

Why can a drug's dissolution be important before absorption?

Some drugs must first dissolve in surrounding fluid before they can be absorbed

A formulation scientist wants to characterize how much empty space exists within a material. Which property is most directly relevant?

Porosity

A scientist is evaluating how winding a pathway is for material to move through a powder. Which property is being considered?

tortuosity

Which statement correctly compares true density and bulk density?

True density excludes space between separate particles, while bulk density includes that interparticle space

A liquid's resistance to flow is best described by:

viscosity

A material becomes thinner and flows more easily under stress, then thickens at rest. This behavior is:

thixotropy

Which situation is most directly related to interfacial tension?

an oil-water boundary

A small contact angle generally indicates:

Better wetting and a more hydrophilic surface

A large contact angle generally indicates:

Poor wetting and a more hydrophobic surface