During mr. nye's science class, students were expected to identify various substances using physical properties they could easily measure. mr. nye gave each of the five groups a green, metal cube and asked them to identify what the cube was made of. matt's cube, after 5 trials, had an average density of 7.40 g/cm3 . his group's cube was made of a) aluminum. b) gold. c) nickel. d) zinc.

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.