science

1)Compare the properties of metals nonmetals and metolliods?

2)Why can elements and compound be considered pure substance?

3)What is the difference between colloids and suspension?

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  1. 1)Elements that have properties of both metals and nonmetals are called metalloids. They can be shiny or dull and their shape is easily changed. Metalloids typically conduct heat and electricity better than nonmetals but not as well as metals.....

    Nonmetals, on the right side of the periodic table, are very different from metals. Their surface is dull and they are poor conductor of heat and electricity. As compared to metals, they have low density and will melt at low temperatures. The shape of a nonmetal cannot be changed easily as they tend to be brittle and will break.

    2)Pure substances r those substances which r made of only one kind of PARTICLES. Now these particles can be ATOMS OR MOLECULES.

    3)Particle size. From the reference, "Colloidal particles are larger than molecules but too small to be observed directly with a microscope; however, their shape and size can be determined by electron microscopy. In a true solution the particles of dissolved substance are of molecular size and are thus smaller than colloidal particles; in a coarse mixture (e.g., a suspension) the particles are much larger than colloidal particles. Although there are no precise boundaries of size between the particles in mixtures, colloids, or solutions, colloidal particles are usually on the order of 10^-7 to 10^-5 cm in size."

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