what does is mean when a number written in scientific notation has a positive exponent? What does it mean when a number written is scientific notation has a negative exponent.

A positive exponent demonstrates that the respective decimal is shifted a certain number of places to the right.

A negative exponent demonstrates that the respective decimal is shifted a certain number of places to the left.

In scientific notation, the number of digits indicates the number of significant figures in any number. 

Negative- (Times 10 to the negative)

Positive- (Times 10 to the positive)

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a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

the temperature of the gas, in k, not celsius.