Match the vocabulary word with its definition. match the items in the left column to the items in the right column.

1. mass per unit volume
inorganic
2. resistance of a material to being scratched
organic
3. compounds that contain carbon
density
4. compounds that do not contain carbon
hardness

Ineed to find the answer of this question because i dont understand it

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

A2.5% (by mass) solution concentration signifies that there is a 2.5 % (by mass) solution concentration signifies that there is blank of solute in every 100 g of solution. of solute in every 100 g of solution