Acontainer has the dimensions of 30 cm x 50 mm x 0.2m. the density of it contents is 2.5 g/cm^3. what is the mass of the substance in kilograms?

Convert all the measurements of the container into cm so you can use the cm^3 value.  

30cm = 30cm  

50mm = 5cm  

0.1m = 10cm  

30 * 5 * 10 = 1500 cm^3  

mass = density * volume = 2.5 * 1500 = 3750 g  

1000g = 1kg  

The mass of the substance is 3.75kg  

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qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.