Unit 1.7 Density, Graphs, & Slope Flashcards
What are Unitary rates?
A derived unit requiring division and a combination of two units with one of them being quoted as “per” unit of measurement.
What is the formula of density?
D = m/v
How would you compare the masses of different materials?
Find the density of each
Define density
– Mass of material compared to its size
– Mass of a unit volume of material
– density = mass/volume
What are the common units of density?
– Solids = g/cm^3 or kg/m^3
– Liquids = g/mL or kg/L
Why does density depend on the temperature of a material?
Most materials expand when heated and contract when cooled.
An object has a volume of 50.0 cm^3 and a mass of 175 g. Find its density.
– d = m/v
– = 3.5 g/cm^3
– = 3.50 g/cm ^3
Rules of objects floating on water
– An object must have a density less than water’s to float
– An object with a density higher than water’s sinks
Does density depend on size?
No
The __ variable is controlled by the experimenter.
independent
The __ variable is a value that depends on the independent variable.
dependent
Label the variables on an x-and y-axis.
– x-axis = independent variable
– y-axis = dependent variable
Define interpolated values.
Predicted values located within the data field
Define extrapolated values
– Predicted values located outside the data field
– Not as reliable as interpolated values
Define a direct variation.
– A direct relationship indicates that whatever happens to a value on the x-axis causes a proportionate change to the corresponding value on the y-axis.
– If the extrapolated line does pass through the origin
