Ch.6.6 Flashcards
Density is ______________________________________ and its unit is ____________ or _____________.
the mass per unit of a substance
g/cm3, kg/m3
For the same volume, substances with ________________ ________________ have ________________ ________________.
higher density, greater mass
Formula of density:
density (g/cm3)= mass (g)/ volume (cm3)
The density of a substance ________________ ________________ with its ______________ or _____________.
doesn’t change, volume, mass
Whether an object ________________ or ________________ in a liquid depends on its ________________.
floats, sinks, density
An object ________________ in a liquid if its density is ________________ than that of a liquid. On the other hand, an object ________________ in a liquid if its density is ________________ than that of a liquid.
floats, lower, sinks, higher
Why can the same lump of plasticine float after being kneaded into the shape of a boat?
The plasticine can ________________ in water after we have made it into a shape containing a ________________ ________________ __________ _____________, which is far ________________ ________________ than water.
float, large volume of air, less dense
When the volume of an object ________________ and its mass remains ________________, its overall density ________________.
increases, unchanged, decreases
Many ships are made from ________________, which is ________________ than water. However, the bodies of ships contain a ________________ ________________ ________ ____________ and this ________________ the ________________ ________________ of the ________________. Therefore, the ships can ________________ in water.
steel, denser, large volume of air, lowers, overall densities, ships, float
The particles of a substance move ________________ ________________ when the substance is heated. This causes the substance to ________________, and since the ________________ of the substance ________________ while the ________________ remains ________________, the ________________ of the substance ________________. Similarly, when a substance is ________________, its particles move ________________ ________________. This results in a ________________ ________________ of the substance. Therefore, the density of the substance ________________.
further apart, expand, volume, increases, mass, unchanged, density, deceases, cooled, closer together, smaller volume, increases
How do hot air balloons work?
- a hot air balloon works like a ________________ ________________
- when the air inside the hot air balloon is ________________, the air particles move ________________ and become ________________ ________________.
- The air expands so its ________________ ________________.
- the ________________ ________________ of the balloon becomes ________________ than the ________________ of the air around it and thus the balloon ________________
plastic bag
heated, faster, further apart, density decreases
overall density, lower, density, rises