Ch.6.6 Flashcards

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1
Q

Density is ______________________________________ and its unit is ____________ or _____________.

A

the mass per unit of a substance

g/cm3, kg/m3

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2
Q

For the same volume, substances with ________________ ________________ have ________________ ________________.

A

higher density, greater mass

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3
Q

Formula of density:

A

density (g/cm3)= mass (g)/ volume (cm3)

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4
Q

The density of a substance ________________ ________________ with its ______________ or _____________.

A

doesn’t change, volume, mass

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5
Q

Whether an object ________________ or ________________ in a liquid depends on its ________________.

A

floats, sinks, density

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6
Q

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.

A

floats, lower, sinks, higher

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7
Q

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.

A

float, large volume of air, less dense

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8
Q

When the volume of an object ________________ and its mass remains ________________, its overall density ________________.

A

increases, unchanged, decreases

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9
Q

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.

A

steel, denser, large volume of air, lowers, overall densities, ships, float

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10
Q

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 ________________.

A

further apart, expand, volume, increases, mass, unchanged, density, deceases, cooled, closer together, smaller volume, increases

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11
Q

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 ________________
A

plastic bag
heated, faster, further apart, density decreases
overall density, lower, density, rises

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