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Chemistry Exam > Density > Flashcards

Density Flashcards

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1
Q

156 g sample of steel has a volume of 20.0 mL. What is the density of the steel sample?

___ g/mL

A

7.80

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2
Q

The density of an object relies on both the ________________ of the object.

A

volume and mass

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3
Q

A material with a density of 2.7 grams/mL occupies 35.6 mL. How many grams of the material are there?

A

96.12

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4
Q

A 50.0 mL volumetric flask filled with aqueous solution of hydrogen peroxide has a total mass of 88.5 g. The mass of the volumetric flask is 16.5 g. What is the density of the aqueous solution of hydrogen peroxide?

A

1.44

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5
Q

Placing a sample of iron (II) oxide into a graduated cylinder makes the water volume increase 12.0 mL. The mass of the sample is 76.6 g. What is its density? (Round to the nearest hundredths)

___ g/mL

A

6.383

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6
Q

24 g copper is submerged in water in a graduated cylinder, and the total volume increases by 2.7 mL. What is the density of copper?

(Your answer should only have 2 significant figures.)

___ g/cm3

A

8.8

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7
Q

A cubic container is filled up with an unknown liquid whose density is 0.180 g/ cm3. The side length of the container is 5.00 cm. What is the mass of this liquid?

___ g

A

22.5

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8
Q

The mass of sample X is 20.0g. It was placed in a graduated cylinder and the water level rose from A (14 mL) to B (19 mL). What is the density of sample X? Pay close attention to significant figures.

___ g/mL

A

4.0

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9
Q

156 g sample of steel has a volume of 20.0 mL. What is the density of the steel sample?

___ g/mL

A

7.80

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10
Q

The formula for density is d=mV. A piece of wood has a mass of 25 kg and a volume of 0.0385 m3. What is the density of the wood?

A

649kg/m^3

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11
Q

A 4.24 kg marble slab has a volume of 1564 cm3. What is its density in g/cm3?

A

2.71 g/cm3

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12
Q

____ is a measure of how closely packed particles of matter are in a certain amount of space.

A

Density

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13
Q

A certain liquid sample has a volume of 14.7 mL and a mass of 22.8 grams. Calculate the density.

A

1.55 g/mL

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14
Q

The density formula is d=mV. A cylinder of lead has a diameter of 3 cm and a height of 8 cm. The density of lead is 11.4 g/cm3. What is the mass of the cylinder?

A

644.3 grams

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15
Q

A 50.0 mL beaker contains 680. g mercury. What is the density of mercury?

A

13.6 g/mL

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16
Q

The density of ethanol is 0.789 g/mL at 20° C.

What is the mass of 80.0 mL of ethanol at 20° C?

A

63 g

17
Q

Which of the following statements correctly describes density?

A

Density is an intensive property because it does not depend on the amount.

18
Q

Complete the sentence using the words increases, decreases or remains same.
As the temperature increases, density generally ___

A

decreases

19
Q

The density of gold is 19.3 grams per cm3.

What is the mass of a gold block that measures 10 cm by 3 cm by 3 cm?

A

1737 grams or 1.737 kg

20
Q

Using the above diagram as a reference, which of the following best explains why ice floats on water?

A

The molecules in ice are more spread out so ice is less dense than water

21
Q

At 20∘C, skim milk has a density 1.033 kilograms per liter, while light cream has a density of 1.012 kilograms per liter.

At 20∘C, what is the mass of one gallon of skim milk if 1 liter is approximately 0.264 gallons?

A

3.9 kilograms

22
Q

Roland is measuring a physical property of an object. He records the measurement “3.12 g/cm3”. Roland was most likely measuring which of the following?

A

density

23
Q

Gases have much higher density than liquids.

A

false

24
Q

At 20∘C, skim milk has a density 1.033 kilograms per liter, while light cream has a density of 1.012 kilograms per liter.

At 20∘C, a container holding 9 liters of liquid is 9.108 kilograms. Does the container hold skim milk or light cream?

A

light cream

25
Q

The SI unit of density is kg/m3, but densities of most solids and liquids are usually reported in units of g/cm3(org/mL).

A

true

26
Q

Solids and liquids have higher densities than gases.

A

true

27
Q

Density is defined as the mass of an object divided by its volume.

A

true

28
Q

The gases are less dense than liquids or solids at room temperature.

A

true

29
Q

True or False:

If a ball with a density of 0.90 g/cm3 is submerged in ethanol, it may float up by adding water to ethanol. (The density of water is 1.0 g/mL and the density of ethanol is 0.80 g/mL)

A

true

30
Q

True or false:

In order to float, the gases inside a hot air balloon are heated. Because the density of gases is lower when temperature increases, the hot air balloon can float.

A

true

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