Chemistry, 24.03.2020 19:58 AgarioEdit

A particular uranium alloy has a density of 18.75 g/cm3. Please answer the following questions below, providing the explanation to your answers. a. What volume is occupied by a critical mass of 49 kg of this alloy? b. The critical mass can be decreased to 16 kg if the alloy is surrounded by a layer of natural uranium (which acts as a neutron reflector). What is the volume of such smaller mass? Compare your answers to the approximate volumes of a baseball, a volleyball, and a basketball.

Answers: 1

Show answers

Answers

Answer from: akbogg3893

a) Critical mass of 49 kg of Uranium: 2600 cm³b) Critical mass of 16 kg Uranium: 850 cm³

Comparison:

Baseball: 221 cm³Basketball: 7,238 cm³Baseball < Critical mass of 16 kg of uranium < critical mass of 49 kg of uranium < basketball.

Explanation:

To find the volumes of the two samples of uranium alloy, you must use the formula of density:

$Density=\dfrac{mass}{volume}\\\\\\Volume=\dfrac{mass}{density}$

a) Critical mass of 49 kg

First, notice that 18.75g/cm³ is the same that 18.75 kg/dm³ (to convert from grams to kg you must divide by 1,000, and to convert from cm³ to dm³ you must divide by 1,000; thus, dividing both numerator an denominator by the same number leaves the fraction unchanged).

Now you can compute:

$Volume=\dfrac{49kg}{18.75kg/dm^3}=2.6dm^3$

You can convert to cm³ multiplying by 1,000cm³/dm³.

Thus, volume = 2,600 cm³.

b) Critical mass = 16 kg

$Volume=\dfrac{16kg}{18.75kg/dm^3}=0.85dm^3$

Volume = 850cm³

Compare with approximate volumes of a baseball, a volleyball, and a basketball:

You can calculate those volumes by using the formula for the volume of a sphere:

$Volume=\dfrac{4}{3}\pi\times radius^3$

For the baseball: radius ≈ 3.75cm

$Volume=\dfrac{4}{3}\pi\times (3.75cm)^3\approx 221cm^3$

For the basketball radius ≈ 12.0 cm

$Volume=\dfrac{4}{3}\pi\times (12.0cm)^3approx 221cm^3\approx 7,238cm^3$

Thus, the comparison of the volumes is:

Baseball < Crittical mass 16 kg of Uranium 16 kg < Critical mass 49 kg of Uranium < Basketball

Answer from: Quest

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

Answer from: Quest

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

hope i !

Another question on Chemistry

Chemistry, 22.06.2019 02:30

You have a sample of a gas that occupies a volume of 17ml at -111 degrees celsius. what volume does the sample occupy at 88 degrees celsius? show all work asap

Answers: 3

Answer

Chemistry, 22.06.2019 17:10

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth

Answers: 2

Answer

Chemistry, 23.06.2019 03:00

Use the half-reactions of the reaction au(oh)3 + hi -> au +i2 +h2o to answer the questions

Answers: 1

Answer

Chemistry, 23.06.2019 07:00

Explain what happened when the storm surges from hurricanes reached the gulf coast

Answers: 1

Answer

You know the right answer?

A particular uranium alloy has a density of 18.75 g/cm3. Please answer the following questions below...