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3 years ago

Please help it’s a test due today

Chemistry

2 answers:

tiny-mole [99]3 years ago

7 0

The answer is it takes more force to move the lighter sack C)

ycow [4]3 years ago

5 0

Answer:

c) More force has to be used to lift the heavier sack.

Explanation:

Using more force to lift the heavy sack of rice makes you really tired. Thus it's harder to lift a 100 pound sack of rice than to lift a 5 pound bag of sugar.

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During the discussion of gaseous diffusion for enriching uranium, it was claimed that 235UF6 diffuses 0.4% faster than 238UF6. S

Kay [80]

Answer: The below calculations proves that the rate of diffusion of $^{235}UF_6$ is 0.4 % faster than the rate of diffusion of $^{238}UF_6$

Explanation:

To calculate the rate of diffusion of gas, we use Graham's Law.

This law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows the equation:

$\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}$

We are given:

Molar mass of $^{235}UF_6=349.034348g/mol$

Molar mass of $^{238}UF_6=352.041206g/mol$

By taking their ratio, we get:

$\frac{Rate_{(^{235}UF_6)}}{Rate_{(^{238}UF_6)}}=\sqrt{\frac{M_{(^{238}UF_6)}}{M_{(^{235}UF_6)}}}$

$\frac{Rate_{(^{235}UF_6)}}{Rate_{(^{238}UF_6)}}=\sqrt{\frac{352.041206}{349.034348}}\\\\\frac{Rate_{(^{235}UF_6)}}{Rate_{(^{238}UF_6)}}=\frac{1.00429816}{1}$

From the above relation, it is clear that rate of effusion of $^{235}UF_6$ is faster than $^{238}UF_6$

Difference in the rate of both the gases, $Rate_{(^{235}UF_6)}-Rate_{(^{238}UF_6)}=1.00429816-1=0.00429816$

To calculate the percentage increase in the rate, we use the equation:

$\%\text{ increase}=\frac{\Delta R}{Rate_{(^{235}UF_6)}}\times 100$

Putting values in above equation, we get:

$\%\text{ increase}=\frac{0.00429816}{1.00429816}\times 100\\\\\%\text{ increase}=0.4\%$

The above calculations proves that the rate of diffusion of $^{235}UF_6$ is 0.4 % faster than the rate of diffusion of $^{238}UF_6$

3 0

3 years ago

How many moles of Li would react with 4 moles of MgBr₂ in the reaction

ad-work [718]

Answer:

two may be the answer (2)

3 0

2 years ago

Particles vibrate in a rigid structure and do not move relative to their neighbors.

nydimaria [60]

That would be a description of a solid if that’s what your looking for. If not ask me in the comments:)

4 0

4 years ago

Read 2 more answers

19.5 g O2 is equal to how many moles of O2? _____moles O2

vredina [299]

Explanation:

Molar mass of O2: 32g/mol

Moles of O2 = 19.5 / 32 = 0.609mol

8 0

3 years ago

Students mixed 20 mL of white glue and 20 mL of water in a cup. They added three drops of food coloring to the mixture. Then, 15

Dmitry_Shevchenko [17]

Hi im here to help!

Answer: a chemical reaction occurred because a new substance was formed with new properties!

Explanation: when u mix glue water and borax it forms into a new substance which is a chemical reaction

8 0

3 years ago