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3 years ago

What does Newton’s law of universal gravitation say about the distance between objects? s=been 3 hours still waiting...

Chemistry

1 answer:

andrew-mc [135]3 years ago

5 0

Answer:

Gravitational Force is inversely proportional to the square of distance between the objects

$F\alpha \frac{1}{d^{2}}$

Explanation:

This means if distance is tripled(3 times), then Force reduced to 1/9(square of distance )

If d = 3 ,

$F\alpha \frac{1}{3^{2}}$

$F\alpha \frac{1}{9}$

Then , F reduced to 1/9

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Pachacha [2.7K]

answer: 3.40625 moles

Explanation: see the attached pics

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2 years ago

Which statement explains the method to adjust the strength of the flame on the Bunsen burner?

Anarel [89]

Answer:

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3 years ago

Why is physical exercise often suggested if you experience an abundance of stress?

scoray [572]

Answer:

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Explanation:

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2 years ago

1) How many molecules are there in 985 mL of nitrogen at 0.0° C and 1.00 x 10-6 mm Hg?

RSB [31]

Answer : The number of molecules present in nitrogen gas are, $3.48\times 10^{13}$

Explanation :

First we have to calculate the moles of nitrogen gas by using ideal gas equation.

$PV=nRT$

where,

P = Pressure of $N_2$ gas = $1.00\times 10^{-6}mmHg=1.32\times 10^{-9}atm$ (1 atm = 760 mmHg)

V = Volume of $N_2$ gas = 985 mL = 0.982 L (1 L = 1000 mL)

n = number of moles $N_2$ = ?

R = Gas constant = $0.0821L.atm/mol.K$

T = Temperature of $N_2$ gas = $0.0^oC=273+0.0=273K$

Now put all the given values in above equation, we get:

$(1.32\times 10^{-9}atm)\times 0.982L=n\times (0.0821L.atm/mol.K)\times 273K$

$n=5.78\times 10^{-11}mol$

Now we have to calculate the number of molecules present in nitrogen gas.

As we know that 1 mole of substance contains $6.022\times 10^{23}$ number of molecules.

As, 1 mole of $N_2$ gas contains $6.022\times 10^{23}$ number of molecules

So, $5.78\times 10^{-11}$ mole of $N_2$ gas contains $(5.78\times 10^{-11})\times (6.022\times 10^{23})=3.48\times 10^{13}$ number of molecules

Therefore, the number of molecules present in nitrogen gas are, $3.48\times 10^{13}$

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2 years ago

Give the nuclear symbol for the isotope of beryllium for which a=10? enter the nuclear symbol for the isotope (e.g., 42he).

galben [10]

An isotope is defined as an element that has the same number of protons as the common element but different number of neutrons. In this case, a beryllium atom has a molar weight of 10 amu. Thus, there are 4 protons and 6 neutrons. The nuclear symbol of Be-10 is 4 Be10

8 0

2 years ago