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IgorLugansk [536]
3 years ago
15

Copernicus believed the planetary motions were due to:

Chemistry
1 answer:
RSB [31]3 years ago
6 0

Answer:circular heliocentric orbits.

Explanation:

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Which of the following involves a chemical reaction?
Andrews [41]
A combustion involves a chemical reaction.
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3 years ago
What is the half life of an atom that goes from 16000 g to 125 g in 163.24 days.
Alenkinab [10]

Answer:

23.32\ \text{days}

Explanation:

N = Final mass of atom = 125 g

N_0 = Initial mass of atom = 16000 g

t = Time taken = 163.24 days

t_{1/2} = Half life

We have the relation

N=N_0\dfrac{1}{2}^{\dfrac{t}{t_{1/2}}}\\\Rightarrow 125=16000\times \dfrac{1}{2}^{\dfrac{163.24}{t_{1/2}}}\\\Rightarrow \dfrac{125}{16000}=\dfrac{1}{2}^{\dfrac{163.24}{t_{1/2}}}\\\Rightarrow \ln0.0078125=\dfrac{163.24}{t_{1/2}}\ln0.5\\\Rightarrow t_{1/2}=\dfrac{163.24\times\ln0.5}{\ln0.0078125}\\\Rightarrow t_{1/2}=23.32\ \text{days}

The half life of the atom is 23.32\ \text{days}.

3 0
3 years ago
7) Calculate the number of moles of Chlorine gas if 50.0L of the gas is at 0.50atm of pressure at 400K.
Ostrovityanka [42]

Answer:

so i never did this befor so i am sorry hope you get the answer

Explanation:

7 0
3 years ago
What is the ph of 0.05l of hand soap? is it acidic or basic?
kari74 [83]
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7 0
2 years ago
A chemist prepares a solution of silver(II) oxide by measuring out 0.0013 of silver(II) oxide into a 100 mL volumetric flask and
azamat

Answer:

1.3x10⁻⁸ mol/L

Explanation:

<em>0.0013μmol, Calculate concentration in mol/L</em>

<em />

To obtain concentration in mol/L we need to convert the μmoles to moles and mL to liters:

<em>Moles silver(II) oxide:</em>

0.0013μmol × (1mol / 1x10⁶μmol) = 1.3x10⁻⁹ moles

<em>Liters solution:</em>

100mL * (1L / 1000mL) = 0.1L

That means concentration in mol/L is:

1.3x10⁻⁹ moles / 0.1L =

<h3>1.3x10⁻⁸ mol/L</h3>
6 0
3 years ago
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