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Tamiku [17]
3 years ago
11

Democritus contributed to our understanding of the atom in which of the following ways?

Chemistry
2 answers:
Marianna [84]3 years ago
7 0
I believe the answer is 3 - He hypothesized that all substances can be broken down into a smallest part called the atom. 
Novosadov [1.4K]3 years ago
5 0

Answer:

He hypothesized that all substances can be broken down into a smallest part called the atom.

Explanation:

done the topic

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What is the formula of Potassium oxide??​
Mashutka [201]
<h3>♫ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ♫</h3>

➷ The formula for Potassium oxide is K2O

This is because potassium has a 1+ charge and the oxygen has a 2- charge. Two potassium atoms are required to balance the charge.

<h3><u>✽</u></h3>

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5 0
3 years ago
Read 2 more answers
If I have 0.725 moles of gas at a temperature of 105 K and a pressure of 3.75 atmospheres, what is the volume of the gas?
iVinArrow [24]

If I have 0.725 moles of gas at a temperature of 105 K and a pressure of 3.75 atmospheres the volume of the gas 1.66 litres.

Explanation:

Data given:

number of moles of the gas = 0.725

temperature = 105 K

pressure = 3.75 atm

volume of the gas =?

R = 0.08206 Latm/mole Kelvin

Applying the ideal gas law to calculate the volume of the given gas:

PV = nRT

rearranging the equation to calculate volume:

V = \frac{nRT}{P}

putting the values in the equation:

V = \frac{0.08206 X 0.725 X 105}{3.75}

V = 1.66 Litres.

At a temperature of 105 K and pressure of 3.75 atm, 0.725 moles of gas occupy 1.66 litres of volume.

6 0
3 years ago
How many grams of nano3 would you add to 500g of h2o in order to prepare a solution that is 0.500 molal in nano3?
VARVARA [1.3K]
When the concentration is expressed in molality, it is expressed in moles of solute per kilogram of solvent. Since we are given the mass of the solvent, which is water, we can compute for the moles of solute NaNO3.

0.5 m = x mol NaNO3/0.5 kg water
x = 0.25 mol NaNO3

Since the molar mass of NaNO3 is 85 g/mol, the mass is

0.25 mol * 85 g/mol = 21.25 grams NaNO3 needed
4 0
3 years ago
Witch is the best discription of a molecule
horsena [70]
The component parts of a compound that can ever exist and still retain the chemical properties of that compound
7 0
4 years ago
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Write 0.000000093425 in Scientific Notation with 4 significant figures.
Romashka-Z-Leto [24]

<u>Answer:</u> The given number in scientific notation is 9.342\times 10^{-8}

<u>Explanation:</u>

Scientific notation is the notation where a number is expressed in the decimal form. This means that the number is always written in the power of 10 form. The numerical digit lies between 0.1.... to 9.9.....

If the decimal is shifting to right side, the power of 10 is negative and if the decimal is shifting to left side, the power of 10 is positive.

We are given:

A number having value = 0.000000093425

Converting this into scientific notation, we get:

\Rightarrow 0.000000093425=9.342\times 10^{-8}

Hence, the given number in scientific notation is 9.342\times 10^{-8}

6 0
4 years ago
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