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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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Which solution has a molality of 0.25m nacl?
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Molality can be expressed by moles of solute over kilograms of solvent. The question asks the molality of 0.25m NaCl. 0.25m NaCl is equal to 0.25 moles of NaCl over 1 kg of water.

5 0
3 years ago
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Calculate the mass of water produced when 6.97 g of butane reacts with excess oxygen
andrew-mc [135]
The balanced reaction equation for the combustion of butane is as follows;
C₄H₁₀ + 13/2O₂ ---> 4CO₂ + 5H₂O 
the limiting reactant in this reaction is C₄H₁₀  This means that all the butane moles are consumed and amount of product formed depends on the amount of C₄H₁₀ used up.
stoichiometry of C₄H₁₀ to H₂O is 1:5
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then the number of water moles produced - 0.12 mol x 5 = 0.6 mol
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7 0
3 years ago
In photograph a, a coil of zinc metal is in a solution of sulfuric acid. In photograph b, a yellow solution of sodium chromate i
steposvetlana [31]

In photograph a, a coil of zinc metal is in a solution of sulfuric acid. In photograph b, a yellow solution of sodium chromate is being added to a colorless solution of silver nitrate. What clues in the photographs indicate that a chemical change is probably occurring.

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In photograph b, a yellow solution of sodium chromate is being added to a colorless solution of silver nitrate, that changes the color of the solution to red , that indicates a chemical change.

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bija089 [108]

Answer:

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Explanation:

A molecule is a group of 2 or 3 atoms that are bonded by electrostatic charges.

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Thus, there are 2 atoms of fluorine per molecule of MgF2. In 5.6x10²² molecules:

5.6x10²² molecules MgF2 * (2 atoms Fluorine / 1 molecule MgF2) =

<h3>1.12x10²³ atoms of F</h3>
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Jim poured Diethyl ether into a flask and taped a road flare to it.
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The flask would break, the flare would drop and the ether would light on fire.
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