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lina2011 [118]
3 years ago
9

The first time scientists actually saw an atom was

Chemistry
1 answer:
-BARSIC- [3]3 years ago
6 0
<span>John Dalton was the first person to see an adam after Democritus theorized i</span>
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How do elements differ going from left to right across a period on the periodic table?
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Their atomic number increases
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2 years ago
What type of solid is candle wax
son4ous [18]

Hi Sara


I would say it is an amorphous solid.


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3 years ago
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What is the molecular formula for water?
Alexxandr [17]

Answer:

H2O

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5 0
2 years ago
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PLZ HELP!!!!!!!!!!!!!
gregori [183]

117.22 g are needed to react with an excess of Fe2O3 to produce 156.2 g of Fe.

Explanation:

                  Moles of Fe = Mass of Fe in grams / Atomic weight of Fe

                                        = 156.2 / 55.847

                  Moles of Fe  = 2.79.

The ratio between CO and Fe id 3 : 2.

                  Moles CO needed  = 2.79 * (3 / 2)

                                                   = 4.185.

 To calculate Atomic weight of CO,

                  Atomic weight of carbon = 12.011

                  Atomic weight of oxygen= 15.9994

        Atomic weight of CO = 12.011 + 15.9994 = 28.01 g / mol.

                 Mass of CO   = 4.185 * 28.01 = 117.22 g.      

5 0
2 years ago
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