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kakasveta [241]
3 years ago
8

Study the following reaction carefully. What classification should this reaction have? 4Al + 3O 2 2Al 2 O 3 synthesis decomposit

ion single replacement double displacement
Chemistry
1 answer:
allsm [11]3 years ago
8 0

 4 Al  + 3O₂ →  2Al₂O₃

The  classification  of  above reaction is   synthesis

Explanation

  • Synthesis  reaction is type of  chemical reaction in  which two or  more simple  substance combine to form a more complex  product.  React  may be  elements or compounds.
  • In the reaction above Al   combine   with O₂  to form Al₂O₃  therefore it  is synthesis reaction.

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How many g NaOH should be required to completely react 1.876 g of Copper (II) nitrate?
Doss [256]

\\ \tt\hookrightarrow 2NaOH+Cu(NO_3)_2\longrightarrow 2NaNO_3+Cu(OH)_2

Moles of copper nitrate:-

\\ \tt\hookrightarrow \dfrac{1.876}{187.56}=0.001mol

  • 1mol of Copper nitrate reacts with 2mol NaOH
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Madd of NaOH

\\ \tt\hookrightarrow 0.002(40)=0.08g

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2 years ago
1.9x10^23 atoms of sulfur to grams of sulfur
nevsk [136]

Answer:

see explanation and punch in the numbers yourself ( will be better for your test)

Explanation:

If you are given atoms you need to divide by Avogadro's number 6.022x10^23

then you will have moles of sulfur-- once you have moles multiply by the molar mass of sulfur to go from moles to grams

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3 years ago
Explain how the Rutherford gold foil experiment correctly advanced atomic theory away from the plum pudding model?
Rudiy27

Answer is: Rutherford demonstrate that J.J Thompson's Plum Pudding model was not accurate.

Rutherford theorized that atoms have their charge concentrated in a very small nucleus.

This was famous Rutherford's Gold Foil Experiment: he bombarded thin foil of gold with positive alpha particles (helium atom particles, consist of two protons and two neutrons).  

Rutherford observed the deflection of alpha particles on the photographic film and notice that most of alpha particles passed straight through foil.

That is different from Plum Pudding model, because it shows that most of the atom is empty space.

7 0
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Alex777 [14]
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dimaraw [331]

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