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svp [43]
4 years ago
8

Chemical reactions in which large molecules are built from small molecules are classified as ______ reactions. In contrast, ____

__ reactions involve breaking large molecules down into smaller ones.
Chemistry
1 answer:
Luda [366]4 years ago
6 0
<h2>Exothermic and Endothermic Reaction</h2>

Explanation:

  • Chemical reactions in which large molecules are built from small molecules are classified as exothermic reactions. During these reactions, a huge amount of energy is released.
  • When bonds are formed to attain its stability there is the loss of energy as heat energy.  
  • In contrast, Endothermic reactions involve breaking large molecules down into smaller ones. During this reaction, a large amount of energy is involved.
  • When bonds break to attain its stability there is gain of energy.
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Hello
nordsb [41]

Answer:

The ratio of the number of atoms of gold and silver in the ornament is 197 : 1080.

Explanation:

Let the mass of silver ornament be x.

Mass of gold polished on an ornament = 1% of x= 0.1 x

Moles of silver =\frac{x}{108 g/mol}

Number of atoms = Moles\times N_A

Where : N_A = Avogadro number

Moles of gold =\frac{0.1x}{197 g/mol}

Silver atoms =\frac{x}{108 g/mol}\times N_A

Gold atoms =\frac{0.1x}{197 g/mol}\times N_A

The ratio of the number of atoms of gold and silver in the ornament:

=\frac{\frac{0.1x}{197 g/mol}\times N_A}{\frac{x}{108 g/mol}\times N_A}

= 197 : 1080

3 0
3 years ago
what discovery led to the abandonment of the atomic mass as the determining factor for organizing elements in the periodic table
Ostrovityanka [42]

Answer:

  • <em><u>A. isotopes </u></em>

<em><u></u></em>

Explanation:

The <em>periodic table</em> was organized by Dimitry Mendeleiev by 1869, as he showed the connection between the atomic mass and the properties of the elements.

Nevertheless, the order of some few elements had to be altered because the properties did not follow the order of the atomic masses.

Henry Mosely by 1913 determined that atoms of a same element had different number of neutrons, leading to different atomic masses. These atoms of a same element (with the same number of protons) with different number of neutrons are known as<em> isotopes.</em>

By arranging the elements in increasing order of the number or protons (atomic number), instead of the atomic masses,  all the elements resulted ordered according with a repetitive (periodic) pattern of chemical properties.

4 0
3 years ago
Calculate the pOH in a solution with [H+] =9.8 • 10-3 M
Vsevolod [243]

Answer:

...............................................

Hope this helped.

4 0
3 years ago
1. What is the reactant in alcoholic and lactic-acid fermentation?
miv72 [106K]

Answer: D is ur answer

Hope it helps chu!

Have a good day, My fellow bean UwU

4 0
3 years ago
An example of a radioactive isotope is waht
SCORPION-xisa [38]
Like carbon-12 (C-12) and carbon-14 (C-14). C-12 is not radioactive but C-14 is radioactive. C-14 is radioactive isotope of C-12.
8 0
3 years ago
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