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wlad13 [49]
2 years ago
10

Why fluorine is often added to drinking water and toothpaste

Chemistry
2 answers:
prisoha [69]2 years ago
5 0
As someone said it does reduce tooth decay but also keeps your teeth from a certain substance that is found in lead and stuff
chubhunter [2.5K]2 years ago
4 0
<span>Fluoride is often added to drinking water to help reduce tooth decay

Also for toothpaste to help prevent tooth decay 
</span>
Better Bush

I hope I helped

ΩΩΩΩΩΩΩΩΩΩ 
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Which physical change is endothermic?
Helen [10]

Answer: The correct option is 1.

Explanation: Endothermic reactions are the reactions in which heat is provided to break down the reactant molecules.

In option 1:

The stronger intermolecular forces between the particles in solid molecule are broken down to convert into gaseous form. Hence, some energy in the form of heat is provided to move them far apart. Therefore, it is considered as an endothermic reaction.

In option 2, 3 and 4:

All the other processes involves the formation of bonds and thus there is no need to provide any energy.

5 0
3 years ago
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What is the percent composition HCN?
kupik [55]

Answer:

see calculations in explanation

Explanation:

percent = part/total x 100%

part = ∑ atomic mass of element

  • hydrogen = 1.008 amu (atomic mass units)
  • carbon = 12.011 amu
  • nitrogen = 14.007 amu

total = ∑ molecular mass of compound

       = H amu  +  C amu +  Namu

       = 1.008 amu + 12.011 amu + 14.007 amu

       = 27.026 amu

%H = (1.008amu/27.026amu)100% = 3.730%

%C = (12.011amu/27.026amu)100% = 44.442%

%N = (14.007amu/27.026amu)100% = 51.827%

Check results ∑%values = 100%

3.730% + 44.442% + 51.827% = 99.999% ≅ 100%

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3 years ago
Question about thermodynamics
Fiesta28 [93]

Answer:

Thermodynamics is the branch of physics that deals with the relationships between heat and other forms of energy.

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The landscape region  of Long Island is the Atlantic coastal plain.

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What is the central atom of C2H4Br2
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