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Dmitrij [34]
3 years ago
7

How does the city filter our drinking water?

Chemistry
2 answers:
FromTheMoon [43]3 years ago
8 0
By using a filter. Lol
pantera1 [17]3 years ago
7 0
Water purification is the process of removing undesirable chemicals, biological contaminants, suspended solids and gases from contaminated water. The goal is to produce water fit for a specific purpose. Most water is disinfected for human consumption (drinking water), but water purification may also be designed for a variety of other purposes, including fulfilling the requirements of medical, pharmacological, chemical and industrial applications. The methods used include physical processes such as filtration, sedimentation, and distillation; biological processes such as slow sand filters or biologically active carbon; chemical processes such as flocculation and chlorination  and the use of electromagnetic radiation such as ultra violet light.
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A toothpaste contains sodium fluoride (NaF) What percentage of Fluoride is present.(4cs)
MariettaO [177]

Answer:

45.2%

Explanation:

To calculate the percent of an element in a compound we divide the molar mass of the element by the compound and multiply that by 100

First lets find the molar mass of Fluoride

Looking at the periodic table Fluoride has a molecular mass of 18.998 g

Now we need to find the molecular mass of NaF

Looking at a periodic table, Sodium (Na) has a molecular mass of 22.990g and Fluoride has a molecular mass of 18.998 so NaF has a molecular mass of 22.990(1) + 18.998(1) = 41.988g

Now we divide the mass of fluoride by the mass of sodium fluoride and multiply that by 100 to find the percentage of fluoride that is present in NaF

Mass of Fluoride = 18.998g

Mass of Sodium Fluoride = 41.988g

Percentage of fluoride present in NaF = (18.998g / 41.988g) * 100 = 45.2%

7 0
3 years ago
How many kilometers are in a 5.44 mile race
german

Answer: 8.754831

Explanation:

4 0
3 years ago
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A community needs more electrical energy. The community is located in an
alisha [4.7K]

Answer:

Hydroelectric

7 0
3 years ago
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Convert 3.9x10^5mg to dg
bonufazy [111]
Thank you for posting your math problem here. To convert 3.9x10^5mg to dg the answer is <span>3.9 x 10^3 dg. Below is the solution: 

Solution:

</span><span>1mg=0.01dg 
</span><span> dg= 3.9 X 10^5mg
</span>dg = <span>(3.9 X 10^5) x 0.01
dg = </span><span>3.9 x 10^3 </span>
7 0
3 years ago
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If 6.0 x 10^23 atoms of aluminum weigh 27 g, calculate the mass of 1 atom of aluminum in picograms.
Georgia [21]

Answer:

4.5 \times 10^{ - 11} picograms

Explanation:

Please see attached picture for full solution.

3 0
3 years ago
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