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Liula [17]
4 years ago
8

The volume of a 12.4 g metal pellet is measured by water displacement. It is added to a graduated cylinder filled with water, an

d the level rises from 10.00 mL to 13.65 mL. What is the density of the metal?
Chemistry
1 answer:
Vesna [10]4 years ago
5 0

Answer:

                3.39 g.mL⁻¹ or 3.39 g.cm⁻³

Solution:

Data Given:

                             Mass of Pellet  =  12.4 g

                             Volume of Pellet  =  13.65 mL - 10.00 mL  =  3.65 mL

                             Density  =  ?

Formula Used,

                             Density  =  Mass ÷ Volume

Putting values,

                             Density  =  12.4 g ÷ 3.65 mL

                             Density =  3.39 g.mL⁻¹ or 3.39 g.cm⁻³

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Anna35 [415]

Water pollution is defined as the mixing of water with unwanted substances and that makes water unsafe.

Water pollution includes runoff of excess fertilizers,

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and residential areas; oil, grease, and toxic chemicals

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sediment from improperly managed construction sites,

crop and forest lands, and eroding stream banks.

Polluted waters have high BOD which affects aquatic biodiversity.

Hpotoxic substances such as lead, arsenic, and fluoride cause many problems to aquatic animals and humans. Water contaminated with Arsenic results in diseases such as arsenicosis. Fluoride had been reported to cause depression in DNA and RNA synthesis in cultured cells, significant reductions in DNA and RNA levels, and conditions including aging, cancer, and arteriosclerosis are associated with DNA damage and its disrepair. Lead causes problems related to the central nervous system. Children and pregnant women are most at risk. Routine applications of fertilizers and pesticides for agriculture and uncontrolled runoff in water bodies. Adds nitrogen and phosphorus to water. It adds nitrogen and phosphorus to water causing eutrophication and algal blooms.

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8 0
2 years ago
The half-life of radium-226 is 1590 years. if a sample contains 100 mg, how many mg will remain after 1000 years?
Katyanochek1 [597]

Answer:

a=64.7mg

Explanation:

Hello,

In this case, we need to remember that for the required time for a radioactive nuclide as radium-226 to decrease to one half its initial amount we are talking about its half-life. Furthermore, the amount of remaining radioactive material as a function of the half-lives is computed as follows:

a=a_0(\frac{1}{2} )^{\frac{t}{t_{1/2}} }

Therefore, for an initial amount of 100 mg with a half-life of 1590 years, after 1000 years, we have:

a=100mg(\frac{1}{2} )^{\frac{1000years}{1590years} }\\\\a=64.7mg

Best regards.

4 0
3 years ago
When preparing the diazonium salt, the solution is tested with potassium iodide-starch paper. a positive test is the immediate f
Dahasolnce [82]
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3 years ago
21. Apply Concepts Classify each reaction and balance the
adell [148]

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4 0
1 year ago
How many molecules units are in 4.5 moles of CF4
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= 2.709x10²⁴ molecules units
7 0
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