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3 years ago

Why is DDT a dangerous environmental pollutant?

Chemistry

2 answers:

labwork [276]3 years ago

8 0

Answer:

Because it takes a very long time to degrade, in addition to being a general pesticide, that is, it is capable of killing pests, but also killing the fauna and flora of a region.

Explanation:

DDT stands for Dichloro-Diphenyl-Trichloroethane, a powerful and inexpensive pesticide that was widely used during WW2 to combat insect pests.

DDt is highly polluting and dangerous for the environment. This is because it is a generalist pesticide, that is, it does not act only in the extermination of pests, but it manages to kill any and all living organisms in the region where it is applied, which results in the death of the fauna and flora of a region. In addition, DDT spends a long period of time to be degraded and can remain active in nature for up to 30 years, which causes it to accumulate in soil and water, causing pollution and more deaths.

oksano4ka [1.4K]3 years ago

5 0

DDT was one of the first chemicals in widespread use as a pesticide.
Food supplies: USDA found DDT breakdown products in 60% of heavy cream samples, 42% of kale greens, 28% of carrots and lower percentages of many other foods.Body burden: DDT breakdown products were found in the blood of 99% of the people tested by CDC.Health impacts: Girls exposed to DDT before puberty are 5 times more likely to develop breast cancer in middle age, according to the President’s Cancer Panel.

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In what type of reaction or process does heat flow into the system

SCORPION-xisa [38]

Answer: The correct answer is: " endothermic . "

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Note: Heat flows into [heat may be absorbed within] an "endothermic" reaction or system

To the contrary, heat flows out  [heat may exit from or may be released from] an "exothermic" reaction or process.

Hint: Think of the "prefixes" of: "endothermic" and "exothermic" :

_____________________________________

1) endo- = "within" (as in "endothermic" —heat tends to be absorbed/"within"/"released within"/released within"/into" ;

2) exo- = " outwards"/"exit" (as in "exothermic") —heat tends to '"exit"/leave/escape from/"be released out of/form".

_____________________________________

Hope this is helpful to you!

Best wishes to you in your academic pursuits

—and within the "Brainly" community"!

_____________________________________

5 0

3 years ago

One of the steps in processing some metals is smelting. what does smelting do for a metal?

vichka [17]

Hey there,
Smelting's main use is to produce a base metal from its ore

Hope this helps :))

~Top

8 0

3 years ago

Colorful fireworks often involve the decomposition of barium nitrate and potassium chlorate and the reaction of the metals magne

Fynjy0 [20]

Fireworks owe their colors to reactions of combustion of the metals present. When Mg and Al burn, they emit a white bright light, whereas iron emits a gold light. Besides metals, oxygen is necesary for the combustion. The decomposition reactions of barium nitrate and potassium chlorate provide this element. At the same time, barium can burn emitting a green light.

(a) Barium nitrate is a salt formed by the cation barium Ba²⁺ and the anion nitrate NO₃⁻. Its formula is Ba(NO₃)₂. Potassium chlorate is a salt formed by the cation potassium K⁺ and the anion chlorate ClO₃⁻. Its formula is KClO₃.

(b) The balanced equation for the decomposition of potassium chloride is:

2KClO₃(s) ⇄ 2KCl(s) + 3O₂(g)

Ba(NO₃)₂(s) ⇄ BaO(s) + N₂(g) + 3O₂(g)

(d) The balanced equations of metals with oxygen to form metal oxides are:

2 Mg(s) + O₂(g) ⇄ 2 MgO(s)

4 Al(s) + 3 O₂(g) ⇄ 2 Al₂O₃(s)

4 Fe(s) + 3 O₂(g) ⇄ 2 Fe₂O₃(s)

5 0

3 years ago

The Development and Characterization of Carbon Nanofiber/Polylactic Acid Filament for Additively Manufactured Piezoresistive Sen

horrorfan [7]

Compared to carbon nanotube, carbon nanofiber (CNF) is a unique quasi-one-dimensional nanostructure with a lot of edges and flaws (CNT). Additionally, their low cost and wide availability make them a valuable nanomaterial for upcoming technology.

<h3>what are the development and characterization of Carbon Nanofiber for Additively Manufactured Piezo resistive Sensors?</h3>

In accordance with the semiconductor material's piezo resistive effect, diffusion resistance is used to manufacture piezo resistive sensors on substrates of semiconductor materials. The diffusion resistor is connected in the substrate in the form of a bridge, allowing the substrate to be employed directly as a measuring sensor element.

Carbon nanofiber/polylactic acid filament for fused filament fabrication (FFF) and additive manufacturing (AM) strain sensors was studied for the effects of production factors.
To investigate the effects of CNF weight fraction, extrusion temperature, and number of extrusions on sensor performance, a design of experiments (DOE) approach was used. In the initial extrusion, dry melt mixing was used to combine CNFs and powdered PLA material.
Through the DOE procedure, it was discovered that extruding CNF/PLA material for two complete extrusions at 185 °C resulted in material with material with material with dramatically improved electrical characteristics in comparison to unmodified material.
Piezoresistive dog-bone shaped sensors were made using the best manufacturing technique using three different sizes of 5.0, 7.5, and 10.0 wt% CNF/PLA filament.

To know more about Carbon nanofiber/polylactic acid check here:brainly.com/question/15913091

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1 year ago

How are mutation affects different?

dsp73

Mutation affects can be different just with changes as small as the substitution of a single DNA building block or nucleotide base with another nucleotide base

6 0

2 years ago