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ss7ja [257]
3 years ago
9

DDT is currently banned worldwide. a. True b. False

Chemistry
1 answer:
Aleks [24]3 years ago
5 0
B. False. It is banned worldwide for agricultural uses. The <span>use of DDT is still authorized in small proportions in countries that need it, with support deployed for the alteration to safer and more effective alternatives.</span>
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Can you add more points to question pls
Zarrin [17]

what do you mean? explain what you r trying to dsay


3 0
4 years ago
A rabbit has a mass of 2kg. What is its weight
kvasek [131]

Answer:

weight = mg

= 2 X 9.8 (g = 9.8m/s^2)

= 19.6 N is the correct answer

3 0
3 years ago
Read 2 more answers
As with any combustion reaction, the products of combusting a hydrocarbon fuel (CxHy) with oxygen (O2) are carbon dioxide (CO2)
melisa1 [442]

<u>Answer:</u>

<em>5 molecules of oxygen will be present </em>

<u>Explanation:</u>

<em>In this reaction combustion is taking place hence there must be presence of oxygen in it. </em>

We don't know the initial amount of carbon molecules in hydrogen molecules present hence the equation goes:-

CxHy + O_2 => CO_2+ H_2O

Mass of  fuel 16.74 grams, Mass of carbon dioxide is 1198 gram and water is 0.0654 remaining mass of  fuel is 16.70 g.  Hence amount of fuel used up is 0.04 gram  

<em>0.04 + O => 0.1198 + 0.0654</em>

<em>Weight of products is 0.1852 and weight of oxygen is 0.1452 </em>

<em>No of molecules will be \frac {(0.1452 \times 6.023 \times 10^-^2^3)}{ (1.661 \times 10^-^2^4)} = 5molecules </em>

3 0
4 years ago
An analytical chemist is titrating of a solution of ammonia with a solution of . The of ammonia is . Calculate the pH of the bas
harina [27]

Answer: The question has some details missing. here is the complete question ; An analytical chemist is titrating 88.4 mL of a 0.2700 M solution of ammonia (NH3 with a 0.4300 M solution of HNO3. The pK, of ammonia is 4.74 Calculate the pH of the base solution after the chemist has added 66.3 mL of the HNO3 solution to it . Note for advanced students: you may assume the final volume equals the initial volume of the solution plus the volume of HNO3 solution

Explanation:

Given ;

  • number of moles of base = 88.4 x 0.2700 = 23.868
  • number of moles of acid = 0.4300 x 66.3 = 28.509
  • This was after the equivalence point, as such net moles of acid = 28.509 - 23.868 = 4.641mol
  • total volume of solution = 88.4 + 66.3 = 154.7mL
  • Concentration of Acid = moles/volume = 4.641/154.7 = 0.03M
  • From pH = -log[H^+] = -Log[0.03]
  • pH = 1.52

7 0
4 years ago
What kind of elements separate the metals from the nonmetals on the periodic table of elements?
galina1969 [7]

Answer: Metalloids

Explanation:

The dark “stair step” line on the right side of the periodic table is where the metalloids are. Metalloids “touch” the SSL. (Stair step line)

The metals are to the left of the SSL and the non metals are to the right of the SSL.

5 0
3 years ago
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