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katovenus [111]
2 years ago
15

Explain some of the benefits and problem associated with the pesticide DDT.

Chemistry
1 answer:
Dafna1 [17]2 years ago
4 0

Some benefits are that DDT helps us grow crops and keeps pests off our crops.

But DDT is harmful to the environment. If it gets into the water ways then if can harm fish and animals that eat the fish such as birds.

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DawdDAWdADdwaadadadawddawd
Ronch [10]

Answer:

yyuuuyytt

Explanation:

ggyhggggg,,,,,,,76yyygtyyhgyyggyuhu ubbububuuh7h7h

4 0
3 years ago
The melting of ice cream is an example of which of the following?
Rus_ich [418]
It is physical change because ? has changed alone not with chemicals
7 0
3 years ago
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How many valence electrons do the halogens possess?
BabaBlast [244]

Answer:

<em></em>

<em></em>

  • <em>The halogens posses </em><u><em>seven </em></u><em>valence electrons</em>

Explanation:

  • <em>Valence electrons </em>are the electrons in the outermost orbitals of the atoms, which are the orbitals with the highest main energy level (principal quantum number).

  • Halogens are the elements of the group 17 of the periodic table: F, Cl, Br, I, At.

  • You can tell the number of valence electrons of the representative elements from the number of the group to which they belong. For the representative elements, the number of valence electrons equal the unit digit of the group number.

        This table summarizes it:

Group number        number of valence electrons

     1                                      1

     2                                     2

    13                                     3

    14                                     4

    15                                     5

    16                                     6

    17                                      7

    18                                      8

  • So, in conclusion, <em>the halogens possess 7 valence electrons.</em>
7 0
3 years ago
A ballon is inflated with 2.42L of helium at a temperature of 27.0°C. When put in the freezer, the volume changes to 2.37L and -
natita [175]

Answer:

838 torr  

Step-by-step explanation:

To solve this problem, we can use the <em>Combined Gas Laws</em>:

p₁V₁/T₁ = p₂V₂/T₂            Multiply each side by T₁

   p₁V₁ = p₂V₂ × T₁/T₂     Divide each side by V₁

      p₁ = p₂ × V₂/V₁ × T₁/T₂

<em>Data: </em>

p₁ = ?;             V₁ = 2.42 L; T₁ =  27.0 °C

p₂ = 754 torr; V₂ = 2.37 L; T₂ =  -8.8 °C

Calculations:

(a) Convert <em>temperatures to kelvins </em>

T₁ = (27.0 + 273.15) K = 300.15 K

T₂ = (-8.8 + 273.15) K = 264.35 K

(b) Calculate the<em> pressure </em>

p₁ = 754 torr × (2.37 L/2.42) × (300.15/264.35)  

p₁ = 754 torr × 0.979 × 1.135

p₁ = 838 torr

5 0
3 years ago
Which of the following is not a state of matter?
LenaWriter [7]
D. round is not a state of matter
8 0
3 years ago
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