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Juliette [100K]
3 years ago
14

Of the following, which is most likely to result after a farmer sprays his crops with pesticides?

Chemistry
2 answers:
Marysya12 [62]3 years ago
7 0

The correct options are as follows:

1. D.

Pesticides are chemicals that are used by farmers to eliminate pests that are destroying their crops. Pesticides comes in various form and the methods used to apply them vary. Some of the pesticides are apply directly to the soil, in this case, the pesticide can move into the water level of the area and contaminate the water source in that environment. If this happens, the water source in that area will test positive for pesticides.

2. A

Due to different human activities, the quantity of carbon dioxide that is available in the atmosphere these days has increase tremendously and this in turn has result in the amount of carbon dioxide that get dissolved in different water bodies, leading to the acidification of the water, which is unhealthy for the organisms living in the water. Also, carbon dioxide increase in the atmosphere leads to global warming, which leads to increase in the temperature of water bodies. The higher the temperature of the water bodies, the higher the quantity of carbon dioxide that get dissolved in the water. Dissolution of CO2 in water leads to water acidification, which can lead to fish kill.

Anastasy [175]3 years ago
6 0
Of the following, which is most likely to result after a farmer sprays his crops with pesticides?D. A neighbor’s well tests positive for pesticides. 

Carbon dioxide is a colorless, odorless gas. Why is it considered a pollutant? 
A. It gets into natural waters and kills fish.
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For some hypothetical metal the equilibrium number of vacancies at 750°C is 2.8 × 1024 m−3. If the density and atomic weight of
mash [69]

Answer:

The correct answer is 5.447 × 10⁻⁵ vacancies per atom.

Explanation:

Based on the given question, the at 750 degree C the number of vacancies or Nv is 2.8 × 10²⁴ m⁻³. The density of the metal is 5.60 g/cm³ or 5.60 × 10⁶ g/m³. The atomic weight of the metal given is 65.6 gram per mole. In order to determine the fraction of vacancies, the formula to be used is,  

Fv = Nv/N------ (i)  

Here Nv is the number of vacancies and N is the number of atomic sites per unit volume. To find N, the formula to be used is,  

N = NA×P/A, here NA is the Avogadro's number, which is equivalent to 6.022 × 10²³ atoms per mol, P is the density and A is the atomic weight. Now putting the values we get,  

N = 6.022 × 10²³ atoms/mol × 5.60 × 10⁶ g/m³ / 65.6 g/mol

N = 5.14073 × 10²⁸ atoms/m³

Now putting the values of Nv and N in the equation (i) we get,  

Fv = 2.8 × 10²⁴ m⁻³ / 5.14073 × 10²⁸ atoms/m^3

Fv = 5.44669 × 10⁻⁵ vacancies per atom or 5.447 × 10⁻⁵ vacancies/atom.  

4 0
3 years ago
The need for energy, gained by respiration and photosynthesis, is the driving force of the oxygen cycle. Please select the best
MariettaO [177]
The answer is T - true.
5 0
3 years ago
Read 2 more answers
Which factors affect electronegativity?
Vitek1552 [10]
I think it’s C atomic radius and numbers of unshielded protons
7 0
3 years ago
Read 2 more answers
What is the concentration of OH − and pOH in a 0.00066 M solution of Ba ( OH ) 2 at 25 ∘ C? Assume complete dissociation.
Allushta [10]

<u>Answer:</u> The hydroxide ion concentration and pOH of the solution is 1.32\times 10^{-3}M  and 2.88 respectively

<u>Explanation:</u>

We are given:

Concentration of barium hydroxide = 0.00066 M

The chemical equation for the dissociation of barium hydroxide follows:

Ba(OH)_2\rightarrow Ba^{2+}+2OH^-

1 mole of barium hydroxide produces 1 mole of barium ions and 2 moles of hydroxide ions

pOH is defined as the negative logarithm of hydroxide ion concentration present in the solution

To calculate pOH of the solution, we use the equation:

pOH=-\log[OH^-]

We are given:

[OH^-]=(2\times 0.00066)=1.32\times 10^{-3}M

Putting values in above equation, we get:

pOH=-\log(1.32\times 10^{-3})\\\\pOH=2.88

Hence, the hydroxide ion concentration and pOH of the solution is 1.32\times 10^{-3}M  and 2.88 respectively

3 0
3 years ago
Identify the correct mole ratio for each substance. Sodium chloride (NaCl) Na:Cl = 1: Ammonium nitrate (NHNO) H:O = 4:
Norma-Jean [14]

<u>Answer:</u> The mole ratio of H : O in ammonium nitrate is 4 : 3.

<u>Explanation:</u>

We are given a compound named ammonium nitrate having formula NH_4NO_3

There are 3 elements in this compound which are nitrogen, hydrogen and oxygen.

To calculate the mole ratio, we write the ratio of their subscripts. For this compound, it is:

N:H:O::2:4:3

The mole ratio of H and O for this compound is 4 : 3.

4 0
3 years ago
Read 2 more answers
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