What lead to the discontinued use of DDT? What were its effects on people? Nature? People- Nature-

Answers

Answer 1
My big dixk jkjejdjjdjjdjdjdjdjdjdjf

Related Questions

how are protons and neutrons found?

Answers

Answer:

Electrons are found in shells or orbitals that surround the nucleus of an atom. Protons and neutrons are found in the nucleus. They group together in the center of the atom.

Explanation:

I'm not sure if this is correct but I hope this helps.

Which is more viscous - petrol or diesel?

Answers

Answer:

Petrol....

follow me and mark me brainliest

Answer The answer to this question is diesel.

Explanation:

Hi there, hope this helps!

Which property is a physical property?
A:malleable
B:becomes moldy quickly
C:easy to digest
D:does not burn

Answers

I think the answer is b

Answer:

The answer is B. Becomes moldy quickly.

Explanation:

This is the most logical answer out of all of them an I took the test.

If I fill a tall glass with water and then transfer the water to a shorter glass, it appears there is more water. Is there more water?

Answers

No, there is not more water. It just appears this way because the new glass is smaller and the water takes up more room in it than it did in the larger glass.

What are some tips *from a girl* to get a girl to like you without making it obvious

Answers

just be nice, and compliment her
Ok to me this something you got to figure out on your own because not every girl is the same, take me for example i don’t care for anybody like or who likes me being nice i like them aggressive and honest but with like 10% of nice but not all time so i hope i could help you!

Please answer this question, I will give brainliest! You fill a 2.0 L metal thermos with gas at room temperature (25.0 ˚C) and 1.0 atm. Put it in the freezer and the temperature drops to -15.0 ˚C. A. What is the pressure inside the thermos after it cools, in atm? Justify your answer. B. . … and what is that pressure in mmHg?

Answers

e temperature of a 0.750 L gas sample at 25°C and 2.00 atm is changed to 250°C.

Radar detectors use radio waves to measure the speed of moving
vehicles. Radar detectors have a wavelength of 1.8 meters. What is the frequency of waves from a radar detector?

Answers

Answer:

1.7x10^8 Hz

Explanation:

Frequency could be explained as the number of occurrences of a repeating event at a time

Given:

wavelength = 1.8 meters

The frequency f of the waves can be calculated using f = c / λ

Where c (m/s) is the speed of the wave

λ (m) is the wavelength

Speed c= 3*10^8 m/s

Frequency f= 3*10^8 /1.8

Frequency= 1.7x10^8 Hz

Therefore,the frequency of waves from a radar detector is 1.7x10^8 Hz

Do you think the density of the rock models affects the melting rate? Why or why not? I said no, but I need help on the part that says why or why not. Please use your own knowledge. Looking it up won't help. I have tried. :)

Answers

Answer:

1) Yes the density does affect it's melting rate.

Explanation:

Simply because the more rock the more time. For instance an ice cube that is empty inside ( has less density ) will take less to melt. Verses an ice cube that is ice to its inner core ( has more density ) will take more time to melt in the same temperature as the first ice cube.

Atoms of hydrogen can become helium atoms during a chemical reaction.
True
False

Answers

Answer:

false

in chemical reaction element doesnot change into another

Explanation:

Falsee

Can’t change into another.

Find the probability that 200 tosses of a coin will result in (a) between 80 and 120 heads inclusive, (b) less than 90 heads,(c)less than 95 heADS (D) EXACTLY 100 heads

Answers

Answer:

between 80 to 120

Explanation:

because it would be around 100 but it can't be exact.

In coulombs, how much positive charge is there IN a barium nucleus? On a barium ion?

Answers

Answer:

The amount of positive charge in a barium nucleus is approximately 8.972 × 10⁻¹⁸ coulomb

Explanation:

The amount of positive charge there is in a barium nucleus is found as follows;

The atomic number of an element is equal to the number of proton present in the atom

The atomic number of barium = 56 = The number of protons in an atom of barium

The positive charge of a single proton is known as an elementary charge, e, given by the formula, e = F/N[tex]_A[/tex]

Where;

F = Faraday's constant

N[tex]_A[/tex] = The Avogadro's number

Therefore, e = 1.602 176 634 × 10⁻¹⁹ C

Which gives the positive charge, Q, of the protons of a barium nucleus as follows;

Q = Number of protons × e

Q = 1.602176634 × 10⁻¹⁹ × 56 ≈ 8.972 × 10⁻¹⁸ Coulomb  per atom of barium.

The amount of positive charge in a barium nucleus ≈ 8.972 × 10⁻¹⁸ coulomb.

Is this atom Reactive (unstable) or Unreactive (stable) ?

Answers

Answer:

The answer is Unreactive.

Explanation:

This is an unreactive atom because it has completely filled out stable electrons in the outer shell.

8 electrons in the outer shell means stable.

A(n) __________________ is a statement of what you think will happen during an investigation. It is often written in the form of an if... Then... Because statement. Group of answer choices

Answers

Answer:

Hypothesis. Hope this helped! :)

Some chemical reactants are listed in the table below. Complete the table by filling in the oxidation state of the highlighted atom.

Answers

Answer:

1. Cu = +2

2. O = – 2

3. C = +2

4. N = 0

Explanation:

Note:

A. The oxidation state of oxygen is always – 2 except in peroxides where it is – 1.

B. The oxidation state of Hydrogen is always +1 except in metallic hydrides where it is – 1.

Now let us solve the question given above.

1. CuO = 0 (ground state)

Cu + O = 0

O = – 2

Cu + (– 2) = 0

Cu – 2 = 0

Collect like terms

Cu = 0 + 2

Cu = +2

2. H2O = 0 (ground state)

2H + O = 0

H = +1

2(1) + O = 0

2 + O = 0

Collect like terms

O = 0 – 2

O = – 2

3. CO = 0 (ground state)

C + O = 0

O = – 2

C + (– 2) = 0

C – 2 = 0

Collect like terms

C = 0 + 2

C = +2

4. N2 = 0 (ground state)

2N = 0

Divide both side by 2

N = 0/2

N = 0

An ionic bond for calcium and oxygen is CaO. If an oxygen ion has a charge of two negative, what is the charge for calcium? +2 –1 +1 –2

Answers

Answer:

+2

Explanation:

2. Which of the following statements correctly explains the difference between a theory and a scientific law?
O Scientific laws are not as well proven as theories.
O Scientific laws are statements about observed experimental facts, while theories are explanations of natural phenomena.
Theories are not as well proven as scientific laws.
O Scientific laws explain natural phenomena while theories are just guesses.

Answers

Answer:

pretty sure its Scientific laws are statements about observed experimental facts, while theories are explanations of natural phenomena.

The statement that correctly explains the difference between a theory and a scientific law is as follows:

Scientific laws are statements about observed experimental facts, while theories are explanations of natural phenomena.

Thus, the correct option is B.

What is Scientific theory?

A Scientific theory may be defined as a well-explained fact that is significantly associated with the natural world that has been constructed through the utilization of the scientific method, and which brings together many facts and hypotheses.

A Scientific theory is based on observation. It is proven but still testable in nature in order to derive evidence. It generally does not possess mathematical statements and deductions. Theories are explained on nature as well as natural phenomena.

Scientific law is based on unalterable facts or those facts that remain constant. It is proven as well as contains evidence to support the claim. It definitely possesses mathematical statements and deductions.

Therefore, the correct option for this question is B.

To learn more about Scientific theories, refer to the link:

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This element has nine more electrons than Technetium

Answers

Answer:

Tellurium

Explanation:

Technetium's position on the periodic table is 43 and Tellurium's is 52

SHOW YOUR WORK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
An experiment was conducted to find the mass of one mole of carbon atoms. The results of the experiment showed that a mole of carbon atoms had a mass of 15.78 g. The accepted value of a mole of carbon atoms is 16.00 grams. What is the percent error in this experiment?

Answers

Answer:

1.375%

Explanation:

Percent Error = measured value - accepted value/ accepted value x 100

Measured Value: 15.78

Accepted Value: 16.00

Work:

[tex]\frac{15.78-16.00}{16.00}[/tex] * 100

[tex]\frac{-.22}{16}[/tex] * 100 = -1.375

You cannot have a negative percentage. Therefore the answer is 1.375%


1. Which statement best describes why a gas is
easily compressible while most solids
are incompressible?
A. The molecules of a gas are much smaller
than those of a solid.
B. The molecules of a solid are not attracted to
one another.
C. The molecules of a gas are much further
apart than those of a solid.
D. The molecules of a solid are much larger
than those of a gas.

Answers

C) The molecules of a gas are much further

apart than those of a solid.

A gas is easily compressible while most solids are incompressible because the molecules of gas are much further apart than those of a solid.

What are gases?

Gases is one of the four fundamental state of matter.

Gases can be defined as phase of matter that neither have fixed shape nor have fixed volume.

The molecules of gases are far apart from each other as compare to other phases of matter.

The change in properties of volume is known as compressibility and those fluid whose volume changes are known as compressible fluids or gases.

The fluids which does not compressed or expanded and its volume remain constant are known as incompressible fluids or gases.

Thus, gas is easily compressible while most solids are incompressible because the molecules of gas are much further apart than those of a solid.

To learn more about gases, refer to the link below:

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A calorimeter made from a can is used to measure the calories in a peanut. During the experiment, the

measured calories were 35% of the true/accepted value given by references

Answers

Answer:

The heat generated per gram of sample in calories is 0.87 g

Explanation:

Given that,

A calorimeter made from a can is used to measure the calories in a peanut.

During the experiment, the  measured calories were 35% of the true/accepted value given by references

Suppose, the mass of peanut is 0.4 g and find the

We need to calculate the heat generated per gram of sample in calories

Using formula of heat generated

[tex]q=\dfrac{q_{penut\ calorimeter}}{m_{peanut}}[/tex]

Put the value into the formula

[tex]q=\dfrac{0.35}{0.4}[/tex]

[tex]q=0.87\ g[/tex]

Hence, The heat generated per gram of sample in calories is 0.87 g

11. Calculate the number of atoms of sodium in a 4.5-gram sample.
A 1.2 x 1023 atoms Na
B 2.5 x 1023 atoms Na
C 1.7 x 10-22 atoms Na
D 3.1 x 1024 atoms Na

Answers

Answer:

A

Explanation:

What is the atomic number of an atom that has 5 neutrons and 4 electrons

Answers

The atomic number is 4.

The atomic number of the given atom is equal to 4.

What is the atomic number?

The atomic number (symbol Z) of a chemical element can be defined as the charge number of an atomic nucleus. For an ordinary atom, the atomic number is equal to the number of protons found in the nucleus of an atom of that element.

The atomic number helps to uniquely identify ordinary chemical elements. In an ordinary uncharged atom or neutral atom, the atomic number of that atom is also equal to the number of electrons.

For a neutral atom, the sum of the atomic number and the neutron number gives the atomic mass. The protons and neutrons have approximately the same mass. Atoms that have the same atomic number but different numbers of neutrons or different mass numbers are known as isotopes.

Given the number of electrons in the atom is 4. Therefore, the atomic number of that atom will be equal to 4.

Learn more about the atomic number, here:

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Which of the following are fluids

Answers

all it says is which of the following are fluids
What are the options

What kind of questions CANNOT be answered by chemistry?

If someone could help me out I would really appreciate it! Thank you!

Answers

Answer:

d. why matter exists

Explanation:

The kind of questions that chemistry CANNOT answer is "why matter exists".

In Chemistry, question of how the properties, composition and structure of substances are is answered. Also, the transformations that these substances undergo, and the energy that they release or absorbe during the transformation processes are revealed in chemistry.

Chemistry can answer the question of what forms of matter exists but cannot answer why matter actually exists.

An ice cream company decides to make a new lower calorie flavor,but testers reported that the flavor wasnt as good as the original.Is this an example of trade off

Answers

Answer:

Yes, the given instance is an example of a trade-off.

Explanation:

The trade-off seems to be a strategy to minimize or surrender one or more favorable results in consideration for increasing either receiving other favorable results to optimize cumulative benefit or efficacy within such conditions.The above is indeed a trade-off since the participants are experimenting in exchange again for ice cream individuals have to enjoy. The ice cream manufacturer always gets a review of the technician in exchange for free ice cream.

Q1.What is the mass of 5 moles Of 1.Mg 2.CaCO3 Q2. Calculate the number of atoms in 10g of Na Q3.calculate the number of molecules in 10g of NaCl Q.4.What is Avogadro's number? How many number of atoms are present in 4g of Oxygen?

Answers

Answer:

Explanation:

Q1) as we know that moles=given mass/molar mass

     mass of 5 moles of Mg is

mass =moles*molar mass

mass=5*24

mass=120 g

mass of 5 moles of CaCO3 is

mass= moles*molar mass

mass=5*100=500

Q2) number of atoms in 10 g Na

first we need number of moles of sodium

moles =mass/molar mass

moles=10/23=0.43

now we know that moles=number of atoms /avogadro number

for number of atom the formula become

number of atom=moles*avogadro number

number of atom=0.43*6.023*10^23=2.6*10^23

Q3)number of molecule in 10 g of NaCl

again we need number of moles of NaCl

moles=given mass/molar mass

moles=10/58.5=0.17

now number of molecules=moles*avogadro number

number of molecules=0.17*6.023*10^23=1.02*10^23

Q4) avogadro number is the number of particles(atoms,molecules,ions) present in one mole of a substance its value is 6.023*10^23

Q5)Number of atoms in 4g of oxygen

again we need number of moles of oxygen

moles=mass/molar mass

moles=4/16=0.25

now number of atoms=moles*avogadro number

number of atoms=0.25*6.023*10^23 =1.5*10^23

To separate a mixture of iron filings and salt, the most efficient method would be

Answers

Answer:

Explanation:

Of course you could do the separation chemically. Dissolve the salt up in water, pass thru a filter, wash the iron filings with ethanol, which would encourage the salt to precipitate from solution.

I do hope I helped you! :)

Answer:

by passing a magnet through the mixture

Explanation:

What does a straight line represent on a distance vs time graph?

Answers

A straight line on a distance va time graph represents constant speed

Answer:

It represents the relationship between the distance travelled and time spent as constant or at a stop.

Explanation:

This is because as the line progresses, the time increases the distance should change as well my moving up or down, in a linear equation this relationship is constand but if the line is horizontal though, the distance is not changing despite time passing which means it has come to a stop.

Please help Which of the following is the SI unit used to measure length? a.kilogram b.liter c.meter d.Kelvin

Answers

Answer :

A. kilogram is the SI unit used to measure mass of body.

1 kilogram = 100 gram

B. litre is the SI unit used to measure volume of substance.

1 litre = 10ˉ³ m³

C. meter is the unit used to measure length of body.

1 meter = 100 centimeters

D. Kelvin is the unit used to measure temperature of body.

1 K = -273.15 °C

Hence, (B) is the correct answer!

Cheers!


1. The density of a substance is 4.8 g/mL. What is the volume of a
sample that is 19.2 g?

Answers

Answer:

d= 4.8g/mL

m= 19.2 g

V=m/d

V= 4 mL

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Why did the stamp act provoke such strong response what is the reciprocal of 15 1/4 Capacity for learning; natural ability 8. Mountains can influence climate through PRACTICE Match each term with its definition. Use a dictionary if you need help.Then choose the term that also has a meaning not related to astronomy andwrite a definition for it.1. apogee2. equinox3. diurnal4. perigee5. eccentrica. two dates each year when day and night are of equal lengthb. having a noncircular planetary orbits such as Earth'sc. point when the moon is farthest from Earthd. relating to the daily rotation of Earthe. point when the moon is closest to Earth Can someone explain/answer this? I think I know the answer but I want to be entirely sure The area of max'ss room ,not incleding his closet is 235.675 square feet the area of his closet is 10.45 square feet what area of his room ,including the closet 1.She ......... come to your birthday party on Saturday but it depends our her parents.1. may. or 2. will able to come.2. My mother bought this for me in the _____ at the airport.1. shop. 2. desk. 3board. 4. duty free shop.3.Take your warm hat and coat with you. It _____ snow in the mountains, you never know.1. may. 2. will. 3. won't. 4. will be able to. 4.I'm sure people _____ travel to other planets in the Next 20 years. 1. might. 2. will be able to.5. When it is time to board the plane, you need to go through______. 1. gate. 2. arrivals gate. 3. departure gate. 4. boarding.6. A lot of people were waiting to go through ______. 1. gate. 2. control. 3 passport control.7.I _____ have another pen. Let me check in my bag.1. will. 2. will be able to have. 3. won't. 4. might.8. I ____ to take my driving test next year.1. can. 2. will be able. Click to review the online content. Then answer the question(s) below, using complete sentences. Scroll down to view additional questions. Online Content: Site 1 Explain what the quipu was and how it was used. What was its drawback? somebody help i gotta headache ... and i just need someone elses opinion. 1/2 _ 5/4which one is greater? What is the value of s in the equation 4(2s - 1) = 75 + 12? M is the midpoint of RT. RM = 5x + 9 and MT = 8x - 36. Find x, RM, MT, and RT. = . Name the sets of numbers to which each number belongs Study the map, and then answer the questions using the drop-down menus. Which mountain range is located at A? Which chain of mountains is the longest in North America? Which mountain range is located at B? What was World War I? is not an ideal research question because:its not relevant to the topic.its too difficult to answer.its not specific enough.there arent too many sources on this topic. which element is loacted in group 17 period 6 13 + 3y= 37 solve for y Explain how you can write an equation for the given situation in standard form. One number is 5 more than a second number. The product of the two numbers is 891. A) Let x be the smaller number, and then x+5 is the larger number. This means that x(x+5)=891, which can be rewritten as x^2+5x-891=0B) Let x be the smaller number, and then x+5 is the larger number. This means that x+(x+5)=891, which can be rewritten as 2x-886=0C) Let x be the smaller number, and then x+5 is the larger number. This means that x(x+5)=891, which can be rewritten as x^2+5x+891=0D) Let x be the smaller number, and then x+5 is the larger number, This means that x+5/x=891, which can be rewritten as 890x-5=0 help me please this means a lot to my grade