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Answer:

See explanation

Explanation:

DDT is dichlorodipphenylrtrichloroethane. It is was a popular insecticide used for agricultural purposes. Racheal Carson's book, silent springs drew attention to the use of insecticides such as DDT in agriculture.

DDT is a non-biodegradable, fat-soluble compound. It enters into the food chain and has the ability to bioaccumulate in the human body where it becomes deposited in the adipose tissue.

There is no direct harmful effect of DDT to humans, however, when oxidation of DDT takes place in body many harmful metabolites  are released into the body causing harmful effects to human health such as; breast cancer, male infertility, miscarriages and low birth weight, developmental delay and liver damage.

There is convincing empirical evidence supporting the carcinogenicity of DDT its main metabolites DDE and DDD, however, many studies on the harm caused by DDT and its main metabolites in the body have so far led to inconclusive, and sometimes negative, results

Answer:

B, 6

Explanation:

Answer: all of the above

Explanation: All the choices listed above can be used to describe liquid

Answer:

box A

Explanation:

10 is bigger than 3 since 10 is bigger it has more force in it

Answer:

Concentration of the detergents

Explanation:

The factor that changes the reaction is the concentration of the reacting detergent.

Here are some factors that influences the rate of reaction;

The reaction rate is directly proportional to the concentration of the reactants.

Here since we have a more concentrated detergent, its reaction rate will be higher than normal and it will wash better.

Answer:

Photic Zone

Explanation:

The photic zone is the uppermost layer of the sea that recieves sunlight allowing phytoplankton to perform photosynthesis.

Answer: Yes.

Explanation:

the number of protons in the nucleus determines an element's identity. Chemical changes do not affect the nucleus, so chemical changes cannot change one type of atom into another. The number of protons in a nucleus does change sometimes, however. The identity of the atom, therefore, changes.

1. 0+15+30+45+60=150/5=30 s

0+10+16+22+27=75/5=15 cm^3

then, 15/30= 0.5 cm^3/s(average rate of rxn)

2. 0+15+30+45+60+75+90+105+120=540/9=60 s

0+10+16+22+27+31.50+36+39.5+42=224/9=24.89cm^3

then, 24.89/60=0.414cm^3/s (avrg rate of rxn)

3. overall rxn add all the time divide by 12 and the volume add them too and divide by 12. after take average volume divide by the average time to get the average rate of overall rxn

4. 16/30= 0.533cm^3/s

5. 39.5/105= 0.37cm^3/s

Answer:

D. Force

Explanation:

Applied force can cause change in direction

A force applied at an angle to the direction of motion of an object can cause it to change direction. It is possible that the object keeps going at the same speed, if the force is applied perpendicular to the direction of motion. But the velocity of the the object changes.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 5 mL

density = 1.5 g/mL

We have

mass = 1.5 × 5

We have the final answer as

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Answer:

2

Explanation:

33-25=8

48/8=6

The density (g/cm3) of 48.0 g of a metal if the level of water in a graduated cylinder rises from 25.0 mL to 33.0 mL after the metal is added density will be 6.0 g/cm3. option B is correct.

The density of any substance is the division of the mass of the given substance to the volume of the given substance and its unit is centimeter cube.

where,

density = mass of substance / volume of the substance

            mass of substance = 48.0 g

            volume of substance =  33.0  - 25.0 = 8 ml

substituting the value in the formula,

density = 48.0 / 8 = 6 cm³

Therefore, density (g/cm3) of 48.0 g of a metal if the level of water in a graduated cylinder rises from 25.0 mL to 33.0 mL after the metal is added density will be 6.0 g/cm3. option B is correct.

Learn more about density, here:

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Answer:

313.5cm²

Explanation:

Given parameters:

Weight of model  = 105pounds

Pressure applied on the scale by model = 2.16pounds per square inch

Unknown:

Area of her feet in cm² = ?

Solution:

Pressure is the force per unit area;

     Pressure  = [tex]\frac{Force}{Area}[/tex]

Input the parameters and solve;

                2.16  = [tex]\frac{105}{Area}[/tex]

       105  = 2.16 x Area

        Area = [tex]\frac{105}{2.16}[/tex]   = 48.6in²

We need now to convert the in² to cm²

          1in² = 6.45cm²

        48.6in² = 48.6 x 6.45  = 313.5cm²

Answer:

Element Helium have 2 energy levels.

Explanation:

HELIUM - With the symbol He and the atomic number 2, helium is a chemical element. It is a colorless , odorless, tasteless, non-toxic, inert, monatomic gas that is the first in the periodic table in the noble gas group. Of all the elements, its boiling point is the lowest.

At about 24 % of the total elemental mass, which is more than 12 times the mass of all the heavier elements combined, it is present. In both the Sun and Jupiter, its abundance is identical to this. This is due to helium-4's very high nuclear binding energy (per nucleon) with respect to the next three elements following helium.

Hence , the answer is 2 energy levels in Helium atom.

Answer:

"Like when people say like im a party fowl but I'm like OMg, I'm like the reason everyone loves the 4th of July like I am 4th of July.

Explanation:

As magnesium ignites easily in air and burns with a bright light, it's used in flares, fireworks and sparklers. I imagine Magnesium talks like a valley girl lol.

Answer:

sugar

Explanation:

In the absence of oxygen, the cell uses a process called anaerobic fermentation. or simply fermentation. Fermentation doesn't break the sugar down any further, it simply helps reset the system so that more sugar can be broken down.

Thus the above response is right.

Learn more about fermentation here:

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Answer:

Elements can be chemically combined into compounds, therefore, a compound consists of two or more elements combined, in definite proportions, by chemical means. Compounds may be formed by combining atoms of their constituent elements by ionic bonds or by covalent bonds.

Answer:

Chloroplast

GOOD LUCK!!!

Answer:

b

Explanation:

Answer:

No

Explanation: Neither has the dominant trait for Widow's peak, so they're both aa

Answer:

b

Explanation:

kkkk(kkkkkkkkkkkkwritten am an ah roo ero di si di dh dh ah ah eh si eri di do

Answer: the answer is B. C

Explanation:

Answer:

Explanation:

CaCO₃     +     2HCl     →      CaCl₂    +    CO₂       +       H₂O

100 gm  +  2000 mL of M HCl

Amount of HCl remaining = .1018 M of 16.62 mL

= .1018 x 16.62 mL of M HCl

= 1.69 mL of M HCl

Initial HCl taken = 50 mL of .1035 M HCl

= 5.175 mL of M HCl

HCl reacted = 5.175 - 1.69 mL of M HCl

= 3.485 mL of  M HCl

2000 mL of M HCl reacts with 100 gm of CaCO₃

3.485 mL of M HCl will react with .174 grams of CaCO₃

percentage of calcium carbonate = .174 x 100 / .2027

= 85.84 %

Answer:

23

Explanation:

Answer: A sea of electrons

Explanation:

Answer:fluorine

Explanation:

Answer:

The farthest habitable spot to the south  The whole distribution system broke down.

Explanation:

Mass of Nd₂(SO₄)₃ : 2.653 g

Reaction

Nd₂Fe₁₄B + 17H₂SO₄ → Nd₂(SO₄)₃ + 14FeSO₄ + B + 17H₂

5 g Nd₂Fe₁₄B

MW = 2. 144,242 + 14. 55.845 + 10.811

MW = 288.484 + 781.83+10.811=1081.125 g/mol

mol :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{5}{1081.125}=0.0046[/tex]

mol Nd₂Fe₁₄B = mol Nd₂(SO₄)₃=0.0046

so mass of Nd₂(SO₄)₃ :

MW Nd₂(SO₄)₃ = 2.144.242+3.32,065+12.15,999

MW = 288.484+96.195+191.988=576.667 g/mol

[tex]\tt mass=mol\times MW\\\\mass=0.0046\times 576.667\\\\mass=2.653~g[/tex]

Answer:

Particle energy

Explanation: