Waste management is important for the environment. Waste can cause pollution and disease if it is
not handled properly. There are many different methods of waste management to help ease the
environmental pressures imposed by waste. Modern methods include recycling, composting,
incineration, sustainability, landfill, integration, waste-to-energy, and waste minimization. The
planet depends on a successful approach to waste disposal.
Landfills are waste disposal sites. They are often man-made depressions in the ground covered with a
lining designed to prevent any leakage of waste materials. However, landfills can leak through the base
resulting in negative impacts on the surrounding environments. What negative impact to the
environment is caused by the production of methane gas in landfills?
A
air pollution
B)
soil fertility
groundwater pollution
D)
air pollution, groundwater pollution, soil fertility

Answer:

The correct answer is - a physical change because the material remains the same.

Explanation:

A chemical change is the change that results in the formation of the new element or the substance whereas the physical change remains the same material or substance even after the change.

The physical change can be a change in density, size, shape, or volume, and other properties. In the recycling of the aluminum can the material remain the same only shape or size of the aluminum change order to reuse.

Answer:

its D i promise

Explanation:

Answer:

the answer is the last one , sorry if im wrong.

Explanation:

a) 1 - Trigonal planar 2 - Trigonal planar

b) 1- Linear  2 - Tetrahedral  3 - Tetrahedral

c) 1 - Trigonal planar 2 - Tetrahedral

We have to know that the shapes at the various carbon atoms and other atoms would depend on the number of the electron pairs and the hybridization of the atom.

We must have to note that the shape of the atom can be found on the basis of the valence shell electron pair repulsion theory which deals with the arrangement of that electrons around the outermost shell of the central atom.

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Answer:

Volume of O₂ = 200cm³

Explanation:

Rate of diffusion of gas is directly and inversely proportional to the volume and time taken for the gas to diffuse completely.

Volume

R = -----------

time

let R₁ represent the rate at which the given volume of hydrogen gases diffuses and R₂ represent the rate at which the the volume of the oxygen gas diffused.

V₁, V₂, T₁ and T₂ follows the same process

If the two gases diffuses at the same rate, then;-

R₁ = R₂

V₁ V₂

---------- = ------------

T₁ T₂

V₂

10 = ----------------

20

V₂ = 20•10

V₂ = 200cm³

Therefore, the volume of oxygen that could diffuse in 20 seconds is 200cm³

Explanation:

In natural radioactive decay, three common emissions occur. When these emissions were originally observed, scientists were unable to identify them as some already known particles and so named them:

alpha particles ( α )

beta particles (β)

gamma rays (γ)

These particles were named using the first three letters of the Greek alphabet. Some later time, alpha particles were identified as helium-4 nuclei, beta particles were identified as electrons, and gamma rays as a form of electromagnetic radiation like x-rays, except much higher in energy and even more dangerous to living systems.

Answer:

T₂ = 128.19 K

Explanation:

Given that,

The initial volume, V₁ = 12.5 ft³

Initial temperature, T₁ = -173 °C = 100.15 K

Final volume, V₂ = 16 ft³

We need to find the new temperature. The relation between temperature and volume is given by :

[tex]V\propto T\\\\\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}[/tex]

Put all the values,

[tex]T_2=\dfrac{T_1V_2}{V_1}\\\\T_2=\dfrac{100.15\times 16}{12.5}\\\\T_2=128.19\ K[/tex]

So, the new temperature is 128.19 K.

45 g

the solubility of KCl in water at 60 degree c is 45.5g per 100g of water

Answer:31.7ml

Explanation:

A. water lily

It is a plant. Plants are autotrophs. They make their own food.

Answer:

i am not sure with the answer.

but i think it will be water lily Or insects

Cathode: 2 Ag+ (aq) + 2 e- → 2 Ag (s). Anode: 2 H+ (aq) → H2 (g) + 2 e-.

What is cathode ?

A cathode is an electrode in an electrical circuit from which electrons flow out. It is usually made of metal and is negatively charged. Cathodes are commonly used in electronic devices such as batteries, lamps, and vacuum tubes. In a battery,

the cathode is the terminal which provides a negative charge and is usually connected to the negative terminal of the battery. In a vacuum tube, the cathode is the source of electrons which flow through the tube to the anode, which is the positive terminal.

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Answer: An electron con only exist in a limited number of quantized energy levels.

Explanation:

Answer:

COVALENT

Explanation:

covalent and is formed by the sharing of two valence electrons.

Answer:

[tex][CO]=[Cl_2]=0.01436M[/tex]

[tex][COCl_2]=0.00064M[/tex]

Explanation:

Hello there!

In this case, according to the given chemical reaction at equilibrium, we can set up the equilibrium expression as follows:

[tex]K=\frac{[CO][Cl_2]}{[COCl_2]}[/tex]

Which can be written in terms of x, according to the ICE table:

[tex]0.32=\frac{x^2}{0.015M-x}[/tex]

Thus, we solve for x to obtain that it has a value of 0.01436 M and therefore, the concentrations at equilibrium turn out to be:

[tex][CO]=[Cl_2]=0.01436M[/tex]

[tex][COCl_2]=0.015M-0.01436M=0.00064M[/tex]

Regards!

Answer:

Wash hands and surfaces often. Harmful bacteria can spread throughout the kitchen and get onto cutting boards, utensils, and counter tops. To prevent this: Wash hands with soap and hot water before and after handling food, and after using the bathroom, changing diapers; or handling pets.

The definition of a transition metal is that it must have an incompleted sub-level in one or more of its oxidation states. As zinc has a completed sub-level at all oxidative states, so it can't be considered a transition metal.

Answer:

See whole explanation to understand

Explanation:

the reason why there is such a large jump from 2nd to 3rd ionization energy for calcium is because to remove the third electron, a larger amount of energy is required, since the shell is closer to the nucleus, and higher attraction exists between them. This is why the second ionization energy is 1125.4 and then the third IE is 4912.4 which is a very big difference. It's all about the elections and energy!!

Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, higher attraction between shell and nucleus, there is such a large jump from 2nd to 3rd ionization energy.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.

The reason why there is such a large jump from 2nd to 3rd ionization energy for calcium is because to remove the third electron, a larger amount of energy is needed, since the shell is closer to the nucleus, and higher attraction exists between them.

Therefore, higher attraction between shell and nucleus, there is such a large jump from 2nd to 3rd ionization energy.

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Answer:

0.0845 M

Explanation:

First we convert 4.27 grams of potassium iodide into moles, using its molar mass:

Now we calculate the molarity of the solution, using the number of moles and the given volume:

Answer:

1451.42 g

Explanation:

Let assume that the mass of ocean water comprises 3.5%

NaCl = 3.5%

[tex]3.5 = \dfrac{50.8}{mass \ of \ ocean \ water } \times 100[/tex]

[tex]mass \ of \ ocean \ water = \dfrac{50.8}{3.5 } \times 100[/tex]

mass of the ocean water = 1451.42 g

Answer:

0.369M

Explanation:

[tex]\boxed{Molarity = mole \div volume}[/tex]

☆ Volume has to be in litres

Molarity of solution

= 0.99 ÷2.5

= 0.369 M

Answer:

23.12 atm

Explanation:

First, add together the moles of the two samples:

5.25 moles + 4.20 moles = 9.45 moles

273 + 25 = 298 K for the temperature

volume is 10.0 L

Since we have moles now, we have to rearrange our ideal law equation to solve for pressure:

[tex]P = \frac{nRT}{V}[/tex]

[tex]\frac{(9.45 moles) X (0.08206) X (298 K)}{10.0 L}[/tex]

9.45 X .08206 X 298 all divided by 10.0 = 23.09202 atm (or 23.12)

The variables that might affect the investigation while dissolving different masses of salt are temperature and mass of the salt.

A variable that changed during the inquiry is regarded as an independent variable and is called "mass of salt dissolved in water." While the investigation's dependent variable, "boiling point of salt solution," is a variable that was monitored.

There are numerous things that can be changed to see how they affect other things. Variables are the changeable quantities. Any element, character trait, or condition that can exist in a variety of forms or concentrations is a variable. Independent, dependent, and controlled variables are the three types of variables that often make up an experiment.

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Neera and Tom dissolved different masses of salt in 500 cm3 of water.

They measured the temperature at which each salt solution boiled.

(a) They wrote down the variables that might affect the investigation.

(i) What is the independent variable (the variable they changed) in

their investigation?

(ii) What is the dependent variable (the variable they measured) in

their investigation?

(iii) Which variable above would affect the experiment the least?

Answer:

C. Release CO2 due to can opening

Explanation:

Le Châtelier’s principle states that when a reaction is at equillibrium and it is disturbed it will respond to return to equilibrium.

SO

H2O(l) + CO2(g) <-------------------> H2CO3(aq)

When you open a bottle of coke it is under pressure and not at equillibrium so it reacts by releasing the gas to reach equilibrium it can be seen in the equation above just that this is for club soda not coke, the idea applies though

Answer:

23 atm

Explanation:

Step 1: Given data

Step 2: Calculate the final pressure of the gas

If we assume constant temperature and ideal behavior, we can calculate the final pressure of the gas using Boyle's law.

P₁ × V₁ = P₂ × V₂

P₂ = P₁ × V₁ / V₂

P₂ = 90 atm × 2.5 L / 10 L = 23 atm

As expected, since the volume increased, the pressure decreased.

Answer:

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