which of the following is not true about mountain top removal for mining coal.
Answers
Answer:
Mountaintop removal is a radical form of coal mining in which the tops of mountains are literally blasted off to access seams of coal. It takes place in the Appalachian Mountains, one of the oldest mountain ranges on Earth.
Related Questions
Which of the following examples includes both a point and a nonpoint source of pollution?
answer choices
Waste from animal feedlots and sediment from construction sites
A factory smokestack and a sewage overflow
Runoff from city streets and pesticides from agricultural fields
Fertilizer from suburban lawns and wastewater from a water treatment plant
Answers
Fertilizer from suburban lawns and wastewater from a water treatment plant.
What is fertilizer?
Compost, animal manure, human excrement, harvested minerals, crop rotations, and byproducts of human-nature businesses were historically used as fertilisers. But following advancements in plant nutrition, beginning in the 19th century, an agricultural sector centred on synthetic fertilisers emerged. The global food system was significantly altered by this shift, which made way for industrial agriculture on a greater scale and with higher crop yields.An increase in the use of nitrogen fertilisers was brought on by chemical techniques that fixed nitrogen, such as the Haber process at the beginning of the 20th century.To know more about fertilizer, click the link given below:
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Answer:
Of the options below, which is an example of a point source of water pollution?
Litter and pet waste are left on a city’s beaches.
Landscapers' fertilizers and pesticides are sprayed on the lawns of a neighborhood.
Acidic runoff from abandoned mines contains lead and mercury that saturate the soil.
A factory’s wastewater pipe opens directly over a nearby river.
CONCEPT
Explanation:
Correct Answer:
A factory’s wastewater pipe opens directly over a nearby river.
where does desalinated water originally come from?
Answers
How would I balance this?
Answers
The balance chemical reaction is as below:
4Fe (s) + 3O₂ (g) ⇒ 2Fe₂O₃ (s)
What is balance chemical reaction ?The term balanced chemical equation is defined when the number of the atoms involved in the reactants side is exactly equal to the number of atoms in the products side.
The most important thing about balancing chemical equations is to satisfy the law of conservation of mass, This states that “the total mass of the products is exactly equal to the total mass of all the reactants”
Thus, The balance chemical reaction is as below:
4Fe (s) + 3O₂ (g) ⇒ 2Fe₂O₃ (s)
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Identify the final concentrations of each species following the addition of 1.0 M KOH to a 2.0 M HF solution.
HF (aq) + KOH (aq) ⟶ KF (aq) + H 2 O (l) initial a. 2.0 M b. 1.0 M c. 0 M
Answers
The final concentrations of each species are: HF: 1.0 M, KOH: 0 M, KF: 1.0 M, H2O: 1.0 M. To determine the final concentrations of each species, we need to use stoichiometry and the concept of limiting reactants.
The balanced chemical equation for the reaction is:
HF (aq) + KOH (aq) → KF (aq) + H2O (l)
From the equation, we can see that the reaction produces one mole of KF for every mole of HF reacted with KOH.
Initially, we have 2.0 moles of HF and 1.0 moles of KOH. Since the stoichiometry of the reaction is 1:1, KOH is the limiting reactant because it is present in a lower amount.
So, all of the 1.0 moles of KOH will react completely with 1.0 moles of HF, leaving 1.0 mole of HF unreacted.
The amount of KF produced will be equal to the amount of HF that reacted, which is 1.0 mole.
The amount of water produced is also 1.0 mole, since the stoichiometry of the reaction is 1:1.
Therefore, the final concentrations of each species are:
HF: 1.0 M (since 1.0 mole of HF remains in solution)
KOH: 0 M (since all 1.0 mole of KOH reacted)
KF: 1.0 M (since 1.0 mole of KF was produced)
H2O: 1.0 M (since 1.0 mole of water was produced)
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what causes the litmus to change from purple to pink?
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Litmus is a type of dye that is extracted from lichens and is commonly used as a pH indicator. The color change from purple to pink indicates a change in the acidity or basicity of a solution.
In an acidic solution, the hydrogen ion (H+) concentration is high, which causes the litmus dye to change from its original blue color to red. In a neutral or basic solution, the hydrogen ion concentration is low, and the litmus dye remains blue. However, if the solution is sufficiently basic, the litmus dye will change from blue to pink. The exact mechanism of this color change is due to the chemical structure of the litmus dye, which contains a variety of functional groups that can interact with hydroxide ions (OH-) in a basic solution. This interaction causes a change in the electronic structure of the dye molecules, which results in a change in their absorption and transmission of light and, therefore, a change in color.
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Which sentence describes all atoms of one element?
1.) they have the same number of isotopes?
2.) they have the same number of neutrons?
3.) they have the same number of electrons?
4.) they have the same number of protons?
Answers
Answer:
4. they have the same number of protons
Explanation:
while all the other particles and attributes can be changed, protons cannot.
please someone should explain gas laws to me
Answers
Answer:
Gas laws, Laws that relate the pressure, volume, and temperature of a gas. ... These two laws can be combined to form a single generalization of the behavior of gases known as an equation of state, PV = nRT, where n is the number of gram-moles of a gas and R is called the universal gas constant.
Explanation:
Hope it helps
6.How many moles of gas would be in contained in a 11.2 L container that is at a
pressure of 0.75 atm and 300 K?
A.0.17
B.034
C.1.37
D.7.31
Answers
0.34 moles of gas would be contained in a 11.2 L container that is at a pressure of 0.75 atm and 300 K.
HOW TO CALCULATE NUMBER OF MOLES?The number of moles of a substance can be calculated using the following expression:
PV = nRT
Where;
p = pressure (atm)v = volume (L)n = number of molesR = gas law constantT = temperature0.75 × 11.2 = n × 0.0821 × 300
8.4 = 24.63n
n = 8.4 ÷ 24.63
n = 0.34 moles
Therefore, 0.34 moles of gas would be contained in a 11.2 L container that is at a pressure of 0.75 atm and 300 K.
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As part of an investigation, students combined substances in a beaker to observe
chemical reactions. They performed two procedures. They measured the mass of
each substance before and after each reaction. The table shows their observations.
Mass of Products
Procedure
97.59
Procedure 2
102.50
Procedure 1: All the reactants were liquids that evaporated.
Procedure 2: A gas was formed as one product, and it escaped into
the air
Mass of Reactants
100.0 9
100.00
Procedure 1: One of the reactants was converted to thermal
energy,
Procedure 2: All the products were liquids.
e
Assuming the students did not make any careless errors, what likely explains these
changes in mass?
Procedure 1: The reactants were liquids with different densities.
Procedure 2: The reactants were combined into only one product.
e
air.
Procedure 1: One of the products was a gas that escaped into the
Procedure 2: A gas from the air reacted with one of the other
reactants and formed a precipitate.
CLEAR ALL
Answers
Answer:
please mark brainlest and it's Procedure 1: One of the products was a gas that escaped into the air.
Procedure 2: A gas from the air reacted with one of the other reactants
Explanation:
the gas ca evaporate so it would'nt be a or c and b dosent make sense.
When measuring the temperature drop across the evaporator in a central air conditioning system, a properly running unit on a humid summer day should read between?
Answers
On a humid summer day, a properly operating central air conditioning system should register between 15-250 F.
By using a dry-bulb thermometer, all these temperatures within and outside the coil of the evaporator should be monitored. The construction of many walk-in refrigerators is centred upon an evaporator TD of around 10 °F. The case's rh will be kept at around 85% due to the temperature differential, which would prevent the air from losing much of its humidity. This is perfect for storing food items for a long time. The more moisture is extracted from the atmosphere and the lesser the case's sustained rh, the higher the temperature differential and vice versa.
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Too lazy to show the question/answers.. look I comments :) (picture above for change dude)
Answers
Answer:
B. an object is cut into pieces
Explanation:
hope this helps
The graph below represents the uniform heating of a solid starting below its melting point. Which portion of the graph represents the heat of fusion of a substance?
Answers
The heat of fusion of the substance can be shown from option B.
What is the heat of fusion?The amount of heat energy required to transform a substance from a solid phase to a liquid phase at its melting point is known as the heat of fusion, also known as the enthalpy of fusion. The solid-liquid transition is the subject of a particular category of phase transition enthalpy.
The strong intermolecular interactions that keep a substance's particles organized into a solid lattice are dissipated during fusion, allowing the particles to change into a more disordered, fluid state.
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find the concentration in (a) mg/l, (b) ppm, (c) ppb, and (d) moles/l (m), respectively, for the following solution: 0.5 g of kcl dissolved in 500 ml of water
Answers
The formula for calculating the concentration of a solution in mg/L is as follows:Concentration in mg/L = (weight of solute in mg / volume of solution in L). Concentration in mg/L = (0.5 g × 1000 mg/g) / 0.5 L. Concentration in mg/L = 1000 mg/L.
(b) The formula for calculating the concentration of a solution in ppm is as follows:
Concentration in ppm = (weight of solute in mg / volume of solution in ml) × 10³.
Concentration in ppm = (0.5 g × 1000 mg/g) / 500 ml × 10³.
Concentration in ppm = 1000 ppm.
(c)The formula for calculating the concentration of a solution in ppb is as follows:
Concentration in ppb = (weight of solute in mg / volume of solution in ml) × 10⁶.
Concentration in ppb = (0.5 g × 1000 mg/g) / 500 ml × 10⁶.
Concentration in ppb = 1000000 ppb.
(d) Moles/lThe molecular weight of KCl is 74.55 g/mol.
To calculate the concentration of KCl in moles/liter, we must first convert 0.5 g to moles.
Number of moles = weight / molecular weight.
Number of moles of KCl = 0.5 g / 74.55 g/mol.
Number of moles of KCl = 0.0067 moles.
Concentration in moles/liter = number of moles / volume in L.
Concentration in moles/liter = 0.0067 moles / 0.5 L.
Concentration in moles/liter = 0.013 M (M = moles/L).
Therefore, the concentration of KCl is (a) 1000 mg/L, (b) 1000 ppm, (c) 1000000 ppb, and (d) 0.013 M.
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the basic fact that determines molecular shapes is that
Answers
Answer:
The shape of a molecule is mostly determined by repulsion among the pairs of electrons around a central atom.
problem 4.2 draw the chemical structural formula of 2-methyl-2, 3-ethylbutane. this is an isomer of what chemical family? write the balanced chemical reaction equation for one mole of this fuel burning with an equivalence ratio of φ
Answers
2-Methyl-2,3-ethylbutane is an isomer of the alkane chemical family.
Is this compound a member of the alkane family?2-Methyl-2,3-ethylbutane belongs to the alkane chemical family, which consists of hydrocarbons with only single bonds between carbon atoms. The chemical structural formula of 2-methyl-2,3-ethyl butane is as follows:
CH3 CH3
| |
CH3-C-CH2-CH2-CH3
In this molecule, there are five carbon atoms arranged in a linear chain, with two methyl (CH3) groups attached to the second carbon atom. Additionally, there is an ethyl (CH2CH3) group attached to the third carbon atom. The presence of only single bonds between carbon atoms and the absence of any functional groups classify it as an alkane.
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What mass of H2 forms when
35.25 g of Al reacts with excess
hydrochloric acid?
2AI+ 6HCI→ 2AlCl3 + 3H₂
Al: 26.98 g/mol
H₂: 2.02 g/mol
[?] g H₂
Answers
35.25/26.98 (mass reacted/molar mass of Al)
2) Find number of moles of H2 produced:
Number of mol. of Al x 3/2 (based on stoichiometry)
3) Find mass of H2 formed:
Number of mol. of H2 x molar mass of H2 = 3.9588mol = 4 mol (estimated value)
why is the equilbrium constant of the dissociation of kht equal to the square of the bitartrate concentation
Answers
The equilibrium constant of the dissociation of potassium hydrogen tartrate (KHT) is equal to the square of the bitartrate concentration due to the dissociation of KHT into two hydrogen ions (H+) and bitartrate ions (HC₄H₄O₆⁻) as shown below:
KHT ⇌ H+ + HC₄H₄O₆⁻
Here, the equilibrium constant expression for the dissociation reaction of KHT can be written as follows:
Kc = [H+] [HC₄H₄O₆⁻]/ [KHT]
As we know, KHT dissociates into two moles of bitartrate ion (HC₄H₄O₆⁻) and one mole of hydrogen ion (H+). So, after the dissociation of KHT, the concentration of the bitartrate ion (HC₄H₄O₆⁻) will be double that of the hydrogen ion (H+).
Therefore, the concentration of hydrogen ion (H+) will be equal to the square root of the concentration of bitartrate ion (HC₄H₄O₆⁻).
Hence, Kc = [H+]²[HC₄H₄O₆⁻]/ [KHT] = [HC₄H₄O₆⁻]²/ [KHT]
This is the reason why the equilibrium constant of the dissociation of KHT is equal to the square of the bitartrate concentration.
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Which of these describes a way in which humans could increase biodiversity in a marine ecosystem?
A. Fish populations increase as dissolved oxygen decreases.
B. Data that shows how trees get affected by disease as levels of acid rain increases.
C. Data showing how forests grow when acidic precipitation decreases.
Answers
The statement that describes a way in which humans could increase biodiversity in a marine ecosystem is as follows: Fish populations increase as dissolved oxygen decreases (option A).
What is biodiversity?Biodiversity is the diversity (number and variety of species) of plant and animal life within a region.
It can be used more specifically to refer to all of the species in one region or ecosystem. Biodiversity refers to every living thing, including plants, bacteria, animals, and humans.
Marine ecosystem are aquatic environments with high levels of dissolved salt. These include the open ocean, the deep-sea ocean, and coastal marine ecosystems, each of which has different physical and biological characteristics.
The biodiversity of a marine ecosystem can be illustrated by the increase in fish populations in the marine environment, hence, option A is correct.
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In the Millikan oil droplet experiment, the oil is sprayed from an atomizer into a chamber. The droplets are allowed to pass through the hole into the chamber so that their fall can be observed. The top and bottom of the chamber consist of electrically charged plates. The upper plate is positively charged, and the lower plate is negatively charged. X rays are introduced into the chamber so that when they strike the oil droplets, the droplets will acquire one or more negative charges. The electric field (voltage) is applied to the metal plates.
Watch the animation and identify the effects of an electric field on the motion of a negatively charged oil droplet. Consider the gravitational force as Fg and the electric force as Fe. All the other forces acting on the oil droplet can be ignored as their effect on the motion of the oil droplet is negligible.
A/ In the absence of an electric field, the oil droplet falls freely due to the gravitational force.
B/ If Fe is increased until it is equal to Fg, the negatively charged oil droplet will remain stationary.
C/ If Fe is greater than Fg, the negatively charged oil droplet will move freely toward the negatively charged plate.
D/ In the presence of an electric field, the negatively charged oil droplet moves freely toward the negatively charged plate.
** I chose B, but that was the wrong answer
Answers
C/ If Fe is greater than Fg, the negatively charged oil droplet will move freely toward the negatively charged plate.
In the Millikan oil droplet experiment, the negatively charged oil droplets are subjected to an electric field created by the charged plates. The electric force (Fe) acts on the oil droplet in a direction opposite to the gravitational force (Fg). When Fe is greater than Fg, the electric force overcomes the gravitational force, causing the negatively charged oil droplet to experience an upward force. As a result, the oil droplet moves freely upward toward the negatively charged plate.
Option B is incorrect because if Fe is equal to Fg, the forces balance each other, resulting in a stationary droplet. However, the question states that Fe is increased until it is greater than Fg, implying that the droplet is no longer stationary but moves in response to the electric force.
Therefore, option C is the correct answer, as it describes the effect of an electric field on the motion of a negatively charged oil droplet in the Millikan oil droplet experiment.
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When you lie down on a mattress the force of ______ pulls your mass towards the floor, while the force of the mattress pushes back up resulting in _______ forces, which allow you to sleep comfortably.
Answers
Answer:
1 gravity 2 counteractive
Explanation:
Enter the chemical formula for the cation present in the aqueous solution of Zn(C2H3O2)2
Answers
The chemical formula for the cation present in the aqueous solution of Zn(C₂H₃O₂)₂ is Zn²⁺.
In this compound, Zn represents the symbol for zinc, and the subscript 2 indicates that there are two zinc ions present. The acetate ion, acts as the anion in the compound and balances the charge of the cation.
When dissolved in water, Zn(C₂H₃O₂)₂ dissociates into Zn²⁺ cations and C₂H₃O₂⁻ anions. Zinc cations are positively charged due to the loss of two electrons, resulting in a 2+ charge.
These cations are attracted to the negatively charged oxygen atoms in the acetate ions, forming the aqueous solution of Zn(C₂H₃O₂)₂+.
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A 0.18-m rigid tank is filled with saturated liquid water at 120°C. A valve at the bottom of the tank is now opened, and one-half of the total mass is withdrawn from the tank in the liquid form. Heat is transferred to water from a source at 230°C so that the temperature in the tank remains constant.
Answers
During the process of withdrawing one-half of the total mass of saturated liquid water from the 0.18-m rigid tank at 120°C, heat is transferred from a 230°C source to maintain a constant temperature in the tank. This results in the remaining water in the tank staying in the saturated liquid state at 120°C.
Regarding the 0.18-m rigid tank filled with saturated liquid water at 120°C, where one-half of the total mass is withdrawn in liquid form and heat is transferred from a 230°C source to maintain a constant temperature, please consider the following steps:
1. The initial state of the system is a saturated liquid water at 120°C.
2. The valve at the bottom of the tank is opened, allowing one-half of the total mass to be withdrawn in the liquid form. This reduces the mass of water in the tank by 50%.
3. During this process, heat is transferred to the water from a 230°C source to maintain the constant temperature of 120°C in the tank. This heat transfer compensates for the cooling effect caused by the withdrawal of liquid water.
4. Since the temperature in the tank remains constant at 120°C, the water remains in the saturated liquid state throughout the process.
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What is the pH of a solution of KOH with a hydroxide concentration of [OH⁻] = 1.10 x 10⁻⁴
Answers
Answer:
\(p[H+] = 10.042\)
Explanation:
As we know that
\(pKw = pH + pOH\)......eq (1)
we will calculate the pH of OH- and then we will calculate the pH of H+
So p[OH-] \(= - log [1.10 * 10^{-4}]\)
Solving the right side of the equation, we get
p[OH-]
\(= - [-3.958]\\= 3.958\)
Now we know that
\(pKw = 14.0\)
Substituting the value of pOH in the above equation, we get -
\(14.0 = p[H+] + 3.958\\p[H+] = 14 - 3.958\\p[H+] = 10.042\)
Bubbling during a chemical reaction is an indicator that a ______
I has been produce
Answers
Answer: gas
Explanation:
A barometer measures the pressure of the atmosphere at different altitudes. Identify the location where the column of mercury is lowest in the barometer.
Answers
Answer:
the mercury would be lowest at location 4.
Explanation: this is because pressure and altitudes have inverse relationship at the troposphere. higher altitude has lower pressure. also pressure at location 4 contribute to pressure at location 1. but pressure at location 1 do not contribute to pressure at location 4.
True or false chemistry. No links.
Answers
how much volume does a 3.2 M solution of NaCl occupy with 50 moles of NaCl in solution?
Answers
Answer:
data given
molarity 3.2m
moles 50mol
Required volume
Explanation:
from
molarity =mole/volume
3.2=50/v
v=15.62
:.volume is15.62dm^3
Calculate the mass of 140g of Cl2
Answers
Answer:
6amu
Explanation:
mass=proton+neutron
mass of cl2=2(16+16)=64amu
In the quantum-mechanical hydrogen atom model, the angular momentum of the electron in the atom is determined by the integer ______.
Answers
Answer:
0 to n − 1
Explanation:
The angular or orbital quantum number, gives a description of the particular subshell or orbital where the electron is found and gives the magnitude of its orbital angular momentum.
The values of the angular momentum quantum number (ℓ) takes on integer values that ranges from 0 to n − 1
what will be the result of the reaction
(CH3COO)2+redP +Cl2
Answers
Answer:
(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl
Explanation:
This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.