Which statement best describes the effects chemicals may have on the
environment?
OA. All chemicals harm the environment.
B. Chemicals must be released in large amounts to affect the
environment.
C. Some chemicals may help the environment.
D. The effects of chemicals on the environment are easy to observe.

Cementation during the diagenesis process reduces the porosity and permeability of rocks by filling the pore spaces between grains with mineral cements, impacting fluid flow and rock strength.

Cementation is a process in which minerals precipitate and fill the spaces between sediment grains, binding them together. This process occurs as pore fluids, such as groundwater, carry dissolved minerals that can precipitate and form a solid cementing material.

During diagenesis, cementation can significantly impact the permeability and porosity of rocks. The precipitation of mineral cements fills the pore spaces between grains, reducing the overall porosity of the rock. This reduction in porosity limits the amount of fluid that can flow through the rock and decreases its permeability.

The type of mineral cement formed during cementation can also influence the strength and durability of the rock. Common mineral cements include calcite, silica, and iron oxides, which can impart different properties to the rock.

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Answer:

Explanation:

Convert mass in gms .. 987 gms

Density = mass/ volume

= 987/4.52 x102

= 2.18 g/mL

Answer:

Which half-reaction equation represents reduction?

answer is 2

Answer:

B CU2+ +2e- -> Cu

Explanation:

reduction means something opposite of the word

reduction means an electron is GAINED in the part before the arrow

it's the " + 2e- " part of the equation before the arrow or "->" part

oxidation is the LOSING of an electron so it would show up to the right of arrow or "->" of the equation as "+2e-"

both reduction & oxidation reactions are called "redox"

in a battery

anode is oxidation

cathode is reduction

anode is positive

cathode is negative electrode

decomposing compounds is electrolysis.

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The concentration of NO remaining when exactly one-half of the original amount of H₂ had been consumed is 0.0050 M.

Equation of reaction: 2 NO + 2 H₂ ---> N₂ + 2 H₂O

Experiment 2 data:

Initial concentration of NO = 0.006 M,

Initial concentration of H₂ = 0.002 M,

Initial rate = 3.6 * 10⁻⁴ L/(mol s)

From the equation of the reaction, 2 moles of NO reacts with 2 moles of H₂  to form the products.

The mole ratio of NO and H₂ is 1 : 1

One-half of the original amount of H₂ will 0.5 * 0.002 M = 0.001 M

Half of the original amount of H₂ has reacted with an equal amount of NO.

Hence, the amount of NO reacted = 0.001 M

The concentration of NO remaining = 0.0060 - 0.0010

The concentration of NO remaining = 0.0050 M

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Three factors that must be known about component substances to determine if solvation will occur are solute-solvent interactions.

Solute-Solvent Interactions: The nature and strength of interactions between the solute and solvent molecules play a crucial role in determining solvation. If the solute-solvent interactions are favorable, solvation is more likely to occur.If the solute and solvent have similar chemical properties or can form hydrogen bonds, solvation is more favorable.

Polarity of the Solute and Solvent: The polarity of the solute and solvent influences their ability to mix and dissolve. Polar solvents tend to dissolve polar solutes, while nonpolar solvents dissolve nonpolar solutes. Polar solvents have a positive and negative end, allowing them to interact with polar solutes through dipole-dipole interactions.

Solubility of the Solute in the Solvent: The solubility of a solute in a specific solvent is a critical factor in determining solvation. Solubility refers to the maximum amount of solute that can dissolve in a given amount of solvent at a particular temperature.

If the solute's solubility in the solvent is high, solvation is likely to occur. If the solute is insoluble or has low solubility in the solvent, solvation may not occur, and the solute may remain in a separate phase.

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Answer:

Explanation:

Litio -7 (⁷₃Li)

número de protones = 3

número de electrones = 3

número de neutrones = 4

Neon- 20 (²⁰₁₀Ne)

número de protones = 10

número de electrones = 10

número de neutrones = 10

Cloro - 35 (³⁵₁₇Cl)

número de protones = 17

número de electrones = 17

número de neutrones = 18

Fósforo - 31 (³¹₁₅P)

número de protones = 15

número de electrones = 15

número de neutrones = 16

Bromo - 80 (⁸⁰₃₅Br)

número de protones = 35

número de electrones = 35

número de neutrones = 45

Carbono - 14 (¹⁴₆C)

número de protones = 6

número de electrones = 6

número de neutrones = 8

Answer:

b. milk spoiling and c. firecrackers exploding

Explanation:

These are both chemical changes, the composition of them change when this happens and it cannot be reversed

Answer:

milk and starch solution are the colloids, hence these will show the tyndall effect

Answer:

milk and starch solution

Explanation:

Tyndall effect is shown by colloidal solutions. It is not shown by true solutions or suspensions.

Milk and starch solution are colloidal solutions. They show tyndall effect. On the other hand, common salt and copper sulphate solution are true solutions. They do not show tyndall effect.

Answer:

Acceleration = 3 meter per second square

Explanation:

Acceleration (A) = rate of change in velocity

so,

=》A =

\( \frac{18 - 9}{3} \)

Where time = 3 seconds

=》

\( \frac{9}{3} \)

=》

\(3\)

so, acceleration =

\(3m {s}^{ - 2} \)

1 mole of (S)-1-ethyl-6-methylcyclohexa-1,4-diene reacts with 2 moles of H2 during complete reduction using a Pt catalyst.

To determine the number of moles of H2 consumed in the complete reduction of 1 mole of (S)-1-ethyl-6-methylcyclohexa-1,4-diene using a Pt catalyst, we need to consider the stoichiometry of the reaction.

The balanced chemical equation for the reduction of (S)-1-ethyl-6-methylcyclohexa-1,4-diene with H2 is:

(S)-1-ethyl-6-methylcyclohexa-1,4-diene + H2 → (S)-1-ethyl-6-methylcyclohexane

For the complete reduction of 1 mole of (S)-1-ethyl-6-methylcyclohexa-1,4-diene with H2 using a Pt catalyst, the stoichiometry of the reaction will determine the number of moles of H2 consumed.

Since the reaction involves reduction, we can assume that each double bond in the cyclohexadiene molecule is reduced, resulting in the addition of two hydrogen atoms (H2). Therefore, for every mole of (S)-1-ethyl-6-methylcyclohexa-1,4-diene, 2 moles of H2 are consumed.

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The potential energy relative to the nucleus of an electron depend on outer electron shell.

An electron from an innermost shell needs a lot more energy to be freed than an electron from such an outermost shell. The electron in the outer shells seems to have higher potential energy than that of the innermost shells because of this.

Higher level electrons have much more energy when you move out from the nucleus, and so this energy gain is stable and discontinuous. If they take in this much energy, electrons could leap from one lower energy level to the subsequent higher level.

Therefore,  the potential energy relative to the nucleus of an electron depend on outer electron shell.

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Answer:

Silver ions.

Explanation:

The most extensively studied nanomaterials for water purification and treatment mainly includes zero-valent metal nanoparticles, metal oxides nanoparticles, carbon nanotubules and nanocomposites.

Answer:

B . CO2(g) -----> CO2(l) Entropy canbe decreased only in the cases when liquid is converted to solid and when gas is converted to solid or liquid. The option B is correct.

Answer:

b. CO_2 (g) --> CO_2 (l)

Explanation:

A P E X

Answer:

I hope it's helpful............

Answer:

Explanation:

Air is a mixture of roughly 80% nitrogen and 20% oxygen. The diatomic molecules of each type have a Maxwell-Boltzman distribution of velocities.

From the kinetic theory of gases the molecules kinetic energy will depend on the temperature.

Let’s use 300 K as room temperature : The nitrogen molecules have a root mean square velocity ( VRMS ) of 353 m/s. The average for all of the molecules is 347 m/s.

In general in gases of diatomic molecules the speed of sound is 68% of the molecular  VRMS .

Answer:

the periodic table is G.

The periodic table has the elements placed in the locations that match the information on the flash cards is F.

The term "periodic table" refers to an arrangement of all known elements in order of increasing atomic number and recurrent chemical attributes. The periodic table is organized into 118 elements.

The term "periodic table" can also refer to a table that lists all known chemical elements in rows and columns.

In the F table, L is found in alkaline earth metals while M is found in transition metals. M has more valence electrons than L, while L is more reactive than M.

Thus, the  periodic table has the elements placed in the locations that match the information on the flash cards is F.

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The list that gives the correct symbols for the elements phosphorus, potassium, silver, chlorine, and sulfur in that order is P, K, Ag, Cl, S (option D).

Chemical symbol is the 1- to 3-letter international code for a chemical element.

Element symbols for chemical elements normally consist of one or two letters from the Latin alphabet and are written with the first letter capitalised.

According to this question, five elements are given. The chemical symbols of each element is as follows;

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Answer: m Most likely Group2 metals and Group 17 non-ktta                                                                

Explanation:

A little more information is needed to be certain, but the likely answer is that X belongs to Group 2 and Y belongs to Group 17.  Group 2 metals (Be, Mg, Ca, Sr, Ba, etc.) are all divalent.  They gave rive up 2 electrons each to return to a full shell.  Group 17 elements (e,g, F, Cl, Br, I, etc.) all require 1 electron to reach a full valence shell.  That would make the proportion 1X to 2Y, or XY2.  It is possible that a metal outside of Group 2 would also have a valency of 2.  Iron(II) forms FeCl2, for example.

Answer:

See explanation

Explanation:

We first obtain the mole fraction of propane at the start and end;

0.01 = x/0.62 + 0.28 + x

0.01[0.62 + 0.28 + x] = x

0.01[0.9 + x] =x

9 * 10^-3 + 0.0.1x = x

9 * 10^-3 = x - 0.0.1x

9 * 10^-3 = 0.99x

x = 9 * 10^-3/0.99

x = 9.09 * 10^-3

After

For methane

0.62/ 0.28 + 0.62 + 9.09 * 10^-3     = 0.68

For ethane

0.28/0.28 + 0.62 + 9.09 * 10^-3       =0.31

Change in partial pressure of methane = (0.68 - 0.62) * 100kPa = 6 kPa

Change in partial pressure of ethane = (0.31 - 0.28) * 100kPa = 3 kPa

Change in partial pressure of propane= (0.01 - 0.1) * 100kPa = -9 kPa

Tectonic forces do not cause plates to slide over and under each other, to produce heat and pressure which forms igneous rocks

The rock cycle is a cycle which describes how the three basic rock types are related and how earth processes convert one rock type into another over geologic time.

Plate tectonic forces together with weathering and erosional processes, are responsible for the rock cycle.

Tectonic forces play the following roles in rock cycle:

Therefore, the statement that when plates slide over and under each other, the heat and pressure form igneous rocks is not True.

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The rate of a chemical reaction is typically expressed in terms of units of concentration per unit of time. The most common unit used is moles per liter per second (mol/L/s), which represents the change in concentration of a reactant or product over time.

For example, if a reaction involves the conversion of reactant A to product B, the rate of the reaction can be expressed as the change in concentration of A per unit time, divided by the volume of the reaction mixture. This can be written as Δ[A]/Δt or d[A]/dt.

Other units that may be used to express the rate of a reaction include Molarity per second (M/s) or grams per liter per second (g/L/s), depending on the specific context and the units in which the concentrations are measured.

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Answer:

3.

a.climate

4.

c.average measurements of temperature and rainfall over many years

It can take hundreds of years for a plastic bag to decompose.

Plastic bags are made from synthetic polymers, which are materials that do not biodegrade easily. In the environment, plastic bags can break down into smaller and smaller pieces, but they never completely disappear. In ideal conditions, a plastic bag can take anywhere from 10 to 1000 years to decompose, but the exact amount of time depends on a number of factors such as the type of plastic, exposure to sunlight and heat, and presence of other decomposers like bacteria and fungi.

Because plastic bags do not decompose quickly, they can persist in the environment for a long time and cause problems for wildlife, ecosystems, and human health. For this reason, many communities have implemented plastic bag reduction and recycling programs to help reduce their impact on the environment.

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Answer:

Sugar, sodium chloride, and hydrophilic proteins are all substances that dissolve in water. Oils, fats, and certain organic solvents do not dissolve in water because they are hydrophobic.

And, water is called the "universal solvent" because it dissolves more substances than any other liquid. ... Water molecules have a polar arrangement of the oxygen and hydrogen atoms—one side (hydrogen) has a positive electrical charge and the other side (oxygen) had a negative charge.

I don't see any options so there i hope it helps .

Answer:

b is correct method.

Explanation:

Given that,

Volume of tank = 64 liter

We need to find the conversion liter to quarts

Using conversion

\(1\ L=\dfrac{1\ l}{1.057\ quarts}\)

We need to find the conversion quarts to gallons

Using conversion

\(1\ quarts=\dfrac{1\ l}{4\ gallons}\)

We need to find correct method

Using conversion

\(64\ L=\dfrac{1\ L}{1.057}\times\dfrac{1\ gallon}{4\ quarts}\)

Hence, b is correct method.

The original amount of strontium 90 present in the rock sample was 24.0 grams.

Strontium 90 is a radioactive isotope of strontium with a half-life of 28.8 years. As such, the amount of strontium 90 present in a sample decreases by half every 28.8 years.

In this question, it is stated that 3.0 grams of strontium 90 remained in the rock sample in 1989. Therefore, we can use this information to calculate how much strontium 90 was originally present in the rock sample.

Let X be the original amount of strontium 90 present in the rock sample.

After 28.8 years, the amount of strontium 90 remaining in the sample would be X/2.

After another 28.8 years (a total of 57.6 years since the original sample was taken), the amount of strontium 90 remaining in the sample would be (X/2)/2 = X/4.

And after another 28.8 years (a total of 86.4 years since the original sample was taken), the amount of strontium 90 remaining in the sample would be (X/4)/2 = X/8.

We can use this information to set up the following equation :  X/8 = 3.0

Dividing both sides by 1/8 gives : X = 3.0 x 8 = 24.0

Therefore, the original amount of strontium 90 present in the rock sample was 24.0 grams.

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Answer:

c

Explanation:

The coefficient of Al in the balanced chemical equation has been 2. Thus, option B is correct.

The balanced chemical equation has been termed as the equation where the atoms of each element have been the same on the product and the reactant side.

The given chemical equation has consisted of 2 atoms of Br on the reactant side and 3 atoms of Br on the product side.

The atoms have been balanced with the addition of coefficient 3 on the reactant side, and 2 on the product side. This will give the 6 atoms of Br on both the products and the reactant's side.

\(\rm Al\;+\;3\;Br_2\;\rightarrow\;2\;AlBr_3\)

The atoms of Al have become imbalanced. The Al atoms can be balanced by the addition of 2 as a coefficient on the reactant side. This will provide 2 atoms of Al on both the product and the reactant side.

\(\rm 2\;Al\;+\;3\;Br_2\;\rightarrow\;2\;AlBr_3\)

The coefficient of Al in the balanced chemical equation has been 2. Thus, option B is correct.

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Answer:

The pH of the solution formed is approximately 12.614.

Explanation:

First, we need to calculate the molarity of the Ba(OH)₂ solution:

moles of Ba(OH)₂ = mass / molar mass = 3.470 g / (137.327 g/mol + 2*15.9994 g/mol) = 0.01156 mol

molarity = moles / volume = 0.01156 mol / 0.5631 L = 0.02055 M

Ba(OH)₂ is a strong base, and it will dissociate completely in water to give two OH⁻ ions for every Ba(OH)₂ molecule:

Ba(OH)₂ → Ba²⁺ + 2OH⁻

So the concentration of OH⁻ ions in the solution is 2 * 0.02055 M = 0.0411 M.

Now we can use the equation for the ion product constant of water to calculate the pH of the solution:

Kw = [H⁺][OH⁻] = 1.0 x 10⁻¹⁴

pH + pOH = 14.00

pOH = -log[OH⁻] = -log(0.0411) = 1.386

pH = 14.00 - pOH = 14.00 - 1.386 = 12.614

Therefore, the pH of the solution formed is approximately 12.614.