Calculate the number of atoms in a 1.05 x 10^3 mole sample of argon.

³⁸₁₈Ar nucleus completes the given equation, hence option D is correct.

The equation provided illustrates how an unstable chlorine isotope breaks down into a beta particle and an argon nucleus. To create an Argon nucleus that is more stable, the nucleus emits a beta particle.

Stable isotopes and supposedly unstable or radioactive isotopes are the two categories into which isotopes fall in science. These last ones are stable and don't produce radioactive radiation.

While Xenon and other isotopes are known to be stable, Xenon-124 and Xenon-136 deteriorate over the course of several trillion years.

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Sulfuric acid speleogenesis occurs where limestone overlies strata rich in hydrocarbons, the correct option is D.

Sulfuric acid speleogenesis is the process of cave formation that occurs due to the dissolution of limestone by sulfuric acid. In this process, hydrocarbons are oxidized to produce sulfuric acid, which reacts with the limestone to dissolve it, leading to the formation of caves. This process is responsible for the formation of some of the largest caves in the world, such as Carlsbad Caverns in New Mexico and Mammoth Cave in Kentucky.

Sulfuric acid speleogenesis typically occurs in areas where hydrocarbons are present in the underlying rock layers, such as in oil-rich regions. It can also occur in areas where coal or other carbon-rich materials are present, the correct option is D.

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The complete question is:

Sulfuric acid speleogenesis:

Choose one:

A. occurs when microbes convert hydrogen sulfide gas into gypsum.

B. happens most often above the water table.

C. is responsible for the vast majority (greater than 80%) of all caves.

D. occurs where limestone overlies strata rich in hydrocarbons.

If the bird population is directly proportional to the average monthly temperature, 12 December would have the lowest temperature.

A population is a subgroup of individuals belonging to a single species that coexists sexually and occupies a specific geographic area. For certain species, it is simple to determine the geographic limits of a population; for other species, it might be more challenging.

Making decisions can be aided by knowledge of how population parameters, such as size, regional distribution, age structure, or birth and death rates, vary over time.

When an animal population exceeds the carrying capacity of its ecosystem, hazardous impacts can result, including hunger and disease. Due to overpopulation, as predators were rare, many animal species started to disappear or died.

As a result, if the relationship between the bird population and average monthly temperature is direct, 12 December would have the lowest temperature.

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Answer:

Sandstone, limestone, and shale

Explanation:

The rocks are most likely to start as sediments carried in rivers and end up in lakes and oceans

Answer:

D - materials dissolved in solutions

Explanation:

EDGE 2021

Answer:

The number of outer shell electrons determines the group number of the element. The number of occupied principle quantum shells (energy levels) determines the period of the element. The proton number determines the element itself and its position.

Explanation:

The equilibria studied in the lab procedure include sodium chloride and potassium iodide.

Sodium chloride (NaCl) and potassium iodide (KI) are both ionic compounds that are soluble in water. When they are dissolved in water, they dissociate into their constituent ions.

NaCl dissociates into sodium ions (Na+) and chloride ions (Cl-), while KI dissociates into potassium ions (K+) and iodide ions (I-)

When solutions of NaCl and KI are mixed together, the following reaction takes place:

NaCl + KI → NaI + KCl

The products of this reaction are sodium iodide (NaI) and potassium chloride (KCl).

This reaction is a double displacement reaction, also known as a metathesis reaction, where the cations and anions of two different ionic compounds exchange places to form two new ionic compounds.

The reaction can also be represented using ionic equations:

Na+ (aq) + Cl- (aq) + K+ (aq) + I- (aq) → Na+ (aq) + I- (aq) + K+ (aq) + Cl- (aq)

Overall, the reaction is a neutralization reaction because Na+ and K+ cations from NaCl and KI, respectively, switch partners with the I- and Cl- anions from KI and NaCl, respectively.

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Answer:

HBr

Explanation:

Reaction happens in both directions. Concentrations of both reactants and products remain constant.

Explanation:

All reactions are reversible, and as more products are produced, the reverse reaction might start to occur more often. Both are effectively occurring at the same time in any given chemical reaction once any product has been produced.

Dynamic equilibrium is defined as the moment in time when the rate of the forward reaction is equal to the rate of the reverse reaction.

This means that the reactions are happening in both directions, and the concentrations of both reactants and products remain constant.

When a reaction reaches dynamic equilibrium in a closed system, the reaction continues to happen in both directions at the same rate, thereby ensuring the concentrations of reactants and products remain constant. They neither increase nor decrease.

When a reaction reaches dynamic equilibrium in a closed system, it doesn't mean the reaction stops. In fact, the reaction continues to occur in both directions at the same rate. This is known as forward and reverse reactions happening simultaneously, and it essentially ensures the concentrations of the reactants and products remain constant. They neither increase nor decrease due to the balance maintained by these simultaneous reactions.

An analogy to visualize dynamic equilibrium could be a bathtub with the drain open while the faucet is running. Water is entering (like the forward reaction) and leaving the tub (reverse reaction) at the same rate, thus, the water level (reaction concentrations) remains constant.

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Answer: antimony

Explanation:

Answer:

69%

Explanation:

Percent yield = ?

Theoretical yield = 985 grams

Experimental Yield = 680 grams

Percent Yield = Experimental Yield / Theoretical Yield * 100

Percent Yield = 680 / 985  * 1 00

Percent Yield = 0.690 * 100 = 69%

The colour of Variamine blue salt B, a redox indicator changes from yellow to colourless at the endpoint of the complexometric titration indicating alkalinity.

Complexometric titration (also known as chelatometry) is a type of volumetric analysis in which the creation of a coloured complex is utilized to determine the titration's end point. Complexometric titrations are extremely useful for estimating the concentration of a metal ion mixture in solution. EDTA, or ethylenediaminetetraacetic acid, is a frequent indicator for complexometric titration because it may function as a ligand, binding to coordination centers, which are generally metals, to produce colourful complexes. Organic dyes are the most commonly used indicators in complexometric titrations because they generate a colourful complex with the metal ion being titrated. EDTA replaces the indicator during the reaction to create a more stable complex with metal, and when the reaction is through, the colour changes.

The alkalinity of solution is indicated by a colour change from yellow to colourless in the complexometric titration using Variamine blue salt B as the indicator.

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The value of  \(K_{sp}\)  for PbS is \(9.0\times10^{-29}\).

Molar solubility (M) is a unit of measurement for a compound's capacity to dissolve in a particular liquid, also known as a solvent. Molar solubility is measured in terms of \(\frac{moles}{litre}\) since it is the most moles of a solute that can dissolve in one liter of solvent. The solution is said to be saturated when it can no longer dissolve any more solute and the number of moles dissolved in a liter of solvent equals the molar solubility.

Lead(II) sulfide is a poorly soluble salt compound in water with the following Solubility Equilibrium:

\(PbS(s)\Longleftrightarrow Pb^{+2}(aq)+S^{-2} (aq)\)

\(K_{sp}=[Pb^{+2}][S^{-2} ]\)

The compound dissociates in a 1:1 ratio of ions, therefore the molar Solubility is 's' in water will be :

s=\(9.5\times10^{-15}\).

\(K_{sp}=s\times s=s^{2}\)

\(K_{sp}=(9.5\times10^{-15} )^{2}\)

\(K_{sp} =9.0\times10^{-29}\)

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Answer:

It may leave some chemicals such as herbicides and pesticides in the water

Explanation:

i just took the test

Distillation may leave some chemicals such as herbicides and pesticides in the water. Therefore, option D is correct.

By using selective boiling and condensation, distillation, also known as traditional distillation, is the process of removing the constituents or compounds from a liquid mixture. The process of heating solid materials to create gaseous products is known as dry distillation.

A chemical is purified through distillation by being separated from a non-volatile or less-volatile substance. Because various compounds frequently have different boiling points, when a mixture is distilled, the components frequently separate from the mixture.

Among the many industrial uses of distillation are the production of alcoholic drinks, water purification, and oil refining. Distillation is a physical procedure that removes desired pure compounds from an initial source using heat and other techniques.

Thus, option D is correct.

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The cultures of prehistoric humans are primarily known through the excavation of stone tools and other durable artifacts, such as the Oldowan and Acheulian tool traditions.

Stone tools and imperishable artifacts serve as key archaeological evidence for understanding prehistoric cultures. Through meticulous excavation and analysis, archaeologists have been able to piece together the lifestyles, technological advancements, and social behaviors of early human societies. The term "paleolithic" refers to the Old Stone Age, a time when humans relied on stone tools as their primary implements.

The Oldowan tool tradition is considered the earliest stone tool industry, dating back around 2.6 million years ago. It is characterized by simple tools, such as choppers and scrapers, which were crafted by flaking off pieces from larger stones. These tools were primarily used for basic activities like butchering and processing animal carcasses.

Later, the Acheulian tool tradition emerged around 1.76 million years ago, representing an advancement in stone tool technology. Acheulian tools, such as handaxes and cleavers, were more refined and standardized, showcasing an increased level of sophistication in tool-making techniques. These tools served a wide range of purposes, including hunting, woodworking, and shaping raw materials.

By studying the Oldowan and Acheulian tool traditions, researchers gain valuable insights into the cognitive abilities, cultural development, and technological progress of early humans. The examination of these artifacts provides evidence of their adaptability, problem-solving skills, and the gradual refinement of their tool-making techniques over time.

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Main sequence stars with low temperatures tend to have low luminosity is based on Hertzprung-Russell diagram

The bright, hot stars in the image's upper left are the main sequence group, which stretches roughly diagonally to the lower right (dim and cool). In the bottom left are white dwarfs, which are small, faint, and hot. In the top right are giant and supergiant stars, which are big, bright, and cool.

Main sequence stars have a wide range of effective temperatures, but because they are brighter at higher temperatures, they normally follow a band from the bottom right to the top left of the diagram. Inside the cores, hydrogen and helium are fusing together.

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Answer: White dwarfs

Explanation: edge2020

Answer:

6%

Explanation:

60 g / 1000 g = 6%

The concentration of a solution in 60 g of NaCl are dissolved in 1L of water will be 6%.

The abundance of an ingredient ratio of the volume of a combination is called concentration. Mass concentration, molar concentration, number concentration, and volume concentration are all examples of mathematical descriptions.

Concentration can be calculated as:

C=m/V.

where, C is concentration , m is mass and V is volume.

It is given that, m = 60 g and V = 1L or 1000 mL.

Now, put the value of given data in above equation.

C= 60/1000

=6%.

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Answer:

thermal shock

Explanation:

the temperatures inside the glass jar should have continued to increase over time. Internal stresses due to uneven heating. This is also known as “thermal shock”.

In general, the thicker the glass, the more prone it will be to breaking due to the immediate differences in temperature across the thickness of glass.

Borosilicate glass is more tolerant of this, as it has a higher elasticity than standard silicon glass.

You may also note that laboratory test tubes and flasks are made with thinner walls, and of borosilicate glass, when designated for heating.

Answer: A copper cylinder has a mass of 76.8 g and a specific heat of 0.092 cal/g·C. It ... J ql = mwcwΔTw. ΔTw = ql/(m x c). ΔTw = 7.96 x 10. 4. J/(625 g x 4.18 J/g·K) = 30.5 ...

Explanation:

Answer:

1 C3H8 + 5 O2 --> 3 CO2 + 4 H2O

Explanation:

USE PENCIL!  Balancing equations typically requires some initial trial and error.  Making changes is common.

_ C3H8 __ O2 --> __ CO2 __ H2O

We know we can only have whole molecules, so all number coefficients must be, eventually, whole numbers.  It is OK to start with a fraction, but the final must be a shole number.  Pick the most complex molecule (either product or reactant) and assign it a coefficient of 1.

1 C3H8 __ O2 --> __ CO2 __ H2O

Now find places for each of the atoms in C3H8 on the product side.  3 carbons means we need 3CO2 molecules, so add a coeffient of 3,

1 C3H8 __ O2 --> 3 CO2 __ H2O

3 CO2 means we need 6 oxygens, so add a coefficient of 3 for the O2:

1 C3H8 + 3 O2 --> 3 CO2 __ H2O

Now find a home for the 8 hydrogens that come from the 1 C3H8.  Add 4 to the H2O product:

1 C3H8 + 3 O2 --> 3 CO2 + 4 H2O

This last step added 4 more O to the product side, so we need to adjust the reactant source of O:

1 C3H8 + 5 O2 --> 3 CO2 + 4 H2O

Double check the result:

Element   Reactant  Product

 C                   3              3

 H                   8              8

 O                  10             10(6+4)

Everything checks.

[Note that one might use a fraction such as 1/2 or 1/3 just to make the balance work.  But fractions must be converted to whole numbers for the final equation.  For 1/2, multiply all coefficients by 2.  By 3 for 1/3, etc.]

Answer: the mole

Explanation:

The mole is the unit of amount in Chemistry.

It provides a bridge between the atom and the macroscopic amounts of material that we work with in the laboratory.

the electrons of each atom will be attracted to both nuclii.

The most likely cause of earthquakes that occur in the area shown on the map is due to fault lines in the earth's crust.

Earthquakes are natural phenomena characterized by the shaking or trembling of the Earth's surface.

They occur due to the sudden release of energy in the Earth's crust along fault lines, which creates seismic waves that propagate through the Earth.

The Earth's crust is composed of several large tectonic plates that float on the semi-fluid layer of the Earth's mantle.

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The statement that is true about chemical nutrients in an ecosystem is : D.) They recycle within the ecosystem, being constantly reused. Therefore, option D) is the correct answer.

The nutrient cycle is vital to the ecosystem, and this is how nutrients are recycled in it. Nutrients that are considered chemical nutrients include carbon, hydrogen, oxygen, nitrogen, and phosphorus.What are chemical nutrients in an ecosystem

Chemical nutrients refer to essential elements that are found in an ecosystem's physical and chemical environment. These elements are necessary for life because they are responsible for different functions such as cell structure, the production of enzymes, and the production of hormones.

In conclusion, chemical nutrients recycle within the ecosystem, being constantly reused. Nutrient recycling helps to maintain the ecosystem's sustainability. It helps to maintain the balance of life forms within the ecosystem.

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Answer:

0.05 moles of Ca(OH)2

Explanation:

The formula for molarity is: mol/L = M

First, convert 200.0 mL to L.

200 mL/1000 = 0.2 L

Next, plug in the values given.

mol/0.2 = 0.250

Rearrange the equation.

mol = 0.2*0.250

mol = 0.05

If you'd like to check it, simply plug in 0.05 to mol and divide it by 0.2. In theory, you should get 0.250.

The estimation of the acidic and the basic character of a solution is called and defined by the pH. The \(\rm [H^{+}]\) concentration of the solution will be \(\rm 1.77\times 10^{-4}.\)

pH is a measurement of the free hydrogen and hydroxyl ions in the solution of the substance.

It can be calculated as:

\(\rm pH = - \rm log[H^{+}]\)

Given,

pH = 3.75

Substituting values in the equation:

\(\begin{aligned}\rm 3.75 &= -\rm log[H^{+}]\\\\\rm [H^{+}] &= 10^{-3.75}\\\\&= 1.7782 \times 10^{-4}\end{aligned}\)

Therefore,  \(\rm 1.77\times 10^{-4}\) is the concentration of the hydrogen ions.

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Answer:

1.78 x 10^nM

n= -4

Explanation:

the answer after that is A

Answer:

The atomic mass increases.

Explanation:

The third ball of 5 grams of mass will make the biggest crater in the sand because force is directly proportional to mass. so the greeter the mass, the greater its force and impact.

Mass is described as the quantity of matter in a physical body.

Mass is also a measure of the body's inertia, the resistance to acceleration when a net force is applied.

Mass is always known to be constant for a body. We can calculate mass by:

Mass = volume × density.

Weight is the measure of the gravitational force acting on a mass. The SI unit of mass is the "kilogram"

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There isn't a most favorable equivalent resonance of the Sulfate ion because they are all identical in charge and there is no change in Electronegativity between the Oxygen atoms.

What is atom?

An atom is a particle of count that uniquely defines a chemical element. Atoms include a critical nucleus surrounded with the aid of using one or greater negatively charged electrons. The nucleus is undoubtedly charged and carries one or greater quite heavy debris referred to as protons and neutrons.

Therefore, There isn't a most favorable equivalent resonance of the Sulfate ion because they are all identical in charge and there is no change in Electronegativity between the Oxygen atoms.

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