A reef that surrounds a volcanic island is an

Answer:

3.53 g

Explanation:

To convert from atoms to moles, you need to know Avogadro's number.  Avogadro's number (6.022 × 10²³) is how many atoms there are in one mole of a substance.  Use this to convert.

(1.97 × 10²² atoms) ÷ (6.022 × 10²³ atoms/mol) = 0.0327 mol

Now that you have moles, use the molar mass to convert to grams.

(0.0327 mol) × (107.87 g/mol) = 3.53 g

The mass in grams of the sample of Ag to three significant figures is 3.53 grams

The formula for calculating the number of moles of a substance is expressed as shown below:

\(moles =\frac{Mass}{Molar mass}\)

Given the following parameters

Molar mass = 107.87 g/mol.

number of atoms of the sample = 1.97 x 1022 atoms.

Get the number of moles of the substance:

Moles = 1.97 × 10²²/6.022 × 10²³ = 0.0327 mol

Get the required mass of the substance:

Mass = moles * molar mass

Mass = 0.0327 * 107.87

Mass = 3.53 grams

Hence the mass in grams of the sample of Ag to three significant figures is 3.53 grams

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Answer:

ok horita te ayudo ok esperame okey bueno

George W. Bush lol nvm just trolling.

Correct answer is Alquaida flew with 2 airplanes into the twin towers at the 11. September 2001

Answer:

This is called a solar eclipse

Explanation:

It's when the moon covers the sun

You could look up the 2016/2017 solar eclipse :)

Answer:

A solar eclipse happens when the moon gets in the way of the sun's light and casts its shadow on Earth. That means during the day, the moon moves over the sun i think it is cool

Explanation:hope it helps :)

Answer:

............................

Explanation:

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Answer:

There are 7.5 moles of salt

Explanation:

5.0M means that in every liter of solution, there are 5 moles of salt. So, 1.5L of solution times 5 moles per liter equals 7.5 moles

Answer:

1.)C₃H₈O

2)OH

3.)1-propanol

1.) C4H8O

2.) C2H6O or CH3CH2OH

3.)Ethanol

Explanation:

Hope this help

Answer:the answer is C

Explanation:

Answer:

a) elastic potential energy

b) kinetic energy

c) the forces acting on the stone are gravitational force and an upward force opposing the gravitational force.

d) potential and kinetic energy

The decreasing availability of reactants and the increasing accumulation of products, which can lead to a decrease in the collision frequency and the reaction rate.

The correct statements that describe the average rate of a reaction are:

The average reaction rate can have a negative value when expressed in terms of reactant concentrations. This is because the rate of consumption of reactants is usually higher than the rate of formation of products.
The average reaction rate depends on the time interval chosen for the calculation. Different time intervals can yield different values for the average rate. However, the instantaneous rate of the reaction is a unique value at any given time.
The expression for the average reaction rate depends on the stoichiometry of the reaction and the units of measurement. For example, for the reaction CD: average rate = -Δ[C]/Δt = Δ[D]/Δt, where [C] and [D] are the concentrations of reactant C and product D, respectively.
The average reaction rate can express the decrease in reactant particles with time, as well as the increase in product particles. This is because the rate of the reaction is proportional to the rate of change of the concentrations of both reactants and products.
The average reaction rate generally decreases with time, as the concentrations of reactants decrease and the concentrations of products increase. This is due to the decreasing availability of reactants and the increasing accumulation of products, which can lead to a decrease in the collision frequency and the reaction rate.

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Answer:

V=a3

Explanation:

sorry no explantion, but answer

Applejack, traditionally made through freeze distillation, is a method that utilizes the principles of crystal fractionation to concentrate the alcohol content in the beverage. Unlike apple brandy, which involves heating the alcohol-water mixture to separate the alcohol, applejack relies on freezing the mixture instead.

The process of making applejack using crystal fractionation involves the following steps:

1. Start with a fermented apple cider: Begin by fermenting apple juice or cider using yeast, allowing the natural sugars in the apples to convert into alcohol. The resulting fermented cider will have a relatively low alcohol content.

2. Freezing the cider: Transfer the fermented cider to a container that is suitable for freezing, such as a large, wide-mouthed vessel. Place the container in a cold environment, such as a freezer, and allow it to freeze slowly.

3. Fractionation: As the cider freezes, the water content in the mixture forms ice crystals, while the alcohol remains in the liquid state. The frozen ice crystals, which have a lower alcohol content, can be removed from the container, separating them from the alcohol-rich liquid.

4. Thawing and repeating the process: Thaw the remaining liquid, which is now more concentrated in alcohol. Repeat the freezing process multiple times to further concentrate the alcohol content. Each freeze-thaw cycle increases the alcohol concentration, gradually transforming the cider into applejack.

5. Final concentration and aging: Once the desired alcohol concentration is achieved, the applejack can be further aged, allowing the flavors to develop and mellow over time. This aging process can be done in barrels or other suitable containers.

It's important to note that the freeze distillation method used to produce applejack concentrates not only the alcohol but also any impurities or undesirable compounds present in the cider. Therefore, it is crucial to ensure that the starting cider used for fermentation is of high quality and free from any contaminants.

Additionally, it's worth mentioning that freeze distillation is regulated or prohibited in some jurisdictions due to potential safety concerns. It is always advisable to check local laws and regulations before attempting to make applejack or any other distilled beverage using this method.

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Dietary protein will not be digested if Hcl were not being produced in sufficient quantities.

In the stomach, there are some glands found on the stomach lining that helps to release hydrochloric acid (HCl). Their major role is to dissolve food and produce an acidic medium.

The acidic media promotes and improves the conversion of pepsinogen to pepsin. Pepsin acts as an enzyme that supports protein digestion.

Protein digestion requires a pH of around 1.8 which can be achieved by the secretion of HCl.

As a result, if HCI is not released in the stomach in sufficient quantities, pepsin will not be activated and it would have a detrimental impact on protein digestion.

Therefore, we can conclude that dietary protein will not be digested if Hcl were not being produced in sufficient quantities.

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Answer:

36

Explanation:

Se has a negative charge of -2

in order for that to be possible there has to be 2 more negative charges than positive chrages

in other words

34 protons 36 electrons

34+ 36-

The compound in the brain that is mimicked by THC is called anandamide (option A).

THC (delta-9-tetrahydrocannabinol) is the active compound found in marijuana that produces psychoactive effects. It mimics the action of naturally occurring compounds in the brain called endocannabinoids. One such endocannabinoid is anandamide. Anandamide binds to cannabinoid receptors in the brain, primarily CB1 receptors, and regulates various physiological processes such as mood, pain perception, appetite, and memory. THC, being structurally similar to anandamide, binds to the same receptors and produces similar effects. Option A, anandamide, is the compound in the brain that THC mimics, making it the correct answer. Options B (2AG), C (CBD), D (dopamine), and E (cyclic AMP) are unrelated to the compound mimicked by THC.

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Constitutional isomers are the isomer type that we are now most familiar with. The molecular formulas of these compounds are identical.

A geometric isomer can be used to indicate how a functional group in a molecule is oriented.

The atoms in a geometric isomer are frequently connected by a non-rotating double bond, but it's also possible that the ring structure may be important.

Based on the placement of the functional group, the isomers are distinguished by the labels cis and trans.

Cis/trans isomers and geometric isomers are examples of isomers.

The two main primary sources of geometric isomers are double bonds and ring structures.

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The best electrode for saltwater batteries that will not corrode easily is copper and zinc.

The values of half-cell potentials are used to make the electrodes that do not corrode easily. If the salt concentrations at the two electrodes were different, you could still get voltage and current from a cell even if the anode and cathode were formed of the same metal.

Due to its high efficiency and suitability for seawater, copper is frequently employed as the cathode in galvanic cells. Additionally, in a seawater battery, zinc and aluminum can function as inert anodes and produce large levels of electricity.

A liquid saltwater solution is used in saltwater batteries to collect, store, and finally release energy. Copper and zinc are frequently utilized as the cathode in galvanic cells due to their high efficiency and suitability for seawater.

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0.9 moles of aluminum will be used when reacted with 1.35 moles of oxygen based on this chemical reaction.

In chemistry, a mole, usually spelt mol, is a common scientific measurement unit for significant amounts of very small objects like molecules, atoms, or other predetermined particles. The mole designates 6.02214076 1023 units, which is a very large number.

For the Worldwide System of Units (SI), the mole is defined as this number as of May 20, 2019, according to the General Convention on Measurements and Weights. The total amount of atoms discovered through experimentation to be present in 12 grammes of carbon-12 was originally used to define the mole.

4Al + 6O\(_2\) → 2Al\(_2\)O\(_3\)

moles of oxygen =  1.35 moles

moles of al = (4/6)×  1.35 =0.9 moles

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Explanation:

colloid is a mixture in which one substance of microscopically dispersed insoluble particles are suspended throughout another substance. However, some definitions specify that the particles must be dispersed in a liquid,[1] and others extend the definition to include substances like aerosols and gels. The term colloidal suspension refers unambiguously to the overall mixture (although a narrower sense of the word suspension is distinguished from colloids by larger particle size). A colloid has a dispersed phase (the suspended particles) and a continuous phase (the medium of suspension). The dispersed phase particles have a diameter of approximately 1 nanometre to 1 micrometre.[

hope it helps.

Answer:

colloids are mixtures in which one or more substances are dispersed as relatively large solid particles or liquid droplets throughout a solid ,liquid or gaseous medium .The particles of a colloid remain and do not settle due to gravity ,and they are often electrically charged

A spontaneous reaction is one in which the change in free energy is negative and the standard cell potential is positive.

For a redox reaction to be spontaneous, the electrode potential of the cell must be positive and this depends on the relative electrode potentials of the species involved in the reaction. A metal can not displace a metal above it in the electrochemical series from solution.

Based on this;

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The relative atomic mass of hydrogen 1.00

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit

Here given data is

99.30% of H atoms

0.70% H atoms

So we have to calculate the relative atomic mass of hydrogen. = ?

So the relative atomic mass = (isotope abundance × isotope mass) + (isotope abundance × isotope mass)

Relative atomic mass = (99.30% × 1) + (0.70% × 1)

Relative atomic mass = 1.00

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The evidence that refutes the statement is: 4 EVIDENCE: Scientists have observed galaxies are moving away from us.

According to the observations made by astronomers, galaxies in the universe are not only moving away from each other, but they are also moving away from us.

This phenomenon is known as the expansion of the universe, and it contradicts the idea that all matter and energy in the universe was initially concentrated in a tiny corner of space during the time of the big bang and has since filled up the entire universe.

The observation that galaxies are moving away from us suggests that the universe is expanding in all directions. This expansion implies that the universe was not initially confined to a specific location but rather underwent a rapid expansion from a highly dense and hot state.

Therefore, the idea that all matter and energy in the universe was initially concentrated in a small corner of space and then expanded to fill up the whole universe is inaccurate based on the evidence of the observed expansion of galaxies. Evidence 4

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Answer:  " 13.5 g Al " ;

                    →  that is:  "13.5 grams of aluminum."

____________________________

Explanation:

____________________________

Note: What is missing from the question is the "balanced chemical equation" for the "chemical reaction" that contains:

 The reactants:  "aluminum (Al) " ;  and "chlorine (Cl) " ;  and:

 The product:    "aluminum choloride (AlCl₃) " .

____________________________

The "balanced chemical equation" is:

____________________________

        2 Al   +   3 Cl₂   →   2 AlCl₃   ;

_____________________________

Note: The molecular weight of "aluminum (Al)" is:   " 26.98 g /mol " .

____________________________

So:  We call solve using a technique known as:  "dimensional analysis" :

____________________________

  0.500 mol AlCl₃ * \((\frac{2mol Al}{2mol AlCl_{3} }) * (\frac{26.98g Al}{1 mol Al}) = ?\)

____________________________

Note:  The units of "mol AlCl₃" cancel out to "1' ; and:

          The  units of "mol Al" cancel out to "1" ; and we are left with:

____________________________

 " \(\frac{(0.500 * 2 * 26.98)}{2}\)   g Al ["grams of aluminum"] ;

____________________________

Note: We can "cancel out the "2's" ; since "2/2 = 1 " ; and we have:

 →  (0.500 * 26.98) g Al ;

    = 13.49 g Al ;

         →  Round to 3 (Three) significant figures;

         →  Since:  "0.500" has 3 (Three) significant figures:

____________________________

   =  13.5 g Al ; that is:  "13.5 grams of aluminum."

____________________________

 Hope this is helpful!  

      Best wishes to you in your academic pursuits—and within the "Brainly" community!

____________________________

Based on the calculations, the pH of a 0.47 M solution of carbonic acid (H₂CO₃) is equal to 3.35.

First of all, we would write a properly balanced chemical equation for these chemical reactions:

                   H₂CO₃(aq)  ⇄ HCO₃⁻(aq) + H⁺(aq);   Ka₁ = 4.3 × 10⁻⁷.

For the second chemical reaction:

                   HCO₃⁻(aq) ⇄ CO₃²⁻(aq) + H⁺(aq);      Ka₂ = 5.6 × 10⁻¹¹.

Next, we set up an equation from the ICE table;

[HCO₃⁻] = [H⁺] = x.

[H₂CO₃] = 0.47 - x.

Ka₁ = ([HCO₃⁻] × [H⁺])/[H₂CO₃].

4.3 × 10⁻⁷ = (x × x)/(0.47 - x).

4.3 × 10⁻⁷ = x²/(0.47 - x).

x² = 0.0000002021 - 4.3 × 10⁻⁷x

x² + 4.3 × 10⁻⁷x - 0.0000002021 = 0

By solving the quadratic equation, we have:

x = [H⁺] =0.000449 M.

Now, we can determine the pH by using this formula;

pH = -log[H⁺]

pH = -log(0.000449 M).

pH = -(-3.35)

pH = 3.35.

Note: The second dissociation from Ka₂ would be so small, so it's considered negligible.

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Explanation:

There are several pieces of evidence that can be used to identify chemical changes, other than a change in color. Some of these include the production of a gas, the formation of a precipitate, a change in temperature, and a change in the state of matter (e.g. from a solid to a liquid or vice versa). For example, if a solid substance is added to a liquid and bubbles of gas are produced, this is evidence of a chemical change. Similarly, if two clear solutions are mixed together and a solid precipitate forms, this is also evidence of a chemical change. Additionally, if a substance is heated and it changes from a solid to a liquid or from a liquid to a gas, this is also evidence of a chemical change.

The amount of the compound \(XY_2\) that can be generated would be 11.28 grams

From the equation of the reaction, the mole ratio of X and Y is 1:1.

Mole of 3.5 grams of X = 3.4/24 = 0.1417 moles

Mole of 4.2 grams of Y = 4.2/35 = 0.12 moles

Thus, Y is the limiting reactant because it is present in a lower amount than needed.

Mole ratio of Y and  \(XY_2\) = 1:1

Equivalent mole of  \(XY_2\) = 0.12 moles

Molar mass of  \(XY_2\) = 24 + (35x2) = 94 g/mol

Mass of 0.12 moles of  \(XY_2\) = 0.12 x 94 = 11.28 grams

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HCI + NaOH --> NaCl + H2O

Neutralization reaction is the reaction between acid and base which results in formation of salt and water. Here salt is NaCl (common salt) in above reaction.

SO, (A) H20 + NaCl is your answer.

Answer:3.381 X 10^(-11)

Explanation:

The formula for buoyant force is F = -Volume*density*gravitational acceleration. Convert volume and density to SI units and then apply them in the formula where gravitational acceleration is 9.8m/s^2. Done

The traits that the offspring got were taken from the parents.

Offspring get traits from their parents through the process of inheritance. Traits are determined by genes, which are segments of DNA that contain the instructions for building and maintaining an organism's body and traits.

Each parent contributes half of their genes to their offspring through their gametes, which are reproductive cells such as sperm and eggs. When a sperm fertilizes an egg, the resulting zygote has a complete set of genes from both parents.

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Answer:

the amount of matter in the bowling ball remains the same

Explanation:

The reason why the mass of the bowling ball on earth and moon remains the same is that matter in the bowling ball remains the same.

Mass of any substance is the amount of matter it contains.