Write the complete chemical symbol for the neutral element
that contains 7 electrons, and 9 neutrons.

Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

For more such questions on molecules

https://brainly.com/question/1351818

#SPJ8

Exactly 149.6J will raise the temperature of 10.0g of a metal from 25.0C. The specific heat capacity of the metal is 5.984 J/g°C.

The heat capacity of a sample of a substance divided by the mass of the sample yields the specific heat capacity (symbol c), also known as massic heat capacity. Informally, it is the quantity of heat that must be added to one unit of a substance's mass in order to raise its temperature by one unit. The specific heat capacity unit in the SI is the joule per kelvin per kilogram, or Jkg⁻¹K⁻¹. For instance, the specific heat capacity of water is 4184 J kg⁻¹K⁻¹, or the amount of energy needed to raise 1 kilogram of water by 1 K.

The specific heat capacity of the metal can be calculated using the equation Q = m × c ×ΔT.

Q = 149.6J

m = 10.0g

ΔT = (final Temperature - initial Temperature) = (25°C - 0°C) = 25°C

Plugging these values into the equation, we get:

149.6J = 10.0g × c ×25°C

Solving for c, we get:

c =  \(\frac{149.6J}{(10.0g *25C)}\)

c = 5.984 J/g°C

Therefore, the specific heat capacity of the metal is 5.984 J/g°C.

To know more about specific heat capacity, visit:

https://brainly.com/question/29766819

#SPJ1

Answer:

Ice melting is a physical change, and the mass of the substance remains the same.

Explanation:

Hello!

In this case, since the phase transitions from solid to liquid, liquid to gas, solid to gas and vice versa are physical changes by which the molecules change their arrangement, being close for solids, not so close, not so far for liquids and spread for gases, the more the energy added, the more separated the molecules they turn out.

However, when the appropriate amount of energy is added, the mass of the changing substance remains the same and the change takes place, it means that the correct answer, when ice melts, is ice melting is a physical change, and the mass of the substance remains the same.

Best regards

Answer:

its b

Explanation:

Answer:

b, c, e

Explanation:

Inorganic compounds usually lack carbon.

Inorganic compounds are not associated with or made from living things.

Inorganic compounds include salt and water​.

Answer:

yes the answer id bce

Explanation:

Stars form in large, dense regions of gas and dust known as molecular clouds. These clouds are located primarily in the spiral arms of galaxies, where they are exposed to intense radiation from nearby stars. As the gas and dust in these clouds are subjected to this radiation, they begin to collapse under their own gravity. As the collapse continues, the cloud becomes denser and denser, and eventually a protostar forms at its center. Over time, this protostar continues to contract and heat up, eventually reaching the point where nuclear fusion can begin in its core. At this point, the protostar becomes a fully-fledged star, and the process of star formation is complete.

TL;DR: Within the clouds of dust and scattered throughout most galaxies.

The acid ionization steady of HCIO₂ (chlorous corrosive) can be spoken to by the taking after condition:

HCIO₂ + H₂O ⇌ H₃O⁺ + CIO₂⁻

The harmony steady expression for this response is:

Ka = [H₃O⁺][CIO₂⁻] / [HCIO₂]

The esteem of the acid ionization consistent (Ka) for HCIO₂ is roughly

1.1 x 10^-2 at 25°C.

It is critical to note that the esteem of Ka can change with temperature, and it is additionally subordinate on the dissolvable utilized.

Learn more about acid ionization constant

https://brainly.com/question/3075008

#SPJ1

Answer:The process by which modern organisms have descended from ancient organisms over time

Common ancestor An ancestor shared by two or more descendant species

Natural selection Evolutionary mechanism in which individuals that are better suited to their environment survive and reproduce most successfully

Variation Difference between traits in individuals of the same species

Adaptation A trait that improves an organism's ability to survive and reproduce in an environment

Fitness The ability of an organism to survive and reproduce

Artificial selection Selective breeding of organisms to promote the appearance of desirable traits in offspring

Genetic drift A mechanism of evolution in which allele frequencies of a population change over generations due to chance

Darwin's theory of evolution

Charles Darwin developed a theory of evolution to explain the unity and diversity of life, based on the idea of shared common ancestors.

Natural selection

Darwin's theory was based on the mechanism of natural selection, which explains how populations can evolve in such a way that they become better suited to their environments over time.

Light colored mice are more easily seen by predators and are therefore preyed upon more. Dark mice are better adapted to their environment and better able to survive and reproduce.

Light colored mice are more easily seen by predators and are therefore preyed upon more. Dark mice are better adapted to their environment and better able to survive and reproduce.

Natural selection acting on mice population over time.

Individuals have variations within their heritable traits. Some variations make an individual better suited to survive and reproduce in their environment.

If this continues over generations, these favorable adaptations (the heritable features that aid survival and reproduction) will become more and more common in the population.

The population will not only evolve (change in its genetic makeup and inherited traits), but will evolve in such a way that it becomes adapted, or better-suited, to its environment.

Artificial selection

There are other types of selection, in addition to natural selection, that are out there in the world.

Artificial selection, also called "selective breeding”, is where humans select for desirable traits in agricultural products or animals, rather than leaving the species to evolve and change gradually without human interference, like in natural selection.

A timeline showing how dogs became domesticated over a long period of time due to artificial selection.

A timeline showing how dogs became domesticated over a long period of time due to artificial selection.

Dog breeding is a perfect example of how humans select for desirable or fashionable traits. Breeders deliberately mate parents with the hope of producing offspring with specific traits (such as color, size, ear shape, snout length, and so on).

Common mistakes and misconceptions

Evolution is not the same as adaptation or natural selection. Natural selection is a mechanism, or cause, of evolution. Adaptations are physical or behavioral traits that make an organism better suited to its environment.

Heritable variation comes from random mutations. Random mutations are the initial cause of new heritable traits. For example, a rabbit can't choose to have a different fur color. Rather, a genetic mutation causes a difference in fur color, which may help that rabbit hide better in its environment.

Natural selection acts on existing heritable variation. Natural selection needs some starting material, and that starting material is heritable variation. For natural selection to act on a feature, there must already be variation, and that variation must be able to be passed on to offspring.

Natural selection depends on the environment. Natural selection doesn't favor traits that are somehow inherently superior. Instead, it favors traits that are beneficial in a specific environment. Traits that are helpful in one environment might actually be harmful in another.

Explanation:

Answer:

C

Explanation:

It is C

Answer:

\(2Cr_2O_3(s)+3C(s)\rightarrow 3CO_2(g)+4(s)\)

Explanation:

Hello.

In this case, since chromium (III) oxide and solid carbon are respectively Cr₂O₃ and C, the corresponding chemical reaction to yield solid chromium and oxygen is:

\(Cr_2O_3(s)+C(s)\rightarrow CO_2(g)+Cr(s)\)

However, since two chromium atoms are present at the reactants yet one at the products and three oxygen atoms at the reactants and two at the products, we need to balance it as follows:

\(2Cr_2O_3(s)+3C(s)\rightarrow 3CO_2(g)+4(s)\)

Best regards!

To balance a reaction means to make the number of atoms the same on both the reactants and products side.

The balanced reaction involved in the reaction is:-

\(2Cr_{2}O_{3} \ + 3C -----> 3Co_{2}\ + 4Cr\)

The steps for balancing the equation is as follows:-

By following these steps, you can balance the reaction.

For more information, refer to the link:-

https://brainly.com/question/12271256

Answer:

lt serves as a home where crews of astronauts and cosmonauts live. The space station is also a unique science laboratory. Several nations worked together to build and use the space station. The space station is made of parts that were assembled in space by astronauts.

Explanation:

The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.

Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.

Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.

It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.

for more such questions on symptom

https://brainly.com/question/21078887

#SPJ8

Type #1 Flame symbols are among the WHMIS emblems.

Type 2: Symbols with a flame above a circle.

Exploding bomb symbols are of type 3.

Compressed gas symbols are of type 4.

Corrosion symbols are type #5.

Skull and water the water symbols are type #6.

Exclamation mark symbols are type #7.

Health hazard symbols are type #8.

Because workplaces require a defined technique to detect hazardous items, WHMIS labels are crucial.

The national ’s hazard standard for Canada is the Health And Safety At work System (WHMIS). Hazard categorization, cautionary container labeling, the distribution of safety data sheets, and worker information and training programs are the system's main components.

The U.S. Ohs Hazard Identification Standard and WHMIS are quite similar.

To know more about WHMIS visit:

https://brainly.com/question/28542158

#SPJ1

Answer:

872.97

Explanation:

6.27 x 101 + 2.35 x 102

First, let's do the multiplication before you add them

6.27 x 101 = 633.27

2.35 x 102 = 239.7

Now that we simplified them, we can add them together

633.27 + 239.7

872.97

Hope this helped!

Have a supercalifragilisticexpialidocious day!

Answer:

\(f=7.09 s^{-1}=7.09 Hz\)

Explanation:

Hello.

In this case, since the frequency of the mechanical way is computed considering its velocity and wavelength in SI units:

\(f=\frac{\lambda }{v}\)

We can compute it for a 12.02-m wavelength and 1.70-m/s velocity as shown below:

\(f=\frac{12.05m}{1.70m/s}\\ \\f=7.09 s^{-1}=7.09 Hz\)

Which measured in s⁻¹ or Hz.

Best regards.

1.2 × 10²⁴ atoms C

Chemistry

Atomic Structure

Stoichiometry

Math

Pre-Algebra

Order of Operations: BPEMDAS

Step 1: Define

Identify variables

[Given] 24 g C

[Solve] atoms C

Step 2: Identify Conversions

Avogadro's Number

[PT] Molar Mass of C: 12.01 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

1.2034 × 10²⁴ atoms C ≈ 1.2 × 10²⁴ atoms C

Answer:

0.012 mol

Explanation:

Step 1: Given data

Atoms of sulfur: 7.0 × 10²¹ atoms

Step 2: Calculate the moles corresponding to 7.0 × 10²¹ atoms of sulfur

In order to convert atoms to moles, we need a conversion factor. In this case, we will use Avogadro's number: there are 6.02 × 10²³ atoms of sulfur in 1 mole of atoms of sulfur.

7.0 × 10²¹ atoms S × 1 mol S/6.02 × 10²³ atoms S = 0.012 mol S

The mass of hydrogen needed to produce 51.0 grams of ammonia is  ≈ 9.07 grams.

To determine the mass of hydrogen required to produce 51.0 grams of ammonia (NH3) using the Haber process, we need to calculate the stoichiometric ratio between hydrogen and ammonia.

From the balanced chemical equation:

3 H₂(g) + N₂(g) → 2 NH₃(g)

We can see that for every 3 moles of hydrogen (H₂), we obtain 2 moles of ammonia (NH₃).

First, we need to convert the given mass of ammonia (51.0 grams) to moles. The molar mass of NH₃ is 17.03 g/mol.

Number of moles of NH₃ = Mass / Molar mass

                     = 51.0 g / 17.03 g/mol

                     ≈ 2.995 moles

Next, using the stoichiometric ratio, we can calculate the moles of hydrogen required.

Moles of H₂ = (Moles of NH₃ × Coefficient of H₂) / Coefficient of NH₃

           = (2.995 moles × 3) / 2

           ≈ 4.493 moles

Finally, we can convert the moles of hydrogen to mass using the molar mass of hydrogen (2.02 g/mol).

Mass of H₂ = Moles × Molar mass

          = 4.493 moles × 2.02 g/mol

          ≈ 9.07 grams

Therefore, approximately 9.07 grams of hydrogen is needed to produce 51.0 grams of ammonia in the Haber process.

Know more about the mass of hydrogen here:
https://brainly.com/question/14083730

#SPJ8

There are approximately \(2.76 * 10^{24\) ammonia molecules in the given sample.

To calculate the number of ammonia molecules in the sample, we need to use Avogadro's number and the molar mass of ammonia.

The molar mass of ammonia \((NH_3)\) can be calculated by adding up the atomic masses of nitrogen (N) and hydrogen (H):

Molar mass of \(NH_3\) = (1 x atomic mass of N) + (3 x atomic mass of H)

              = (1 x 14.01 g/mol) + (3 x 1.01 g/mol)

              = 14.01 g/mol + 3.03 g/mol

              = 17.04 g/mol

Now, we can calculate the number of moles of ammonia in the sample using the formula:

Number of moles = Mass of the sample / Molar mass

Number of moles = 78.25 g / 17.04 g/mol

              ≈ 4.5865 mol (rounded to four decimal places)

Finally, we can use Avogadro's number, which represents the number of particles (atoms, molecules, etc.) in one mole of a substance. Avogadro's number is approximately \(6.022 * 10^{23\) particles/mol.

Number of ammonia molecules = Number of moles x Avogadro's number

Number of ammonia molecules ≈ 4.5865 mol x (\(6.022 * 10^{23\) molecules/mol)

                           ≈ \(2.76 * 10^{24\) molecules (rounded to two significant figures)

Therefore, the provided sample contains roughly \(2.76 * 10^{24\) ammonia molecules.

Learn more about moles on:

https://brainly.com/question/24748125

The number of ammonia molecules in the sample is approximately 2.764 x \(10^{24}\) molecules.

To calculate the number of ammonia molecules in a given sample, we need to use Avogadro's number and the molar mass of ammonia.

The molar mass of ammonia (NH3) is calculated as follows:

Molar mass of N = 14.01 g/mol

Molar mass of H = 1.01 g/mol

Total molar mass of NH3 = 14.01 g/mol + (3 * 1.01 g/mol) = 17.03 g/mol

Now, we can calculate the number of moles of ammonia in the sample:

Number of moles = Mass of sample / Molar mass of NH3

Number of moles = 78.25 g / 17.03 g/mol = 4.594 moles

Next, we use Avogadro's number, which states that there are 6.022 x \(10^{23}\) molecules in one mole of a substance.

Number of molecules = Number of moles * Avogadro's number

Number of molecules = 4.594 moles * 6.022 x \(10^{23}\) molecules/mol = 2.764 x \(10^{24}\) molecules

Therefore, there are approximately 2.764 x \(10^{24}\) ammonia molecules in the given sample of 78.25 g.

Know more about Avogadro's number here:

https://brainly.com/question/1513182

#SPJ8

Balancing a chemical equation is the process of ensuring that the number of atoms of each element in the reactants is equal to the number of atoms of that same element in the products.

Balance the chemical eqations given in the problem?

Chemical equations are used to describe the reactants and products in a chemical reaction. These equations are written using chemical formulas and symbols, indicating the types and numbers of atoms or molecules involved in the reaction. However, these equations must be balanced to obey the law of conservation of mass, which states that the total mass of the reactants must equal the total mass.

To learn more about chemical equation, visit: https://brainly.com/question/29886207

#SPJ1

Answer:

A.endoplamic reticulum

Explanation:

The endoplamic reticulum  is an important organelle in protein synthesis. The nucleus contains DNA, which is the template for transcription of mRNA. mRNA acts as a message, which leaves the nucleus to become translated into proteins.

The endoplasmic reticulum is important in the synthesis, folding, and modification of proteins.  

The expected observations for the chemical reaction involving lead nitrate and potassium iodide are as follows as per theory.

Before the reaction, you'd have two separate solutions:

Lead Nitrate solution: This is typically a clear, colorless solution.

Potassium Iodide solution: This is also usually a clear, colorless solution.

REACTION OBSERVATIONS:

As soon as you combine these two solutions, a chemical response takes place, resulting in the almost instantaneous development of a yellow precipitate. Lead iodide is a substance that cannot be dissolved in water.

FINAL APPEARANCE:

The final mixture would have a yellow precipitate (lead iodide) suspended in the solution.

The reaction leads to the formation of lead iodide, a substance with distinctive properties, suggesting a chemical change. The presence of this novel compound is indicated by the yellow hue of the precipitate.

Read more about chemical change here:

https://brainly.com/question/1222323
#SPJ1

The element which has undergone reduction is Manganese (Mn)

From the question, we are to determine which element has undergone reduction

First, we will define the terms oxidation and reduction

Oxidation  

Oxidation can be defined as gain of oxygen. It can also be defined as an increase in oxidation state

Reduction  

Reduction can be defined as loss of oxygen. It can also be defines as a decrease in oxidation state.

Now, we will determine the oxidation numbers of the elements both in the reactants and products sides

The oxidation state of Fe changed from +2 to +3. An increase in oxidation state indicates oxidation

The oxidation state of Cl did not change. It is -1 both in the reactants and products sides

The oxidation state of K did not change. It is +1 both in the reactants and products sides

The oxidation state of Mn changed from +7 to +2. A decrease in oxidation state indicates reduction.

Hence, the element which has undergone reduction is Manganese (Mn).

Learn more on Redox reaction here: https://brainly.com/question/14461330

NOTE: The oxidation states of O and H (oxygen and hydrogen) did not change.

Answer:

active listening

compassion

understanding resources

Explanation:

from my own opinion

The heat change (in J) in the reaction is -8403.6 J.

The heat change of a reaction is the heat that is given off or absorbed in the reaction when product molecules are formed by reactant molecules.

In a reaction where heat is absorbed during the formation of products, the heat change is positive and the reaction is said to be endothermic.

On the other hand, in a reaction where heat is given off during the formation of products, the heat change is negative and the reaction is said to be exothermic.

The heat change of the reaction is calculated below:

Heat change = mass * heat capacity * temperature change

mass of mixture = 45. 5 + 55.5

mass of mixture = 100 g

Heat change = 100 * 5.64 * (5.6 - 20.5)

Heat change = -8403.6 J

Learn more about heat change at: https://brainly.com/question/24298104

#SPJ1

Answer:

A

Explanation:

has properties that are different from the original substances.

Answer:

.853 M

Explanation:

(72.1 g / 342.3 g/mole) / (246.8 ml /1000 ml/l )= .853 M

Answer:

sodium perchorate is NaCLO4

calcium sulfite CaSO3

potassium hydroxide KOH

lithium nitrate LiNO3

Explanation:

sodium perchorate has one Sodium

one Chlorine and 4 Oxygen

calcium sulfite has one Calcium on sulfate and 3Oxygen

lithium nitrate has one Lithium oneNitrogen

3 Oxygen

Answer:

potassium and calcium

The mass (in grams) of chlorine gas is needed to react with 251 grams of iron is 479 grams. Option C.

To determine the mass of chlorine gas needed to react with 251 grams of iron, we need to use the stoichiometry of the balanced chemical equation:

2Fe + 3Cl2 → 2FeCl3

From the balanced equation, we can see that 2 moles of iron (Fe) react with 3 moles of chlorine gas (Cl2) to produce 2 moles of iron(III) chloride (FeCl3).

To calculate the mass of chlorine gas, we can follow these steps:

Step 1: Convert the given mass of iron (Fe) to moles.

Using the molar mass of iron (Fe), which is approximately 55.85 g/mol, we can calculate the number of moles of iron:

moles of Fe = mass of Fe / molar mass of Fe

moles of Fe = 251 g / 55.85 g/mol

moles of Fe ≈ 4.5 mol (rounded to one decimal place)

Step 2: Use the mole ratio from the balanced equation to find the moles of chlorine gas (Cl2) needed.

From the balanced equation, we know that 2 moles of Fe react with 3 moles of Cl2. Therefore, the moles of Cl2 can be calculated as:

moles of Cl2 = (moles of Fe / 2) * 3

moles of Cl2 = (4.5 mol / 2) * 3

moles of Cl2 ≈ 6.75 mol (rounded to two decimal places)

Step 3: Convert the moles of chlorine gas to grams.

Using the molar mass of chlorine gas (Cl2), which is approximately 70.90 g/mol, we can calculate the mass of chlorine gas:

mass of Cl2 = moles of Cl2 * molar mass of Cl2

mass of Cl2 = 6.75 mol * 70.90 g/mol

mass of Cl2 ≈ 479 grams (rounded to the nearest whole number) Option C is correct.

For more such question on mass. visit :

https://brainly.com/question/19385703

#SPJ8

Answer:

The phenomenon of change from one state of matter to another and then back to the original state is called the inter-conversion of states of matter.