Which two elements do not have a second energy level at all?

For  a penny having mass 2.5559g dissolved in hno3 and solving from the process as given in the question we get that the penny has 2.64% of copper (Cu) by mass in it

Mass of penny mp = 2.5559g

concentration of Cu in solution = 1.06 * 10^(-2) mol/L

therefore 100ml diluted solution has

n = 1.06*10^(-2) * 100 / 1000 = 1.06 * 10^(-3) mol of copper

The molecular weight of copper mw = 63.5 g/mol

mass of copper Mcu = n * mw(molecular weight of copper)

⇒Mcu = 1.6 * 10^(-3) mol * 63.5 g/mol

⇒Mcu = 0.06731 g

Percentage by mass of copper in the penny, P= (Mcu/ mp)* 100%

⇒ P = (0.06731/2.5559)* 100 %

⇒P = 2.64%

∴There is 2.64% copper by mass in the penny

Problem to find out the mass percentage of a metal:

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To solve this problem, we must take into account Avogadro's number. Avogadro's number tells us that in one mole of any substance there are 6.022x10^23 atoms. Applying this relationship we have that the moles of potassium (K) are:

Now, to go from moles to grams, we must multiply the moles by the molar mass of potassium. The molar mass of potassium is 39.1g/mol. So, the grams of potassium will be:

Answer: In 3.4x10^23 atoms of potassium there are 22.1 grams

When sodium reacts with water, hydrogen gas evolves (option C).

A chemical reaction is a reaction that typically involves the breaking or making of interatomic bonds, in which one or more substances are changed into others.

A chemical reaction combines two or more substances called reactants to form new substances called products.

According to this question, sodium (Na) reacts with water (H2O) as follows:

2Na + 2H₂O → 2NaOH + H₂

As observed in the above chemical reaction, sodium metal reacts with water to produce sodium hydroxide and hydrogen gas.

Therefore, it can be said that hydrogen gas is evolved when sodium combines chemically with water.

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Answer: 4.3

Explanation:

You read from the bottom of the meniscus and each line equals .1 so it reads 4.3.

Alanine is a member of the twenty key amino acids which might be used by our bodies to make proteins: Pyrrolysine (not utilized in human protein synthesis). of those 20 amino acids, nine amino acids are crucial: Phenylalanine. Valine. Tryptophan.

Alanine is an amino acid that is used to make proteins. it's miles used to break down tryptophan and diet B-6. it's miles a source of power for muscle mass and the central fearful gadget. It strengthens the immune device and helps the frame use sugars.

Alanine, or α-alanine, is an α-amino acid this is used in the biosynthesis of proteins. It contains an amine organization and a carboxylic acid organization, both connected to the valuable carbon atom which also contains a methyl institution facet chain. Alanine is an amino acid this is used to make proteins. it's miles used to interrupt down tryptophan and diet B-6. it's miles a supply of electricity for muscle tissue and the critical apprehensive gadget. It strengthens the immune system and allows the frame to use sugars.

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Answer: type the compound into your search bar then it should tell you what it is for 3. you should look up "what is the formula for -----" same thing for #4

Explanation:

Answer:

2.a.  germanium tetrahydride

2.b. dinitrogen tetrabromide

2.c. diphosphorus pentasulfide

2.d. selenium dioxide

2.e. nitrogen trihydride

2.f. silicon dioxide

3.a. PO3

3.b. SiCl4

3.c. N2O5

3.e. N2O4

3.f. CO

4.a CO2

4.b. SF6

4.c. N2Cl4

4.d. CI4

4.e. PF5

4.f. P2O5

****All numbers are subscripts, please do not write them as is, but to the bottom right of them like shown in the options from question 2.

Explanation:

To name covalent compounds (NM+NM), we use prefixes.

To name covalent compounds goes as follows:

First, name the first element in the formula the normal name it has (ex. Nitrogen, Oxygen). If the first element is present more than once shown by a subscript, use a prefix that will indicate how many there are present (ex. mono, di, tri).

Next, name the second element in the compound using prefixes aswell if present more than once. These elements though, will end with -ide instead of their original name (ex. monoxide, dibromide, trichloride).

The number of atoms of hydrogen contained in the molecular formula of the compound is 6 atoms

We'll begin by obtaining the formula of the compound. This can be obtained as follow:

Divide by their molar mass

C = 92.3 / 12 = 7.7

H = 7.7 / 1 = 7.7

Divide by the smallest

C = 7.7 / 7.7 = 1

H = 7.7 / 7.7 = 1

Thus, the empirical formula of the compound is CH

Finally, we shall determin the number of atoms of hydrogen present in the compound. This can obtained as follow:

When 1 atom of carbon was present, 1 atom of hydrogen was also present.

Therefore,

When 6 atoms of carbon is present, then 6 atoms of hydrogen are also present.

Thus, we can conclude that the number of atoms of hydrogen is 6 atoms

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Temperature change for water was slight compared to temperature change in metal because of specific heating capacities.

Specific heat capacity, moreover, known basically as specific heat, is the degree of the warm vitality required to extend the temperature of a unit amount of a substance by a certain temperature interim.

Regularly, the metal pole would be much hotter than the water. So, the conclusion can be made that the particular warm of metal is lower than the particular warm of water.

It requires less warm per unit mass to form a more noteworthy alteration in temperature for metal than it does for water.

Specific heat is additionally some of the time alluded to as heat capacity.

Casually, it is the sum of warm that must be included in one unit of mass of the substance in arrange to cause an increment of one unit in temperature. The SI unit of particular warm capacity is joule per kelvin per kilogram, J⋅kg −1 ⋅K −1.

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The distance between the earth and star = 8 ✕ (9.46 ✕ 1012) = 7.6 ✕ 1013 km.

What is exoplanet?

Every planet in our solar system orbits the Sun. Planets known as exoplanets orbit other stars. It is quite challenging to directly observe exoplanets with telescopes. They are hidden by the bright light from the stars they orbit.

It is challenging to give distances in kilometers for many celestial objects since they are so far away from the earth, such as galaxies or stars.

How far light may travel in a year is measured in large units called light-years. The vast distances are therefore expressed in terms of light-years.

9.46 x 1012 kilometres make up a light year.

In other words, if a star is eight light-years away, light would travel that distance in eight years. This is how the distance between a star and the earth is calculated.

Therefore, the distance between the earth and the star is 8 (9.46 1012) = 7.6 1013 kilometers.

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Both transition metals and alkali metals are good conductors of heat and electricity, react with water, and are easily oxidized.

The alkali metals are elements of group 1 which are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).  They are also known as the s-block elements because they have their outermost electron in an s-orbital.

The alkali metals are shiny, soft, highly reactive metals and readily lose their outermost electron to create cations with charge +1. They can tarnish rapidly in the air due to oxidation by atmospheric moisture and oxygen.

Transition elements or transition metals are elements that have partially filled d-orbitals. An element having a d-subshell that is partially filled with electrons or can form stable cations with an incompletely filled d orbital.

Any element present in the d-block of the modern periodic table which consists of groups 3 to 12, is considered to be a transition element. For example, the mercury in the +2 oxidation state, corresponds to an electronic configuration of (n-1)d¹⁰. Many paramagnetic compounds are formed by transition metals because they have unpaired electrons in the d orbital.

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The heat released by metal and added to water is the same which is 1039.83 joule.

The equilibrium condition of the system depends on the heat released from both gold and water. The total heat received by the system will equal to total heat released by objects. It should follow

Q released = Q received

The heat can be defined by

Q = m . c . ΔT

where Q is heat, m is mass, c is the specific heat constant and ΔT is the change in temperature.

The given parameters are

m = 17.27 g = 0.01727 kf

T1 = 92 ⁰C

T2 = 25.1 ⁰C

c = 900 J/kg⁰C

By substituting the given parameters, we can calculate the heat

Q = m . c . ΔT

Q = 0.01727 . 900 . (92 - 25.1)

Q = 1039.83 joule

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The mass of the object obtained is 1.32 g and the percent yield is  34.3%.

We know that the reaction equation shows the way the reactants are able to interact so as to obtain the products. We have that;

Number of moles of sodium sulfate = 0.196 M  * 57.9/1000 L

= 0.011 moles

Number of moles of magnesium chloride = 0.398 M * 167/1000 L

= 0.066 moles

Given that the reaction is 1:1, the limiting reactant is sodium sulfate

Then;

Mass of the magnesium sulfate produced = 0.011 moles * 120 g/mol

= 1.32 g

The percent yield of the magnesium sulfate = 0.453 g/ 1.32 g * 100/1

= 34.3%

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Answer:D

Explanation:plato

The true statement is: It took the car the same amount of time to travel the first 10 meters as it did to travel the last 10 meters (Option C)

The following data were obtained from the question:

Now, we shall determine the time taken to travel the first 10 m. This is shown below:

Next, we shall determin the time taken to travel the last 10 m. This is shown below:

From the above illlustration, we can see clearly that it took the car the same time to travel the first 10 m and the last 10 m.

Thus, the true statement is option C: It took the car the same amount of time to travel the first 10 meters as it did to travel the last 10 meters

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If a 28.00 gram sample containing 22.90 grams carbon and 5.10 grams hydrogen , then the empirical formula is CH3 .

The empirical formula, which is defined as the ratio of subscripts of the least whole number of the elements present in the formula, is the simplest formula for a compound. The simplest formula is another name for it.

The formula of a material expressed with the smallest integer subscript is referred to as an empirical formula for a compound.

The empirical formula provides details regarding the ratio of atom counts in the molecule. A compound's % composition directly determines its empirical formula.

Given ,

the mass of the sample of hydrogen and oxygen is 28g .

the mass of carbon in that sample is 22.9g

the mass of hydrogen in that sample is 5.1g

We know ,

the molecular mass of carbon is 12g

thus , 12g of carbon contains 1 mol

22.9g of carbon contains 22.9/12 = 1.9mol

the molecular mass of hydrogen is 1g

1g of hydrogen contains 1mol

5.1g of hydrogen contains 5.1mol

now , the mole ratio of carbon to hydrogen is

= C:H = 1.9/5.1 = 0.37 = 1:3

Hence , the empirical formula is CH3 .

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Answer:

Problems of Using Ionic and Covalent Compounds in Medicine

Stomach pain.

Nausea.

Vomiting.

Heartburn.

Gas.

Constipation.

Diarrhea.

Answer:

Problems of Using Ionic and Covalent Compounds in Medicine

Stomach pain.

Nausea.

Vomiting.

Heartburn.

Gas.

Constipation.

Diarrhea.

Answer:

A water turbine is used to convert the energy contained in water, potential energy or kinetic energy, into mechanical or electrical energy. There are two types of water turbines, the reaction water turbine, and the impulse water turbine.

Explanation:

Answer:

Water turbines are used to take energy whether it may be kinetic or potential from the water and convert that energy into mechanical, or electrical energy.

Explanation:

Answer: 1. Positive ions

2. They're called Cations

explanation: Cations are positive ions and anions are negative ions. Metals always form positive ions as they lose electrons to be like the Nobel gases - with full outer shells.



The importance of the following below in a nuclear reactor are:

This is referred to as the device which is used to start up and control a fission or fusion nuclear chain reaction or nuclear fusion reactions.

The control rod is responsible for the absorption of neutrons so that the nuclear chain reaction taking place within the reactor core can be slowed  or stopped. The containment structure help to prevent rays from getting into the environment thereby serving as a protective factor.

The moderator helps to slow down the speed of neutrons especially in those who have a very high speed thereby making it the correct choice.

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Answer:

the periodic table is the table of contents of the elements

Answer:

MnO

Explanation:

See the attachwed worksheet

To solve this questions we need to know the heterocyclic compounds and little bit about resonance. Therefore the nitrogen which is labelled 2 will react first with acid.

Heterocyclic compounds are those cyclic organic compounds that contains hetero atoms in place of carbon like N,S and O.

Pyrazole contains has structure just like pyrrole the Nitrogen which is labelled 1 that is NH act like nitrogen of pyrrole and the nitrogen that is labelled as 2 act like nitrogen of pyridine.

The electron of NH is involved in resonance, it is not free to give its electron to hydrogen ion from acid. So the nitrogen which is like nitrogen of pyridine will take hydrogen ion from acid first.

Therefore the nitrogen which is labelled 2 will react first with acid.

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Using the percentage by volume of the solutions given, we can calculate that we require 216 mL of 100% alcohol and 384 mL of 50% alcohol.

The percentages given refer to the percentage by volume (%V). We need to make 600 mL of 68% alcohol solution, by mixing a certain volume of 50% solution (A) and a certain volume of 100% alcohol (B). So, we know that:

A + B = 600 mL

We also know that the total volume of alcohol in the end solution needs to be:

0.68 * 600 mL = 408 mL

So, by extension:

0.50 * A + B = 408 mL

Based on the first equation, we can say that:

A = 600 mL - B

If we use that A in the second equation we get:

0.50 * (600 mL - B) + B = 408 mL

300 mL - 0.50 B + B = 408 mL

If we rearrange this equation we get:

B - 0.50 * B = 408 mL - 300 mL

0.50 * B = 108 mL

B = 108 mL / 0.50

B = 216 mL

A = 600 mL - 216 mL = 384 mL

So, we need 216 mL of 100% alcohol and 384 mL of 50% alcohol solution to get 600 mL of 68% alcohol solution.

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Answer:216 ml

Explanation: I got it right

The condensed form of Sb in order of increasing orbital energy is [Kr] 5s² 4d¹⁰ 5p³

Sb (Antimony) is a metalloid with atomic number 51. The electronic configuration of antimony is 1s² 2s²p⁶ 3s²p⁶d¹⁰ 4s²p⁶d¹⁰5s²p³

As you can see, the normal notation of electronic configuration is lengthy. Condensed or abbreviated form of the configuration would be preferred to normal lengthy electronic configuration for representation.

In condensed form, in place of completely filled subshells with configuration that is similar to noble gas is represented by the symbol of that particular inert gas / noble gas. The symbol would be represented inside square brackets.

The electronic configuration of Krypton, a noble gas is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶.

Therefore, Sb can be expressed in condensed form as [Kr] 5s² 4d¹⁰ 5p³. As observed, 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ in Sb is expressed as Kr followed by the remaining electronic configuration in Sb in order of increasing orbital energy.

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Answer:The yellow crystalline substance is a compound. The green gas and red powder are elements.

Explanation

Elements and compounds are considered pure substances. Elements are made up of a single type of atom while compounds are composed of two or more elements. One example of a compound is the table salt (NaCl) which is made up of one atom of sodium and one atom of chlorine. The elements in the compound are combined chemically and there is a definite ratio of these elements. They are formed by a chemical reaction where chemical bonds are formed. Furthermore, the components of the compound can be separated through several means such as extraction, distillation, etc. The process of heating the yellow crystalline substance resulted in the separation of its components namely, the green gas and red powder.

An atom's Lewis structure enables you to predict its bonding patterns and number of bonds. We may ultimately be able to comprehend the structures of molecules & their chemical characteristics using this information.

2. The stability of the molecule increases with the number of charges on each element. In order to reduce the number of different formal charges, a double or triple bond should be applied.

3. Dots are used in the Lewis structure to depict the shared electrons between atoms. Next, ascertain whether there is a single, triple, or triple covalent connection between the two atoms. Third, determine the radius of each of the bonded ions based on the type of bond by using an atom radius chart.

4. By considering each bond as if one-half of the electrons were allocated to each atom in a Lewis structure, formal charges can be ascribed to each atom. These fictitious formal charges serve as a reference for selecting the best Lewis structure.

5. N-O bond as well as a double bond. The N atom possesses a positive charge and an unpaired electron. They are the two principal resonance sources of NO2.

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According to the research, the correct option is d. Fernando is currently going through Detoxification process in which his body is cleared of drugs.

This is the treatment aimed at restoring the body's physiological homeostasis after it has been disturbed by the consumption of psychotropic substances as drugs.

In this sense, this process is carried out under the supervision of specialists in the treatment of addictive behaviors.

Therefore, we can conclude that Detoxification is a process of eliminating drugs or substances harmful to health to achieve physiological stability in the body.

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