How many protons and electrons are present if an isotope has A=241 and n= 155? Identify the name of the element.

Answer:

- \(M=0.38M\)

- \(\\ \% m=3.67\%\)

Explanation:

Hello,

In this case, since the molar mass of potassium nitrate is 101.1 g/mol, we can compute the molarity as follows:

\(M=\frac{75.1g*\frac{1mol}{101.1g} }{1.95L} \\\\M=0.38M\)

Moreover, as the mass percent is computed as:

\(\% m=\frac{m_{KNO_3}}{m_{solution}} *100\%\)

Thus, by using the given density of the solution, we obtain:

\(\% m=\frac{75.1g}{1.95L*\frac{1000mL}{1L}*\frac{1.05g}{1mL} } *100\%\\\\ \% m=3.67\%\)

Regards.

Hypothesis: Increasing the cooling rate during the solidification of aluminum will result in a finer grain structure in the final solid.

When a liquid metal such as aluminum is cooled and solidified, the atoms in the liquid begin to arrange themselves into a crystalline structure. The rate at which this happens can have a significant effect on the final microstructure of the solid. If the cooling rate is slow, larger grains will form as the atoms have more time to move and arrange themselves into larger clusters. If the cooling rate is faster, there is less time for the atoms to move and larger clusters cannot form, resulting in a finer grain structure. Therefore, the hypothesis proposes that increasing the cooling rate during the solidification of aluminum will lead to a finer grain structure in the final solid. This hypothesis could be tested by varying the cooling rate during the solidification process and then examining the microstructure of the resulting solid.

Learn more about Hypothesis,

https://brainly.com/question/29519577

#SPJ1

Hypothesis: Increasing the cooling rate during the solidification of aluminium will result in a finer grain structure in the final solid.

The following methods can be used to demonstrate whether a solid is:

Ionic (NaCl):

Solubility test: Since NaCl is extremely soluble in water, its ionic nature can be verified by this fact.

Conductivity test: NaCl transmits electricity when it is molten or dissolved because it contains charged ions.

Metallic (Ca):

Conductivity test: Due to the existence of free electrons within their crystal structure, metals like calcium carry electricity.

Ductility and malleability test: Due to their malleability and ductility, metals are readily deformed when under pressure.

Covalent Network (Quartz, SiO2):

Hardness test: Because of the intense covalent bonds between atoms, covalent network solids like quartz are exceedingly hard.

Melting point test: Due to the powerful intermolecular forces between atoms, covalent network solids frequently have high melting and boiling points.

Polar Molecular (sugar, C6H12O6):

Solubility test: Sugar and other polar compounds can dissolve in polar solvents like water but cannot dissolve in nonpolar solvents.

Melting and boiling point test: Due to weaker intermolecular interactions, polar molecular solids have lower melting and boiling points than ionic or covalent network solids.

To know more about ionic, visit:

brainly.com/question/15241125

#SPJ1

The energy exists in many different forms. Each form of energy can be converted or changed into the other forms. The geothermal energy denotes the thermal energy.

The energy produced from the sun is called the solar energy. The heat and light which come from the sun is the solar energy. The solar energy play an important role in reducing the emissions of green house gases and also control the climate change.

The biomass is known as the fuel obtained from the organic matter waste of the living organisms such as plant waste, animal waste and municipal wastes. It is the fuel developed from plants.

The hydropower is the largest source of renewable energy which uses the moving water to produce electricity. The energy which is generated from the heat within the earth is called the Geothermal energy.

Thus,

Solar - sun's rays

Moving water - Hydropower

Plants - Biomass

Nuclear reactions - Geothermal

To know more about solar energy, visit;

https://brainly.com/question/29343234

#SPJ7

Compression happens when molecules are forced, or pressed, together. Rarefaction is just the opposite, it occurs when molecules are given extra space and allowed to expand.

In a longitudinal wave, the compression zone is where the particles are closest to one another. In a longitudinal wave, a rarefaction occurs where the particles are the furthest distant from one another.

Compression refers to the area where the medium is compressed, and rarefaction refers to the area where the medium is spread out.

Compression happens when molecules are forced, or pressed, together. Rarefaction is just the opposite, it occurs when molecules are given extra space and allowed to expand.

Learn more about compression, here:

https://brainly.com/question/1326823

#SPJ1

If the density of mercury is 13.6 g/mL, the volume of a 155-gram sample of mercury is 11.397 mL.

It follows that:

Mercury has a density of 13.6 g/mL.

155 grammes make to the mercury's weight.

The fact is,

A three-dimensional space enclosed by an object or thing is referred to as its volume.

Mass times volume equals density.

13.6 = Volume 155

quantity = 155/13.6

11.397 mL is the capacity.

As a result, assuming mercury has a density of 13.6 g/mL, a 155-gram sample of mercury has a volume of 11.397 mL.

The complete question is:

The density of mercury is 13.6 g/mL. What is the volume of a 155-gram sample of mercury?

To learn more about volume, refer to:

https://brainly.com/question/27100414

The molecular formula of p-dichlorobenzene is C6H4Cl2.

The simplest whole-number ratio of the atoms in a compound is an empirical formula. In other words, it shows the relative number of atoms of each element in a compound, but not the actual number of atoms or the molecular structure. Empirical formulas are often determined by experimental data, such as the mass percentages of each element in the compound, and they are useful for comparing the compositions of different compounds.

The molar mass of the empirical formula can be calculated as follows:

C3H2Cl:

3C = 3 x 12.01 g/mol = 36.03 g/mol

2H = 2 x 1.01 g/mol = 2.02 g/mol

1Cl = 1 x 35.45 g/mol = 35.45 g/mol

Total molar mass = 73.50 g/mol

Now we can calculate the molecular formula by dividing the molar mass of the compound by the molar mass of the empirical formula, and then multiplying each subscript in the empirical formula by this number:

Molecular mass / empirical mass = 147 / 73.50 = 2

C3H2Cl x 2 = C6H4Cl2

To know more about experimental data, visit:

https://brainly.com/question/8828700

#SPJ1

(ノ☉｡☉)ノ (ノ☉｡☉)ノ (ノ☉｡☉)ノ (ノ☉｡☉)ノ

it's in order and the answer is also there, just read it thanks ☜(^o^☜()

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:

Answer:

.

Explanation:

.

The ratio of ions in the given ionic compound, 2 Na₃PO₄ is 6 : 2.

Ions are substances formed when atoms of elements gain or lose or lose electrons.

In some instances, the group of atoms may come together and react as one unit and these are called radicals.

Ionic compounds are formed when two oppositely charged ions are held together by electrostatic forces of attraction.

The ions in the given ionic compound, 2 moles of Na₃PO₄, are as follows;

2 * 3 moles of Na⁺ = 6 moles

2 * 1 mole of PO₄ = 2 moles

The ratio of ions = 6 : 2

The ratio of ions = 3 : 1

Learn more about ions at: https://brainly.com/question/2687188

#SPJ1

Answer:

i forgot sorry lol

Explanation:

oops

Answer:

There are three methods of thermal energy transfer: conduction, convection, and radiation. Conduction transfers thermal energy through direct contact.

Explanation:

I know this

The diagram shows a picture of a compound.

A compound is a substance that is made up of two or more different elements that are chemically bonded together in a specific ratio.

This means that the elements are combined in a way that creates a new substance with different physical and chemical properties than the individual elements.

Compounds can be formed through a variety of chemical reactions, such as combining elements through a chemical bond or through a reaction between an acid and a base.

So for the given diagram, we can see that it represents two or more elements chemically combined.

Learn more about a compound here: https://brainly.com/question/29108029

#SPJ1

3. Proton is the subatomic particle which accounts for most of an atom's mass.

4. Electrons are the subatomic particle which accounts for most of atoms volume.

Explanation:

subtract it into 273.15to convert it in to celcius

Active transport requires energy to transport the molecules across the cell membrane. Thus, Option A is correct.

Active transport is the transport of molecules from a lower concentration to a higher concentration across the cell (plasma) membrane. As this process is against the concentration gradient, it requires cellular energy to transport the molecules or ions. Active transport involves Primary active transport and secondary active transport.

Passive transport involves the movement of molecules from a higher to lower concentration gradient and thus does not require energy and is slower than active transport.

Therefore, only active transport requires energy for the transportation of molecules across the cell membrane.

To learn more about active transport,

brainly.com/question/12133248

Half a mole of O2 will remain after combining one mole of H2 and one mole of O2. Set up the hydrogen to water conversion factor at this time. 2.5 moles of 2 H2O/ 2 H2 Theoretically, H2 is created from 3.5 moles of H2O.

Worrisome moles, on the contrary hand, are asymmetrical, which means that when split in half, both of them sides do not appear the same. Normally, the border of benign moles is uniformly circular.

Why moles suddenly emerge in adulthood is unknown to researchers. The majority of these benign conditions are brought on by aging, prescription drug usage, sun exposure, sunburn, and genetic abnormalities.

To know more about Moles visit:

https://brainly.com/question/20486415

#SPJ1

Answer:

1. The partial pressure of Br₂ is 0.118951 atm 2) The value of Kp is 2.843 × 10².

Explanation:

1. The reaction at equilibrium will be:

2NOBr (g) ⇒ 2NO (g) + Br₂ (g)

The partial pressure of PNOBr is 0.363 atm, the partial pressure of NO is 0.421 atm, there is a need to find the partial pressure of Br₂, the value of Kp is 0.160. For the given reaction,

Kp = [PNO]² × [PBr₂] / [PNOBr]²

0.160 = [0.421]² × [PBr₂] / [0.363]²

0.160 = [0.177241 × [PBr₂] / 0.131769

[PBr₂] = 0.131769 × 0.160 / 0.177241

[PBr₂] = 0.118951 atm

The partial pressure of Br₂ is 0.118951 atm.

2) The reaction will be,

2NH₃ ⇔ N2 (g) + 3H₂ (g)

Kp is the equilibrium constant, and its value will be,

Kp = [PN₂] × [PH₂]³ / [PNH₃]² ------------------(i)

Considering the reactants in terms of molarity will be,

Kp = [N2] × [H₂]³ / [NH₃]²

Here, [N2] = 0.297 / 16.6 = 0.017892 M

[H₂] = 0.320/16.6 = 0.019277 M

[NH₃] = 3.53 × 10⁻⁴ / 16.6 = 2.12651 × 10⁻⁵ M

Now putting the values in equation (i) we get,

Kp = [0.017892] × [7.16399 × 10⁻⁶] / [4.52204 × 10⁻¹⁰]

Kp = 0.128167 × 10⁻⁶ / 4.52204 × 10⁻¹⁰

Kp = 2.8343 × 10²

Hence, the equilibrium constant is 2.8343 × 10²

They appear as the trait over a recessive allele. Statement C) is true about the dominant alleles.

Dominant alleles are genetic variants that, when present in an individual's genotype, are expressed phenotypically, meaning they determine the visible or observable traits. Dominant alleles are represented by capital letters, while recessive alleles are represented by lowercase letters in genetics.

In terms of inheritance, if an individual has at least one copy of the dominant allele, it will be expressed in the phenotype, regardless of the presence of a recessive allele. This is because dominant alleles exert their influence over recessive alleles, thus "dominating" their expression.

To illustrate this, let's consider a specific example using a trait controlled by a single gene with two possible alleles: dominant (A) and recessive (a). If an individual is homozygous dominant (AA), meaning they possess two copies of the dominant allele, the dominant trait will be expressed.

However, if an individual is homozygous recessive (aa), with two copies of the recessive allele, the recessive trait will be expressed since there are no dominant alleles to override it.

Therefore, dominant alleles appear as the trait over recessive alleles, regardless of the presence or absence of a recessive allele. The presence of even a single copy of the dominant allele is sufficient for its expression in the phenotype. Option C

For more such questions on  recessive allele visit:

https://brainly.com/question/16048928

#SPJ8

Answer:

Solid state : In this state, the molecules are arranged in regular and repeating pattern. The molecules are closely packed that means they are fixed and vibrate in place but they can not move from one place to another.  They have least kinetic energy.  For example : chair

Liquid state : In this state, the molecules are present in random and irregular pattern. The molecules are closely packed but they can move from one place to another.  They have more kinetic energy than solids but less than that of gases. For example : oil

Gaseous state : In this state, the molecules are present in irregular pattern. The molecules are not closely packed and they can move freely from one place to another and spread out.  They have most kinetic energy. For example : Hydrogen

Solids, liquids and gas are those substances that have the most common types of bonds and they accept the phases of matter.

Learn more abut the three most commonly accepted phases.

brainly.com/question/16784307.

The heat required to raise the temperature of 0.5 g of water from 20°C to a final temperature of 50°C is 62.7 J.

The heat required to raise the temperature of 0.5 g of water from 20°C to a final temperature of 50°C is calculated using the equation below as follows:

q = mcΔT equation:

where;

Assuming the initial temperature of the water is 20°C, and the final temperature is 50°C, the heat required will be:

q = (0.5 g) x (4.18 J/g°C) x (50°C - 20°C)

q = (0.5 g) x (4.18 J/g°C) x (30°C)

q = 62.7 J

Learn more about the specific heat of water at: https://brainly.com/question/26846829

#SPJ1

Answer:

Fluorine (F)

Explanation:

The poorest conductor of electricity from the given choices is fluorine. This is because fluorine is a non - metal.

Like other non - metals, fluorine does not conduct electricity.

Only metals are known to conduct electricity and heat readily.

Semi - metals like silicon will conduct electricity under specific condition.

The free mobile electrons in metals makes it easy for them propagate electricity

Answer:

Explanation:

According to Boyles' law, the volume of a given mass of gas is inversely proportional to its pressure

Mathematically:

Where:

P1 is the initial pressure which is 28.2 atm

V1 is the volume of the cylinder which is:

We convert V1 to liters by multiplying by 0.001 L

That would be:

P2 is the atmospheric pressure which is 1 atm

Substituting the values, we have:

To prepare a 0.12 M solution of FeCl₃, the amount of solid FeCl₃ to be dissolved in a given volume of solvent will be 9.72 grams.

Given,

Molarity of FeCl₃ (M)= 0.12 M

The molecular weight (m) of FeCl₃ is  = 162 gm

The volume of the solution (V) to be prepared is =500 ml

The amount of FeCl₃ to be dissolved to make a 0.12 M solution is= x

So,

MV= x ÷ m × 1000

0.12× 500 = x ÷ 162 × 1000

x = 60 × 162 ÷ 1000

x= 9.72 gm

So 9.72 grams of FeCl₃ is dissolved to make 500 ml of 0.12 M solution.

For preparing 0.4 M HCl from 4M HCL:

If we need to make 500 ml of solution with 0.4M of HCL, then we use the formula:

M₁V₁= M₂V₂

0.4 × 500= 4 × x

x= 50 ml

So 50 ml of 4M HCL is taken to make 0.4 M HCL.

To learn more about FeCl₃, refer to the link:

https://brainly.com/question/32098087

#SPJ1

The ph value of human saliva is between 6.2-7.6 with 6.7 being the average pH

ph value of human saliva is 7 and 6

The result of the Heat Transfer experiment is given as follows:  "The molecule was increased in kinetic energy but in a random structure." (Option B)

Heat transfer is a thermal engineering subject that deals with the creation, consumption, conversion, and exchange of thermal energy across physical systems.

Heat transmission is categorized into several methods, including thermal conduction, thermal convection, thermal radiation, and energy transfer via phase shifts.

At 3 p.m., the water temperature is raised. The average kinetic energy of an item is related to its temperature. As a result, as temperature rises, so does average kinetic energy.

Kinetic energy is created by the random movement of molecules. Hence, the correct answer is "The molecule was increased in kinetic energy but in a random structure."

Learn more about Heat Transfer:
https://brainly.com/question/13433948

#SPJ1

Full Question:

A student investigated heat transfer using a bottle of water. The student placed the bottle in a room at  20.50C. The student measured the temperature of the water in the bottle at 7 a.m. and again at 3 p.m.  The data from the investigation are shown in the table below.

[See attached image]

Question:How would you describe the average kinetic energy of the water molecules in the bottle at 7 a.m. to  the average kinetic energy of the water molecules in the bottle at 3 p.m.