look at the melting point for the metals in the fourth and fifth periods describe how the position of a metal within a period is related to irs melting point

A neutral atom of the isotope represented by ^79_35 Br contains protons, neutrons, and electrons:

protons=35

neutrons=44

electrons=34

Isotopes are two or more different atom types that have the same atomic number and position in the periodic table but different nucleon numbers due to the number of neutrons in their nuclei. Atoms that have different numbers of neutrons but the same number of protons are called isotopes. Despite having nearly identical chemical properties, their different masses have an impact on their physical characteristics. Atoms that belong to the same element and have the same atomic number Z but a different mass number A are known as isotopes. Carbon-12, carbon-13, and carbon-14 are three isotopes of the element with respective masses of 12, 13, and 14.

Here,

The number of protons = 35

The number of neutrons =79-35=44

The number of electrons = 35-1 =34

The protons, neutrons and electrons are there in a neutral atom of the isotope represented by ^79_35 Br:

protons=35

neutrons=44

electrons=34

To know more about isotope,

https://brainly.com/question/10757396

#SPJ4

The net ionic equation that occurs when zinc nitrate and lithium phosphate are mixed together in water is 3Zn2+ + 2PO43- ⟶ Zn3(PO4)2(s)

When zinc nitrate and lithium phosphate are combined in water, a precipitate of zinc phosphate is created. It is an insoluble white solid. The compounds that are directly engaged in the chemical reaction are the only ones that are shown in the net ionic equation. Two soluble ionic chemicals are involved in the double replacement reaction.

In an aqueous solution, zinc nitrate, Zn(NO3)2, fully dissociates into zinc cations, Zn2+, and nitrate anions, NO3-.

In an aqueous solution, lithium phosphate (Li3PO4) fully dissociates into lithium cations (Li+) and phosphate anions (PO4)3-.

3Zn2+ + 2PO43- ⟶ Zn3(PO4)2(s)

To learn more about zinc nitrate click here https://brainly.com/question/29355805

#SPJ4

It is untrue to make the second claim. Contrary to popular belief, alloys are not always superior electrical conductors than the individual metals that comprise them. Electrical conductivity is quite good in alloys.

Metal is used to construct a multitude of products due to its strength and durability. These are used to make things like autos, satellites, and kitchenware. Although the majority of metals are hard, some are not. At room temperature, mercury is a liquid metal, as opposed to sodium and potassium, which can be cut with a knife. The definition of an alloy states that it is a substance produced by mixing two or more metals. Alloys can also be produced using combinations of metal and other elements.

Learn more about Sodium here

https://brainly.com/question/29327783

#SPJ4

Answer: 4Al + 3O2 -> 2Al2O3

Explanation:

What I did was:

The product has 3 oxygens while the reactant has 2. So if you multiply the reactant by 3 and the product by 2 then the amount of oxygens on both sides will be equal (both sides have 6)

Then since there are now 4 Al on the product sides after multiplying by 2 for the oxygen (2 Al2 = 4 Al), there must be 4 Al on the reactants side.

Following is NOT the student's responsibility : schedule a retraining session on materials handling with the safety coordinator.

It is important to notify your instructor of the chemical spills immediately. You should immediately warn everyone that something has been spilled and  never touch, smell or in any other way interact with the chemical before you know what you are dealing with.

If you spill a large amount, make sure you evacuate the lab, and call the emergency personnel. It is important to have spill control and personal protective equipment appropriate for chemicals being handled readily available.

To know more about chemical spill, refer

https://brainly.com/question/29536510

#SPJ4

Note: the question given on portal is incomplete. here is the complete question.

Question: A lab student notified the TA of a SMALL hazardous chemical spill. Under the TA's guidance, the student used the spill kit materials to clean it. Which of the following is NOT the student's responsibility

a) prompt and proper clean-up.

b) to have spill control and personal protective equipment appropriate for the chemicals being handled readily available.

c)schedule a retraining session on materials handling with the safety coordinator.

d)Immediately report the spill to the appropriate emergency response office.

The pH of a 0.10 M solution of hypochlorous acid is approximately 3.7348.

The pH of an acid solution can be calculated using the relationship between the acid dissociation constant (KA) and the acid concentration (HA).

The acid dissociation constant (KA) of hypochlorous acid (HOCl) is 3.5 × 10^-8.

The acid dissociation equation for HOCl is:

HOCl + H2O <--> H3O+ + Cl-

So, the equilibrium constant expression is:

KA = [H3O+][Cl-] / [HOCl]

Given that the concentration of the acid is 0.1 M, we can use the following equation to calculate the hydronium ion concentration:

[H3O+]^2 = KA * [HOCl]

Plug in the value of KA and [HOCl]

[H3O+]^2 = (3.5*10^-8)(0.1)

[H3O+] = sqrt(3.510^-80.1)

[H3O+] = 1.87*10^-4

The pH of a solution is defined as the negative logarithm of the hydronium ion concentration

pH = - log[H3O+] = - log(1.87*10^-4) = 3.7348

So, the pH of a 0.10 M solution of hypochlorous acid is approximately 3.7348.

To learn more about problems with hypochlorous acid:

https://brainly.com/question/15243465

#SPJ4

The average rate of hydrogen fluoride generation, as determined by your response to Part B, is rate = 1.12 10(4) M/s.

corrosive due to the acid's H+ ions and poisonous due to the fluoride ions F-, which can penetrate deeply, chelate calcium and magnesium, and thus upset biological balances due to the destruction of the skin's or an eye's outermost layer.

Hydrofluoric acid, sometimes known as HF, is a weak acid. HF is a powerful corrosive, yet it isn't a strong acid. Since H and F have a very tight link, HF doesn't dissociate very much in water.

To know more about hydrogen fluoride visit:

https://brainly.com/question/27802323

#SPJ4

Your answers to Part B led you to the conclusion that the overall return of hydrogen fluoride creation is speed = 1.12 10(4) M/s.

Caustic because of the anticholinergic H+ ions and dangerous because of the fe(iii F-, which may penetrate profoundly, combine calcium and magnesium and alter biological balances by ruining the skin's or even an eye's outer layer.

The acid hydrofluoric acid, sometimes referred to as HF, is weak. Although HF is a potent acidic, it is not a strong acid. HF is does not disintegrate a great deal in water because H and E have an extremely strong bond.

To know more about hydrogen fluoride visit:

brainly.com/question/27802323

#SPJ4

The atoms in a Liquid have a definite volume, but move quickly enough to overcome the forces of attraction between them.

Learn more about Force of attraction refer to ;

https://brainly.com/question/3150088

#SPJ4

The solubility of M(OH)2 in a 0.202 M solution of M(NO3)2 is 1.98 x 10-4 mol/L.

For the second question, the molar solubility of lead thiocyanate in 0.600 M KSCN is 3.33 x 10-3 mol/L.

Calculate the ion product (Q) of the solution using the given Ksp:

Q = Ksp = 6.65 x 10-18

Calculate the concentration of M(OH)2 ions in the solution:

[M(OH)2] = √(Q/[M(NO3)2])

[M(OH)2] = √(6.65 x 10-18 / 0.202)

[M(OH)2] = 1.98 x 10-4 mol/L

For the second question, the molar solubility of lead thiocyanate in 0.600 M KSCN is 3.33 x 10-3 mol/L.

Calculate the ion product (Q) of the solution using the given Ksp:

Q = Ksp = 2.00 x 10-5

Calculate the concentration of Pb(SCN)2 ions in the solution:

[Pb(SCN)2] = √(Q/[KSCN])

[Pb(SCN)2] = √(2.00 x 10-5 / 0.600)

[Pb(SCN)2] = 3.33 x 10-3 mol/L

For more questions like Molar solubility click the link below:

https://brainly.com/question/28170449

#SPJ4

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 70.035 grams of fluorine gas can be produced from 3.50 moles of NaF.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

number of moles of molecule=given mass of molecule÷ molar mass of molecule

The balanced equation for the chemical reaction can be written as

NaF + H[tex]_2[/tex]SO[tex]_4[/tex] → NaHSO[tex]_4[/tex]+ F[tex]_2[/tex]

1 mole of NaF produce 1 mole of F[tex]_2[/tex].

3.50 moles =moles of NaF

3.50 moles =moles of F[tex]_2[/tex]

3.50 moles x 20.01 g/mol = 70.035 grams of fluorine gas

Therefore, 70.035 grams of fluorine gas can be produced from 3.50 moles of NaF.

To know more about mole, here:

https://brainly.com/question/15209553

#SPJ2

Among the given options, the molecules which are polar are :NO,SO₂ and XeF₄.All the other molecules are non-polar.

The polarity of a molecule depends on the distribution of electron density around the atoms. In general, a molecule is polar if the electron density is not symmetrically distributed around the central atom or if there is a difference in electronegativity between the atoms.

In Cl₂ the electron cloud is symmetrical and both Cl atoms have the same electronegativity. In CO₂ the central atom is carbon and it has two equal and opposite dipoles, which cancel each other out. In BF₃, the electron cloud is symmetrical. NO is polar because Nitrogen and Oxygen have a difference in electronegativity, hence the electron cloud is not symmetrical. SO₂ is polar because the Sulfur atom has a greater electron-withdrawing ability than the oxygen atoms. XeF₄ is polar because the electron cloud is not symmetrical and Xe has a greater electron-withdrawing ability than Fluorine.

To know more about polarity, visit:

https://brainly.com/question/2615067

#SPJ4

The chemistry behind monomer liquid and polymer powder nail enhancement is created by combining a chemical known as monomer liquid mixed with polymer powder to form a nail enhancement.

The monomer liquid will be combined with polymer powder to form the sculptured nail. The amount of monomer liquid and polymer powder used to create a bead is called the mix ratio. A mix ratio can be described as dry, medium, or wet. If twice as much liquid as powder is used to create the bead it is called a wet mix. The monomer is a moleculewhich binds to other molecules to form a polymer. This explain the monomer liquid.

To learn more about Monomer liquid please visit:

https://brainly.com/question/6548768

#SPJ4

Crystals are 3-dimensional arrays of positive and negative ions in a repeating pattern.

The symmetrical, three-dimensional structural configuration of points representing atoms, ions, or molecules that make up a crystalline material is known as the crystal lattice. It can be characterized as the spatial geometrical arrangement of the atoms, ions, or molecules that make up the crystalline solid. Three-dimensional shapes, or 3D shapes, are solid shapes with length, depth, and width. These are forms that take up room. This indicates that we can reach out and touch them. An "array of arrays" that stores data in tabular form is what is referred to as a multi-dimensional array.

To know more about crystal lattice click here

https://brainly.com/question/10281663

#SPJ4

A scientist uses an accelerator and high-energy electron to study the particle inside the proton of a helium atom. The particle, the client is studying, is the He quarks. The correct option is D.

Quarks are the most basic and fundamental constituents of matter. When high energy is shot into the helium nucleus to investigate the particles inside the proton, it is evident that the scientist is researching the quarks inside the proton. A proton contains two up quarks and one down quark.

When the photon particles of a helium atom are injected into a particle accelerator, scientists study the microscopic particles known as Helium quarks.

Therefore, the correct option is D. the He quarks

To learn more about quarks, refer to the link:

https://brainly.com/question/1444547

#SPJ1

The question is incomplete. Your most probably complete question is given below:

the He neutrons

the He nucleus

the He electrons

the He quarks

The reaction will be spontaneous value of ΔSuniv = -116 J/K

a) ΔSsurr = -ΔH∘rx/T  

ΔSsurr = -84 kJ/ 300 K = 0.28 kJ/K = 28.0 J/K

ΔSuniv = ΔSsyst + ΔSsurr

ΔSuniv = -144J/K + 28.0 J/K = -116 J/K

This will be spontaneous

b) ΔSssur = -84 kJ/ 751 K = 0.1118 kJ/K = 111.8 J/K

ΔSuniv = 144J/K + 111.8 J/K = 255.8 J/K

This is non-spontaneous

c) ΔSssur = - 84 kJ/ 300 K = - 28.0J/K

ΔSuniv = - 144J/K + (-28.0) J/K = - 172 J/K

This will be spontaneous

d) ΔSssur = +84 kJ/ 406 K = 0.2068 kJ/K = 206.8 J/K

ΔSuniv = 144J/K + 206.8 J/K = 350.8 J/K

This will be non-spontaneous

To know more about spontaneous here

https://brainly.com/question/5372689

#SPJ4

Describe your response in terms of a chemical equation that demonstrates how the anion functions as a base. HF (aq) OH- = F- (aq) H2O (l).

The reactant organisms are presented on the left handed side of a chemical equation, while the product objects are given on the right hand side. A empirical formula is a symbol of a chemical reaction that takes the shape of symbols and equations. such as CaCO3(s)CaO(s)+CO2 (g)

Formula Equation: Uses symbols or formulas to represent the products and reactants of a chemical reaction. The relative amounts of the reactants and products in the formula must be changed to ensure that the atom counts and types on both sides of the equation are equal.

To know more about chemical equation visit :

https://brainly.com/question/30087623

#SPJ4

Answer:

54.09

Explanation:

The pressure of the gas in the larger vessel when a 500.0 ml sample of gas at a pressure of 70.93 kPa is transferred to a 1050.0 ml vessel at a constant temperature is 33kPa.

Given the volume of sample gas (V1) = 500ml = 0.5L

The pressure of gas (P1) = 70.93kPa

The volume of vessel (V2) = 1050ml = 1.05L

The temperature is kept constant.

Then the pressure of the gas in the larger vessel =P2

We know that from Boyles law PV = nRT

As temperature is kept constant we can say that P1V1 = P2V2

Such that (70.93 x 10^3) x (0.5) = P2 x (1.05)

P2 = 33kPa

Hence the pressure of the gas in the larger vessel is 33kPa.

To learn more about Boyles law click here https://brainly.com/question/1437490

#SPJ4

Point A: This is the point where the pH corresponds to a solution of H2A in water. At this point, the solution is mainly composed of undissociated H2A molecules, so the pH of the solution is equal to the pKa1 of the acid.

Solution can be defined as a method for solving a problem, dispute, or difficult situation. It is a way to overcome obstacles and find a positive outcome.

b) Point B: This is the point where the pH corresponds to a solution of HA in water. At this point, the solution is mainly composed of partially dissociated HA molecules, so the pH of the solution is equal to the pKa1 of the acid.
c) Point C: This is the point where the pH corresponds to a solution of A in water. At this point, the solution is mainly composed of fully dissociated A molecules, so the pH of the solution is equal to the pKa2 of the acid.
d) Point D: This is the point where the pH corresponds to the pKa1 of the acid. At this point, the solution is in equilibrium between the undissociated H2A molecules and the partially dissociated HA molecules, so the pH of the solution is equal to the pKa1 of the acid.
e) Point E: This is the point where the pH corresponds to the pKa2 of the acid. At this point, the solution is in equilibrium between the partially dissociated HA molecules and the fully dissociated A molecules, so the pH of the solution is equal to the pKa2 of the acid. This point is reached when the total volume of titrant added is equal to the total volume of acid, which is usually equal to the second pKa of the acid times the volume of the acid.

To learn more about solution
https://brainly.com/question/28564792
#SPJ4

If the kinetic energy of the reactants was not enough to provide the needed activation energy then:

Reaction products would reform.
The rate of the response would probably quicken.
The products would develop in an energetically unstable condition.
The complex that had been activated would change into products.
A lower energy state would be used to generate the products.

What is the meant by activation energy?
The least amount of energy necessary to bring atoms or molecules into a state where they may undergo chemical transformation or physical transport is known as the activation energy in chemistry. The difference in energy content between atoms or molecules in an activated or transition-state configuration and the same atoms and molecules in their original configuration is known as the activation energy in transition-state theory.

To learn more about activation energy, click here: -

https://brainly.com/question/28384644

#SPJ4

The reactivity of a chemical is proportional to its atomic size. An experiment that attempts to correlate the size of an atom with its chemical reactivity.

We use chemistry frequently in our daily lives. The food we eat, the air we breathe, and the different cleaning products we use are just a few examples of how one can easily observe this branch of science in different spheres of human life. In fact, it is so prevalent that sometimes even human emotions are the result of chemical reactions within our bodies.

The four primary variables that influence the reaction rate are reactant concentration, the physical state of the reactants, surface area, temperature, and the presence of a catalyst.

Across a period, responsiveness declines as you move from left to right. Higher reactivity results from simpler electron transfer or removal as you move further to the left and down the periodic chart.

To know more about chemical reaction visit:

https://brainly.com/question/11231920

#SPJ4

Answer:

Explanation:

To calculate the enthalpy change for the reaction between zinc (Zn) and copper sulfate (CuSO4), we will use the method of calorimetry. This method involves measuring the heat absorbed or released by a reaction and using this information to calculate the enthalpy change of the reaction.

The method for calculating the enthalpy change for this reaction is as follows:

Obtain a calorimeter, such as a bomb calorimeter or a coffee cup calorimeter, and ensure that it is properly insulated to prevent heat loss.

Measure out a known volume of 1 M copper sulfate solution, and carefully add an excess of zinc powder to the solution. Be sure to measure the initial temperature of the solution before the reaction.

Start the reaction by mixing the zinc and copper sulfate together, and monitor the temperature of the solution as the reaction proceeds. Record the final temperature of the solution after the reaction has reached equilibrium.

Use the heat capacity of the calorimeter (Ccal) and the change in temperature (ΔT) to calculate the heat absorbed or released by the reaction. The heat absorbed or released by the reaction can be calculated using the formula: q = Ccal x ΔT

Once you have the heat absorbed or released by the reaction, you can use the molar enthalpy of the reaction (ΔH) to calculate the enthalpy change of the reaction. ΔH = q/ n

where n is the number of moles of Zn that reacted.

Repeat the experiment several times to confirm the results.

It's important to note that to get a precise result, the solution should be well mixed, the reaction should be carried out at constant pressure, and the heat loss should be minimized by using an insulated container.

Also, it's important to check the zinc powder and copper sulfate are not contaminated with other materials that could affect the result.

As a result, we can conclude that the heat transfer from the steam is 56400 J.

The enthalpy of vaporization, also known as the heat of vaporization or heat of evaporation, is the amount of energy required to transform a liquid substance into a gas. The enthalpy of vaporization depends on the pressure at which the transformation occurs. The heat of vaporization is defined as the amount of heat required to convert 1g of a liquid into a vapor without causing the liquid's temperature to rise. "The latent heat of vaporization is the amount of heat required to convert a unit mass of liquid substance into a gaseous phase at constant temperature conditions."

Here,

56400 J worth of heat are transferred from the steam.

Given information: M = 25.0 g, or 0.025 kg, is the mass of steam.

The steam's latent heat of vaporization is,

L=2.256*10^6 J/Kg

Q=m*L

Solving as,

Q=25*2.256*10^6

Q=56400 J

Thus, we can say that 56400 J of heat are transferred from the steam.

To know more about heat of vaporization,

https://brainly.com/question/20630647

#SPJ4

Green solid settles at the bottom of the test tube, while  the liquid has a green tint with a ring of green solid indicating it is partially miscible in water according to forces of attraction.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

Learn more about forces of attraction,here:

https://brainly.com/question/10957144

#SPJ1

Given only the chemical formula of a compound, it is difficult to determine the charge of the cation without additional information. However, there are several ways to infer the charge of cations.

Look for polyatomic ions.

Many cations are composed of metal ions and polyatomic ions. Polyatomic ions often exhibit a cationic charge. For example, if the chemical formula is NaNO3, the cation is Na+ because nitrate (NO3) is always -1.

Note the presence of transition metals:

transition metals can have multiple oxidation states, and the oxidation state can be inferred by the presence of other elements in the compound.

Look at the periodic table:

Some elements on the periodic table are the alkali metals (group 1), which are always +1, and the alkali metals, which are always +2.

However, it is important to note that even using these methods it can be difficult to determine the charge of the cation without additional information. In many cases, it is necessary to refer to references such as textbooks or chemistry databases to ascertain the load.

Learn more about the cation in

https://brainly.com/question/28710898

#SPJ4

The three naturally occurring amino acids that do not have exactly one chiral centre are Thr, Gly, Ile. Threonine is one of two proteinogenic amino acids with two stereogenic centres, the other being isoleucine, where Gly is the non-essential amino acid glycine is an inhibitory neurotransmitter. Ile refers to isoleucine amino acid.

What is meant by Amino acids?

Amino acids are what proteins are made of. Proteins are made up of lengthy strands of amino acids. Your body contains several different proteins, each of which serves important purposes. A protein's amino acid composition varies from one another. The sequence dictates how the protein will look and work in your body.

To Learn more about amino acids, click here: -

https://brainly.com/question/28409615

#SPJ4

The Dredging can be an effective technique in acquiring uranium is the correct option is b) False.

The dredging is removal of the sediments and the debris from the bottom of the lakes , the harbors, rivers and the other water bodies.  It is the routine of the water ways around worlds. It is because of the sedimentation. The sedimentation is the natural process of the sand and the slit washing away the downstream. It gradually fills the channels and the harbors.

Thus the dredging is the extraction of the material from the water environment. The dredging improves the water features.

To learn more about sedimentation here

https://brainly.com/question/9327614

#SPJ4

When two oxygen atoms bind together by having them share four electrons, each atom now has eight electrons available. This is because each oxygen atom starts off with six electrons in its outer shell, and when they share four electrons, each atom now has eight electrons available.

This type of bonding is known as a covalent bond, and is formed when two atoms share electrons to fill up their outer shells.

A covalent bond is formed when two atoms share electrons to fill up their outer shells. This type of bonding is very strong because the shared electrons are held by both atoms, allowing them to form a strong bond.

The shared electrons also help to stabilize the atoms, making them less likely to react with other atoms. Covalent bonds can be single, double, or triple bonds, depending on how many electrons are shared by the two atoms.

Learn more about covalent bond:

https://brainly.com/question/3447218

#SPJ4

Increase in the concentration of K+ ions causes the equilibrium to shift backwards and the concentration of K+ ions increases when potassium chloride is added to the red solution.

Increases with the addition of KSCN(aq) forward reactants include SCN-. systems move away from additions, therefore when there are more SCN- present, the system moves forward to restore balance. furthermore SCN-, Q, and K. Therefore, Q must rise to equal K in order to restore equilibrium.

a)The addition of excess potassium chloride (KCl) causes the equilibrium to shift to the left. This is because KCl is a common ion and it competes with Fe3+ for the SCN- ions, thus decreasing the [Fe(SCN)]2+ concentration.

b) The addition of potassium chloride causes the equilibrium to shift to the left because the chloride ions have a similar charge and radius to that of the SCN-, and compete with the SCN- ions for the Fe3+ ions. This means that the increased chloride ions would reduce the amount of [Fe(SCN)]2+ formed.

Learn more about equilibrium here:

brainly.com/question/14017610

#SPJ4

Common ion effect on a chemical system:

Fe3+ (aq) + SCN- (aq) => [Fe(SCN)]2+ (aq)

2. why did the addition of potassium thiocyanate cause the equilibrium to shift the way it did? (which ion caused this shift?)

3. a)which way did the equilibrium shift when excess potassium chloride was added to the test solution?

b) why did the addition of potassium chloride cause the equilibrium shift since neither potassium nor chloride ions are common ions to this equilibrium?

The pressure of air inside the balloon is 203 kPa. This is because the pressure of a gas is directly proportional to its volume.

Directly proportional is a mathematical term used to describe a linear relationship between two variables, where a change in one variable is directly reflected by a proportional change in the other variable. For example, if the number of hours a person works increases, the amount of money they earn will also increase proportionally. This linear relationship is also known as a "direct relationship" or a "direct variation".

Since you have halved the volume of the balloon, the pressure has doubled. The initial pressure of 101.5 kPa multiplied by 2 equals 203 kPa.

To learn more about directly proportional
https://brainly.com/question/28837405
#SPJ4